KR101181214B1 - Copper-Plated Flux Cored Wire for Gas Shield Arc Welding and Method for Preparing The Same - Google Patents

Abstract

 A copper-plated gas shielded arc welded flux cored wire suitable for forming a copper plated film layer having excellent electrical conductivity on both the inner and outer surfaces of the shell and having a predetermined surface roughness is provided. Excellent corrosion resistance and electrical conductivity to stabilize the arc, reduce the amount of spatter and fume, and form an appropriate lubrication pool on the wire surface to provide excellent supplying power even for long conduit cables. It is possible to weld and also improves the wearability of the welding tip, so it is also excellent for acceptance welding, semi-automatic welding and robot automatic welding.

Description

Copper-Plated Flux Cored Wire for Gas Shield Arc Welding and Method for Preparing The Same}

The present invention relates to a copper plated flux cored wire for gas shielded arc welding and a method of manufacturing the same.

 In general, the flux cored wire for gas shielded arc welding is divided into flux cored wires having a joint structure and a joint type having a cross-sectional structure because the flux is filled in the steel shell and the piping is carried out. The type with joints has a cross-sectional structure of various shapes depending on the shape of the tube roll, and wires of 0.8 to 1.6 mm diameter are most used.

Flux cored wires have a higher current density than solid wires, resulting in better arc stability and less spatter under the same current and voltage. In addition, it is easy to apply all post welding depending on the type of flux injected into the steel shell, and many welders prefer it as an accommodating welding. It is mainly used for heavy and heavy plate welding, whereas solid wire has copper plating on the wire surface. It is divided into types and types that are not copper plated. In general, since both types of welding workability is relatively inferior to flux cored wire, both types are mainly used for thin-layered single layer welding in the form of large-capacity packaging by robots or auto-carriage.

In addition, while solid wire is applied to a large amount of industrial fields such as automobiles and construction machinery, flux cored wire is applied to various industries such as shipbuilding, steel, construction, and bridges because of its ease of use. It is a situation that must satisfy the lack of needs, among which arc stability, rust resistance and supplyability may be considered as a priority. In particular, the arc stability has a great influence on the flux injected into the outer shell, but it is clear that the conductance of the wire itself is also an important factor. Additionally, the anti-rusting property is improved by the plating film for improving the conduction ability. Silver is highly related to wire surface characteristics and stiffness, and various wire itself quality such as cast and helix as well as the usage conditions in the field.

Therefore, many welding materials manufacturers are studying copper plating which is relatively inexpensive and highly conductive in order to make arc stability, rust resistance and supplyability at the same time in this respect. However, in case of copper plating, the joint type of liquid penetrates into the wire through the joint to deform the flux, or the liquid remaining in the wire causes the welding of peaks, blue holes, etc. There is a problem that causes a defect. Therefore, there is a problem that copper plating is difficult to be performed on the joint core type flux cored wire. Copper plating on flux cored wire surfaces has become commonplace with flux cored wires of seamless type. This is because copper plating