JP2001252786A - Wire for welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire for welding, by which satisfactory and stable feeding property of the wire can be kept even when a load is applied to the wire when welding by using a long-sized conduit cable in a complex path. SOLUTION: Projecting and recessing parts along a peripheral direction are formed on a peripheral surface. The number of the projecting parts by these projecting and recessing parts, is three to twelve pieces per the whole length of the outer periphery of the wire in a cross-section perpendicular in the longitudinal direction of the wire 1, and a difference in elevation of the projecting and recessing parts is 4 to 20 μm. At least one kind of coating, which is selected from a group consisting of MoS2, WS2, C and teflon (registered trademark), is applied to the surface of the wire 1 by 0.01 to 1 g per 10 kg of the wire in a total quantity. Further at least one variety of oil, which is selected from a group consisting of vegetable oil, animal oil, mineral oil and synthetic oil, is (are) applied to the surface of the wire by 0.5 to 3 g per 10 kg of the wire in a total quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding wire such as a plated or unplated solid wire or a flux-cored wire used for automatic welding or semi-automatic welding, and more particularly to the use of a long conduit cable having a complicated path. The present invention relates to a welding wire capable of maintaining good and stable feedability when welding by welding.

[0002]

2. Description of the Related Art Generally, a welding wire is a thin wire having a diameter of 0.8 to 2.0 mm and a solid wire whose entire cross section is metal, and a flux-cored wire in which a flux is covered with a metal sheath. There is. FIG. 6 is a schematic diagram showing the wire feeding device. In the wire feeder,
A pair of feed rollers 2 for inserting the wire 1 through the conduit cable 3 is disposed at one end of the conduit cable 3. A welding torch 4 is connected to the other end of the conduit cable 3, and the welding torch 4 is provided with a contact tip 5 (current-carrying part). Inside the conduit cable 3 is provided a tubular body including a flexible tube formed in a spiral shape (hereinafter referred to as a conduit tube).

As shown in FIG. 6, the above-mentioned welding wire is inserted into a conduit tube provided inside a conduit cable 3 by a feed roller 2 of a wire supply device (not shown) used at the time of welding. Long (6
m or more) from the conduit tip 3 of the conduit cable 3 and the contact tip 5 of the welding torch 4 connected thereto.
Is used for arc welding in a shield gas atmosphere while sending out the gas.

At the time of welding, a long conduit cable 3 is adjusted to a distance from a welding power source to a welding site.
It is often used by adjusting its length by bending it up, down, left and right or wrapping it in a loop. Further, in a narrow welding site, the conduit cable 3 is often used in an S-shape or a J-shape. In this case, when the conduit cable 3 is bent, the contact friction between the wire 1 passing through the inside and the inner surface of the conduit tube 3 increases, so that the feeding resistance increases and the wire 1 can be fed smoothly. There is a problem that it becomes difficult.

[0005] Further, with the automation of welding and the lengthening of the feeding path, it has become increasingly necessary to improve the wire feeding property. Various techniques have been proposed to solve some of the conventional problems (JP-A-8-1370, JP-A-8-99188 and JP-A-10-2).
No. 49576).

Japanese Patent Application Laid-Open No. 8-1370 discloses that a projection height H is 0.5 to 8 μm on the surface of a wire and the distribution of the projections constituting the projection is an average distance between centers in a direction perpendicular to the drawing direction. A welding wire in which microprojections are formed such that Smc ≦ 100 μm and an average center-to-center distance Sml ≦ 200 μm in the length direction of the drawn wire is described.

Japanese Unexamined Patent Application Publication No. 8-99188 discloses that a concave portion having a depth of 1 to 40 μm is provided on a surface of a wire,
It describes a welding steel wire with an area of 0.0010 mm ^{2 to} 0.0250 mm ² occupying 15 to 65% of the surface of the wire and having longitudinal grooves in the longitudinal direction of the wire.

Japanese Patent Application Laid-Open No. Hei 10-249576 discloses that when a wire of a gas shielded arc welding wire is drawn with a plurality of sets of cassette roller dies and hole dies, at least one set of cassette type roller dies is used. The surface of the wire is made uneven so that the surface roughness Ra of the wire is 0.3 to 2
A method for producing a gas-shielded arc welding wire having a diameter of μm is described.

[0009]

However, any of the above-mentioned prior arts (JP-A-8-1370, JP-A-8-9)
9188 and JP-A-10-249576)
Also, since the irregularities on the surface of the wire are small, friction in the conduit cable is reduced, and stable feeding performance is achieved.
There is a problem that it is not possible to secure a sufficient amount of adhesion of a lubricating oil, a coating agent, and the like for ensuring electrical conductivity of the wire in the contact tip portion.

In addition, applying a special shape to the surface of a roller used for processing the above-mentioned welding wire has a problem in that the shape of the roller and the manufacturing cost of the roller are burdensome. is there.

The present invention has been made in view of such a problem, and when welding is performed using a long conduit cable having a complicated path, good and stable operation can be performed even when a load is applied to the wire. An object of the present invention is to provide a welding wire that can maintain wire feeding properties.

[0012]

In a welding wire according to the present invention, irregularities are formed on a peripheral surface along a circumferential direction, and the number of convex portions formed by the irregularities is a cross section perpendicular to the longitudinal direction of the wire. It is characterized in that the number is 3 to 12 per the whole length of the outer periphery of the wire, and the height difference of the unevenness is 4 to 20 μm.
In the present invention, peaks and valleys are alternately formed in the circumferential direction due to irregularities on the peripheral surface of the wire.

In this case, MoS ₂ ,
At least one selected from the group consisting of WS ₂ , C and Teflon has a total amount of 0.01 per 10 kg of wire.
It is preferable that 1 g to 1 g is applied.

Further, at least one or more oils selected from the group consisting of vegetable oils, animal oils, mineral oils and synthetic oils are present on the surface of the wire in a total amount of 0.5 to 10 kg per wire.
It is preferable that 3 to 3 g is applied.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION As a result of intensive experiments and studies on the surface condition of a wire in order to solve the above-mentioned problems, the present inventors have found that the outer peripheral shape in a cross section perpendicular to the longitudinal direction of the wire is not a perfect circle, but a high or low. By forming large irregularities having a difference of 4 to 20 μm so that the number of convexes is 3 to 12 per circumference, a liquid lubricant, a solid lubricant or a liquid lubricant is formed on the irregularities formed on the surface of the wire. It has been found that the mixture with the solid lubricant adheres, the friction between the wire and the conduit liner can be reduced, and the feed resistance of the wire can be reduced. In addition, since the electrical conductivity of the wires in the contact chip portion can be ensured, fusion at the contact chip can be prevented. As a result, stable feeding of the welding wire can be performed. It is considered that this is because even after the wire passes through the conduit cable, the lubricant or the like applied to the surface of the wire remains on the irregularities, and the retention property of the liquid lubricant or the solid lubricant is improved.

FIG. 1 is a graph showing the irregular shape of the outer peripheral surface of a wire in a cross section perpendicular to the longitudinal direction, with the horizontal axis indicating the position in the wire circumferential direction (center angle) and the vertical axis indicating the wire radius. In the present invention, the unevenness formed on the surface of the wire is not an unevenness having a height of about 0.1 to 3 μm, but a periodic change in the wire radius that is larger than the average wire radius. In this case, three projections are formed on the surface of the wire by unevenness, and the height difference of the unevenness is 4 to 20 μm.

Hereinafter, a method of manufacturing a welding wire according to an embodiment of the present invention will be described. As a wire drawing method for forming irregularities along the circumferential direction on the surface of the wire, a method of performing a final skin pass by a cassette roller die, a method of performing a final skin pass by a micromill, and a hole die having a concave and convex There is a way to do it.
The welding wire of the present embodiment is one in which irregularities are formed on the surface of the wire by a method of performing a final skin pass with a cassette roller die. FIG. 2 is a schematic diagram showing a production line for a welding wire.

In the wire manufacturing line used in this embodiment, as shown in FIG. 2, a payoff stand 6 around which the wire 30 is wound in a coil shape is provided.
A plurality of cassette roller dies 7 and wire drawing machines 8 are arranged adjacent to the pay-off stand 6 in pairs. The wire drawing machine 8 is provided below the cassette roller dies 7. An oil application device 9 is arranged on the lower side of the pair of the last-stage cassette roller die 7 and wire drawing machine 8 with the roller 22 interposed therebetween. Further, a winding machine 10 for winding the wire 30 is disposed below the oil application device 9. In addition,
A roller 23 is provided between any of the devices, whereby the wire 30 is guided.

In this embodiment, the payoff stand 6
The wire 30 wound in a coil shape is fed out to a continuous drawing line while being unwound. The fed wire 30 is sequentially drawn by a cassette roller die 7 and a wire drawing machine 8 set to a predetermined area reduction rate. In this manner, the cassette roller die 7 forms three to twelve irregularities having a height difference of 4 to 20 μm on the outer periphery in the number of projecting portions around the entire circumference of the wire. After the wire is drawn, the wire 30 is applied with an appropriate amount of predetermined oil by the oil application device 9 and the winding machine 10
Is wound up. In this way, a wire is manufactured. In the present invention, the area reduction rate is a value obtained by the following mathematical formula 1.

[0020]

## EQU1 ## Reduction area = {1− (wire cross-sectional area after processing / wire cross-sectional area before processing)} × 100

FIG. 3 is a schematic diagram showing drawing of a wire rod by a cassette roller die. In the present invention, the drawing by the cassette roller dies 7 means that a plurality of cassette roller dies 7 composed of a pair of grooved rollers 11 are alternately arranged by 90 ° with the wire 30 to be drawn interposed therebetween, and a predetermined reduction is performed. This is to draw according to the area ratio. Further, in order to increase the number of irregularities on the surface of the wire 1, the number of roller dies 7 may be increased. The size of the unevenness on the surface of the wire 1 is adjusted by adjusting the distance between each pair of grooved rollers 11 in the final drawing step, and the final difference in the height of the unevenness of the wire is 4 to 20 μm. Adjusted to be within range.

Hereinafter, the reasons for limiting the numerical values of the welding wire of the present invention will be described in detail.

Number of protrusions per wire whole circumference: 3 to 12
The unevenness formed along the circumferential direction on the outer periphery of the individual wire reduces friction between the surface of the wire and the inner surface of the conduit cable. In addition, the unevenness of the wire can hold oil or a solvent. If the number of protrusions per circumference of the wire is less than three, the oil or the solvent cannot be sufficiently held on the unevenness of the wire, so that the feeding resistance cannot be reduced.
On the other hand, if the number of protrusions exceeds 12, the effect of reducing the feed resistance is reduced, and the feed resistance is not much different from that of a perfectly round wire.

Unevenness: 4 to 20 μm If the unevenness exceeds 20 μm, winding irregularities occur when the wire is wound around the spool. Further, in the present invention, when the plating is formed on the surface of the wire, the height difference of the unevenness is the height difference of the unevenness on the plating surface. On the other hand, if the height difference between the irregularities is less than 4 μm, a sufficient amount of lubricant cannot be held.

Consists of MoS ₂ , WS ₂ , C and Teflon
At least one selected from the group: wire 1 in total amount
0.01 to 1 g MoS ₂ per 0 kg acts as a lubricant for improving the slip property of the wire in the conduit tube. WS ₂ , C and Teflon also have a function of improving the feedability as a lubricant. Therefore, in the present invention, MoS ₂ , W
More preferably, at least one or more of S ₂ , C and Teflon are applied to the surface of the wire. These are, for example, MoS _{2 on} the surface of the wire on which the irregularities are formed.
Or the like can be attached to the wire by spraying or applying a dispersion (water or oil system).
In addition, MoS ₂ or the like may mix these with a wire drawing lubricant to wire-draw and attach the wire to the wire surface.

If the total amount of at least one of MoS ₂ , WS ₂ , C and Teflon is 0.01 to 1 g per 10 kg of wire, the feedability at the time of welding using a long conduit tube is remarkably improved. Can be done. On the other hand, at least one of MoS ₂ , WS ₂ , C, and Teflon has a total amount of 0.01 per 10 kg of wire.
When it is less than g, the lubricant is not sufficiently coated in the conduit tube, and the wire feedability is hardly improved. Further, when at least one of MoS ₂ , WS ₂ , C and Teflon exceeds 1 g per 10 kg of wire in total, the amount of spatters generated is remarkably increased, and welding workability tends to deteriorate. Therefore, in consideration of feedability, electrical conductivity, appearance, and the like, it is desirable that the total amount of one or more selected from the group consisting of MoS ₂ , WS ₂ , C, and Teflon is 0.01 to 1 g per 10 kg of wire. .

[0027] Vegetable oils, animal oils, mineral oils and synthetic oils.
At least one selected from the group consisting of:
More preferably , at least one selected from the group consisting of 0.5 to 3 g of vegetable oil, animal oil, mineral oil and synthetic oil per 10 kg is applied to the wire surface. When the total amount of at least one selected from the group consisting of vegetable oil, animal oil, mineral oil and synthetic oil is 0.5 to 3 g per 10 kg of wire, the feeding resistance is further reduced and the feeding property is further improved. Is done. At least one selected from the group consisting of vegetable oils, animal oils, mineral oils and synthetic oils has a total amount of wire 10 k
If it is less than 0.5 g per g, the effect of reducing the feeding resistance will be small. On the other hand, when the total amount of at least one or more selected from the group consisting of vegetable oil, animal oil, mineral oil and synthetic oil exceeds 3 g per 10 kg of wire, these oils are likely to be clogged in the spring liner by welding for a long time.

Hereinafter, a method for measuring the above-described parameters will be described.

A method for measuring the surface shape of a wire will be described. Roundness meter (RONDCOM30B) manufactured by Tokyo Seimitsu Co., Ltd.
Use First, the lubricant adhering to the surface of the wire is removed with an organic solvent such as acetone or petroleum ether.
Then, the surface shape of the wire is measured by a roundness meter.
FIG. 4 is a schematic diagram showing the roundness of a cross section perpendicular to the longitudinal direction of the wire. The measurement principle of the roundness meter is that a circle in which the least square sum of the deviation is the smallest with respect to the shape obtained by the detector of the measuring device in contact with the surface of the wire is defined as a virtual perfect circle 21. Calculate the deviation of the surface of the welding wire based on the
This is a method for analyzing the surface shape of a welding wire. Thereby, the surface shape 20 of the wire is measured.

Next, an oil amount analysis method will be described. Before the measurement, the wire is cut into 10 to 20 mm to prepare a 20 g wire. Next, the wire is immersed in 40 ml of carbon tetrachloride to extract oil adhering to the surface of the wire. next,
This aqueous solution of carbon tetrachloride is filtered with a filter, and RIGAK
The oil extracted using an oil content analyzer (Oil-20) manufactured by U Company is quantitatively analyzed by an infrared absorption method, and the oil content is measured. Based on the oil concentration, the amount of oil adhering per 10 kg of the wire is calculated. As a standard for the amount of oil, a solution obtained by dissolving palm oil having a melting point of 25 to 35 ° C. in a predetermined concentration of carbon tetrachloride and measuring the solution by an infrared absorption method is used.

Next, extreme pressure additives (graphite, MoS ₂ , WS ₂
And Teflon) will be described. First, a method for measuring the amount of graphite applied will be described. First, the wire is washed with an organic solvent (such as ethanol, acetone or petroleum ether). After the washing solution is filtered through a glass filter, the glass filter is dried. Then, the amount of carbon of the collected graphite is measured while keeping the glass filter as it is. This measured amount is defined as (a).

On the other hand, after washing 10 g of the wire with ethanol, the wire was mixed with concentrated nitric acid and water at a mixing ratio of 1: 2.
It is immersed in a nitric acid solution (volume ratio) of 200 ml for 120 seconds to dissolve only the surface of the wire, and the solution is filtered with a glass filter. Thereafter, the glass filter is dried. Then, the amount of carbon of the collected graphite is measured while keeping the glass filter as it is. This measured amount is defined as (b).

The carbon content of each glass filter used in each of the above-described steps is measured before measurement, and this is set as a blank value (c1, c2) and subtracted from each measured value. Thereby, the amount of only the graphite existing on the surface of the wire is measured. Note that carbon dissolved in the wire is not collected by the filter but is dissolved in the filtrate. That is, only the free graphite adhered to the surface of the wire or embedded immediately below the surface of the wire is collected by the filter. Therefore, the total amount (D) of the graphite adhered to the surface of the wire or embedded immediately below the surface can be calculated by the following equation (2).

[0034]

(D) = ((a) + (b)) − ((c1) + (c2))

By dividing the total amount (D) of the graphite by the mass of the wire, the amount of graphite applied per 10 kg of the wire can be calculated.

Next, a method for measuring the amount of MoS ₂ will be described. First, after sampling 50 g of the wire, 3
The wire is cut to a length of 0 mm, and the oil and the like adhering to the wire surface are stirred and washed in ethanol. Next, 50 g of the wire from which oils and fats attached to the surface were removed were put into 50 cm ^{3 of} hydrochloric acid having a mixing ratio of concentrated hydrochloric acid and water of 1: 1 (volume ratio), and left for 1 minute to form a concave portion. M embedded in
oS ₂ is stripped from the wire surface. Next, water is added to hydrochloric acid to make the total amount 100 cm ^3, and then the hydrochloric acid solution in which MoS ₂ is dispersed is filtered through filter paper. Thereafter, sulfuric acid 10 cm ^{3 in} which the mixing ratio of concentrated sulfuric acid and water is 1: 1 (volume ratio).
When the filter paper was added to a mixed solution of perchloric acid 5 cm ³ and nitric 20 cm ^3, to dissolve MoS ₂ deposited on filter paper by white smoke treatment. Then, water was added to the mixture to reduce the total amount to 10%.
After adjusting to 0 cm ³ , salt is dissolved. Then, the amount of Mo in the dissolved acid solution is measured by an ICP method (dielectric coupling plasma method) to quantify the amount of Mo. By converting this measured amount to MoS ₂ and dividing by the mass of the wire, the wire 10
The application amount of MoS ₂ per kg can be calculated.

Next, a method for measuring the amount of WS ₂ will be described. First, after sampling 50 g of the wire, 30
The wire is cut to a length of mm, and the oil and the like adhering to the wire surface are stirred and washed in ethanol. Next, 50 g of the wire from which oils and fats attached to the surface were removed were put into 50 cm ^{3 of} hydrochloric acid having a mixing ratio of concentrated hydrochloric acid and water of 1: 1 (volume ratio).
After leaving for 1 minute, the WS ₂
From the wire surface. Next, water is added to hydrochloric acid to make the total amount 100 cm ^3, and then the hydrochloric acid solution in which WS ₂ is dispersed is filtered through filter paper. Thereafter, 10 cm ³ of a sulfuric acid / phosphoric acid mixture having a mixing ratio of concentrated sulfuric acid, phosphoric acid and water of 3: 2: 1 (volume ratio), 5 cm ^{3 of} perchloric acid and 20 cm of nitric acid
³ mixture of filter paper was put into the to dissolve the WS ₂ attached to the filter paper by the white smoke treatment. Thereafter, water is added to the mixture to make the total amount 100 cm ^3, and then the salt is dissolved. Then, the acid solution after dissolution is analyzed by the ICP method, and the amount of W is measured. By converting this to WS ₂ and dividing by WS mass, the amount of WS ₂ applied per 10 kg of wire can be calculated.

Next, a method for measuring the amount of Teflon applied will be described. First, a welding wire is put into a combustion tube of a tubular furnace, and calcined in an inert gas at 400 ° C. for a certain period of time to re-aggregate Teflon in a low-temperature portion in the combustion tube. Then, the wire is taken out and air and steam are flowed into the combustion tube for 10 minutes.
At a temperature of 00 ° C., the Teflon adhered to the combustion tube is absorbed by the baking water. The amount of fluorine in the liquid is measured by an ion chromatography method, and the amount of fluorine is determined. By dividing this by the mass of the wire, the amount of Teflon per 10 kg of the wire can be calculated.

Next, a method of measuring the wire feed resistance will be described. FIG. 5A is a schematic diagram illustrating a first wire feeding device used for measuring a wire feeding resistance, FIG. 5B is a schematic diagram illustrating the second wire feeding device, and FIG.
FIG. 3 is a schematic diagram showing the third wire feeding device.

In the first wire feeding device, a wire feeding device 12 is mounted on a slide table 14, and the wire feeding device 12 is also provided with a load measuring device provided on the slide table 14. Load cell 13 for
It is connected to the. A long conduit cable 3 through which the unwound welding wire is inserted is disposed on the discharge side of the wire feeding device 12. A drum 2c that wraps around the conduit cable 3 one round and tightens the feed path
Is formed, and the torch 4 is connected to the discharge side of the drum 2b through a guide 2d. Further, as shown in FIG. 5A, a neck fastening portion including three rollers 2a and 2b is provided. The torch 4 is disposed above the workpiece 15. The diameter of the roller 2a is, for example, 30 cm, the diameter of the roller 2b is, for example, 20 cm, and the diameter of the drum 2c is, for example, 30 cm.

The feed resistance is measured using the first wire feeder having the above-described configuration, and the welding wire wound on the spool 12a is sent out of the wire feeder 12 and the conduit cables 3 and The force applied to the wire 1 when it is welded through the welding torch 4;
This feed resistance varies depending on the feed path (the length of the conduit cable or meandering, etc.). Feeding device 1 as feeding resistance
2 measures the pressing force of the wire 1, and specifically, the feeding device 1
2 on the slide table 14 and slide table 1
The force acting on 4 is measured by the load cell 13.

As shown in FIG. 5B, the feeding resistance can be measured using a second wire feeding device. The second wire feeding device differs from the first wire feeding device in that the conduit cable 3 is not wound around the neck fastening portions (the rollers 2a and 2b) and passes over the roller 2a. Otherwise, it is the same as the first wire feeding device. The feeding resistance of the second wire feeding device is measured in the same manner as the first wire feeding device.

Further, the feed resistance can be measured using a third wire feeder, as shown in FIG. 5 (c). The third wire feeding device is different from the first wire feeding device in that the neck tightening portions (the rollers 2a and 2b) are not provided, and otherwise, the first wire feeding device is not provided. Same as the device. The feed resistance of the third wire feeder is measured in the same manner as the first wire feeder.

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the welding wire according to the present invention will be specifically described below in comparison with a comparative example in terms of feed resistance. In the following first to fifth examples, the feed resistance was measured under the feed resistance measurement conditions shown in Table 1 below. 5A and 5A shown in the column of the feed system in Table 1.
(B) and FIG. 5 (c) "show FIGS. 5 (a) and 5 (b) of the present invention.
(B) and FIG. 5 (c).

[0045]

[Table 1]

First Example A solid wire coated with oil and having irregularities formed on the surface shown in Table 2 below was prepared, and its feed resistance was measured by the above-described method under the conditions for measuring feed resistance shown in Table 1 above. It was measured.

In the first embodiment, JIS Z3312 which is a solid wire for mild steel is used as the solid wire.
The solid wire shown in YGW11 was used. The oil amount was 0.8 to 2.5 g per 10 kg of wire.
In addition, the surface shape of the wire shown in the following Table 2 was measured by the above-mentioned method. Some of the measurement results of the surface shape of the wire of the present embodiment are shown in FIGS. FIG. 7 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 2, and FIG. 8 is a comparative example.
A schematic diagram showing the measurement results of the surface shape of the wire of No. 14,
FIG. 9 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 16.

[0048]

[Table 2]

As shown in Table 2 above, in Examples Nos. 1 to 4, since the number of projections, the height difference between the projections and the depression, and the oil amount were within the ranges specified in the present invention, the feeding resistance was low. Excellent feedability was obtained.

On the other hand, in Comparative Example No. 14, since the number of projections was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 15, since the number of projections exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 16, since the number of projections and the height difference between the projections were less than the lower limit of the present invention, the feeding resistance was high,
The feedability was poor.

In Comparative Examples 17 and 18, since the number of convex portions exceeded the upper limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 19, the number of projections was less than the lower limit of the present invention, and the height difference of the irregularities exceeded the upper limit of the present invention. It was bad.

In Comparative Example No. 20, since the height difference of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 21, since the height difference of the unevenness was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

Second Example A flux-cored wire having irregularities formed on the surface thereof shown in Table 3 below and coated with a lubricant and an extreme pressure agent (extreme pressure additive) was prepared. It was measured by the above-described method under the measurement conditions of the feeding resistance shown.

In the second embodiment, the flux-cored wire is JIS which is a flux-cored wire for mild steel.
The flux-cored wire shown in Z3313 YFW-C50DX was used. The oil amount was 0.4 to 1.5 g per 10 kg of wire, and the extreme pressure agent was 0.3 to 0.8 g per 10 kg of wire. The extreme pressure agent shown in Table 3 is MoS ₂ , WS ₂ , C or Teflon. here,
The flux rate is 13.5%. In addition, the surface shape of the wire shown in the following Table 3 was measured by the above-mentioned method. Some of the measurement results of the surface shape of the wire of this embodiment are shown in FIGS. 10 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 6, FIG. 11 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 22, and FIG. 12 is Comparative Example No. 28. FIG. 7 is a schematic diagram showing the measurement results of the surface shape of the wire.

[0059]

[Table 3]

As shown in Table 3 above, in Examples Nos. 5 to 7, the number of convex portions, the height difference between the concave and convex portions, the oil amount, and the amount of the extreme pressure agent were within the ranges specified in the present invention. Low feed resistance and excellent feedability were obtained.

On the other hand, in Comparative Example No. 22, the number of projections was less than the lower limit of the present invention, and the height difference of the irregularities exceeded the upper limit of the present invention. The properties were poor.

In Comparative Example No. 23, since the height difference of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 24, since the number of projections exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 25, since the number of projections and the height difference between the projections and depressions were less than the lower limit of the present invention, the feeding resistance was high, and
The feedability was poor.

In Comparative Examples Nos. 26 and 27, since the number of convex portions exceeded the upper limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 28, since the number of projections was less than the lower limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 29, since the height difference of the unevenness exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 30, since the height difference between the irregularities was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

Third Example A solid wire having irregularities formed on the surface thereof shown in Table 4 below and coated with an extreme pressure agent (extreme pressure additive) was prepared, and its feed resistance was measured as shown in Table 1 above. Under the measurement conditions described above.

In the third embodiment, JIS Z which is a solid wire for stainless steel is used as the solid wire.
A solid wire shown in 3321 Y308 was used. The extreme pressure agent was 13 to 23 g per 10 kg of wire. The extreme pressure agent shown in Table 4 is MoS ₂ , WS ₂ , C or Teflon. The surface shapes of the wires shown in Table 4 below were measured by the above-described method. Some of the measurement results of the surface shape of the wire of this embodiment are shown in FIGS.
FIG. 13 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 8, FIG. 14 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 31, and FIG. 15 is Comparative Example No. 35. FIG. 7 is a schematic diagram showing the measurement results of the surface shape of the wire.

[0071]

[Table 4]

As shown in Table 4 above, in Examples Nos. 8 and 9, the number of projections and the height difference between the projections were within the ranges specified in the present invention, but the amount of the extreme pressure agent was Since the value exceeds the upper limit, the feeding resistance was higher than that of the first example, but excellent feeding property was obtained.

On the other hand, in Comparative Example No. 31, the number of projections was less than the lower limit of the present invention, and the height difference of the irregularities exceeded the upper limit of the present invention. The properties were poor.

In Comparative Examples Nos. 32 and 33, since the difference in height of the irregularities exceeded the upper limit of the present invention, the feed resistance was increased and the feedability was poor.

In Comparative Example No. 34, since the number of projections exceeded the upper limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 35, since the number of projections was less than the lower limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 36, since the number of convex portions exceeded the upper limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 37, since the number of projections and the height difference of the projections exceeded the upper limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 38, since the height difference between the irregularities was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 39, since the height difference of the unevenness exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

Fourth Example A flux-cored wire having irregularities formed on the surface thereof shown in Table 5 below and coated with an extreme pressure agent (extreme pressure additive) was prepared. The resistance was measured by the method described above under the measurement conditions.

In the fourth embodiment, as the flux-cored wire, a flux-cored wire shown in JIS Z3323 YF308, which is a flux-cored wire for stainless steel, was used. The extreme pressure agent was 35 to 47 g per 10 kg of wire. The extreme pressure agents shown in Table 5 are:
MoS ₂ , WS ₂ , C or Teflon. Here, the flux rate of the wire is 27%. In addition, the surface shape of the wire shown in the following Table 5 was measured by the above-mentioned method. FIG. 16 shows a part of the measurement results of the surface shape of the wire of this example. FIG. 16 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 10.

[0083]

[Table 5]

As shown in Table 5 above, in Examples Nos. 10 and 11, the number of projections and the height difference between the projections were within the ranges specified in the present invention. , The feed resistance is higher than in the first embodiment,
Excellent feedability was obtained.

On the other hand, in Comparative Example No. 40, the number of projections was less than the lower limit of the present invention, and the height difference of the irregularities exceeded the upper limit of the present invention. The properties were poor.

In Comparative Examples Nos. 41 and 42, since the difference in height of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 43, since the number of projections and the height difference of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 44, since the number of projections was less than the lower limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Examples Nos. 45 and 46, the number of projections and the height difference between the projections and depressions exceeded the upper limit of the present invention, so that the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 47, since the number of projections exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 48, since the height difference of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 49, since the height difference of the unevenness was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

Fifth Embodiment A welding wire coated with oil and having irregularities formed on its surface as shown in Table 6 below was prepared, and its feed resistance was measured by the above-described method under the feed resistance measurement conditions shown in Table 1 above. Was measured.

In the fifth embodiment, JIS Z323, which is an aluminum alloy wire, is used as the welding wire.
2 A welding wire shown in A5183-WY was used. The oil amount was 3 to 13 g per 10 kg of wire.
In addition, the surface shape of the wire shown in the following Table 6 was measured by the above-mentioned method. Some of the measurement results of the surface shape of the wire of this example are shown in FIGS. FIG. 17 shows Example No.
FIG. 1 is a schematic diagram showing the measurement results of the surface shape of the wire No. 12, FIG.
8 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 54, and FIG. 19 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 57.

[0095]

[Table 6]

As shown in Table 6 above, in Examples Nos. 12 and 13, the number of projections and the height difference between the projections were within the ranges specified by the present invention, but the oil amount was within the upper limit of the present invention. Since it exceeded, the feed resistance was higher than that of the first example, but excellent feedability was obtained.

On the other hand, in Comparative Example No. 50, since the number of convex portions was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Examples Nos. 51 and 52, since the difference in height of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 53, since the number of convex portions exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 54, since the number of projections and the height difference between the projections and depressions were less than the lower limit of the present invention, the feeding resistance was high, and
The feedability was poor.

In Comparative Examples Nos. 55 and 56, since the number of projections exceeded the upper limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 57, since the number of projections was less than the lower limit of the present invention, the feeding resistance was high and the feeding property was poor.

In Comparative Example No. 58, since the number of projections exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 59, since the height difference between the irregularities was less than the lower limit of the present invention, the feeding resistance was increased and the feeding property was poor.

In Comparative Example No. 60, since the height difference of the irregularities exceeded the upper limit of the present invention, the feeding resistance was increased and the feeding property was poor.

[0106]

As described above in detail, according to the present invention, since the number of protrusions formed on the surface of the wire and the height difference of the protrusions and depressions are appropriately regulated, the slipperiness of the wire in the conduit cable is improved. , And good feedability can be obtained even at the end of the long conduit cable on the torch side. For this reason, when welding is performed using a long conduit cable having a complicated path, good and stable wire feedability can be maintained even when a load is applied to the wire.

[Brief description of the drawings]

FIG. 1 shows the position (center angle) in the wire circumferential direction on the horizontal axis,
It is a graph which shows the uneven | corrugated shape of the outer peripheral surface of a wire in the cross section perpendicular | vertical to a longitudinal direction, taking a wire radius on a vertical axis | shaft.

FIG. 2 is a schematic view showing a production line for a welding wire.

FIG. 3 is a schematic diagram illustrating wire drawing of a wire rod by a cassette roller die.

FIG. 4 is a schematic diagram showing roundness of a cross section perpendicular to the longitudinal direction of a wire.

FIG. 5A is a schematic diagram illustrating a first wire feeding device used for measuring a wire feeding resistance, FIG. 5B is a schematic diagram illustrating the second wire feeding device, c) is a schematic view showing the third wire feeding device.

FIG. 6 is a schematic diagram showing a wire feeding device.

FIG. 7 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 2;

FIG. 8 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 14.

FIG. 9 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 16.

FIG. 10 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 6.

FIG. 11 is a schematic diagram showing a measurement result of a surface shape of a wire of Comparative Example No. 22.

FIG. 12 is a schematic diagram showing a measurement result of a surface shape of a wire of Comparative Example No. 28.

FIG. 13 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 8;

FIG. 14 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 31.

FIG. 15 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 35.

FIG. 16 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 10.

FIG. 17 is a schematic diagram showing the measurement results of the surface shape of the wire of Example No. 12.

FIG. 18 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 54.

FIG. 19 is a schematic diagram showing the measurement results of the surface shape of the wire of Comparative Example No. 57.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Wire 2a, 2b; Roller 2c; Drum 2d; Guide 3; Conduit cable 4; Welding torch 5; Contact tip 6; Payoff stand 7; 11; grooved roller 12; feeding device 13; load cell 14; slide table 15; material to be welded 20; wire surface shape 21; imaginary perfect circle 22, 23; roller 30;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Teruaki Sakae 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo F-term in Kobe Steel Research Institute Kobe Research Institute (reference) 4E084 AA31 AA33 CA38 HA12

Claims (3)

[Claims] An unevenness along the circumferential direction is formed on the circumferential surface, and the number of convex portions due to the unevenness is 3 to 12 per full length of the outer periphery of the wire in a cross section perpendicular to the longitudinal direction of the wire. A height difference of the unevenness is 4 to 20 μm. 2. MoS ₂ , WS ₂ , C
The welding wire according to claim 1, wherein at least one selected from the group consisting of Teflon and Teflon is applied in a total amount of 0.01 to 1 g per 10 kg of the wire. 3. The method according to claim 1, wherein the surface of the wire is at least one selected from the group consisting of vegetable oil, animal oil, mineral oil and synthetic oil.
0.5 to 3 oils per 10 kg of wire in total
The welding wire according to claim 2, wherein g is applied.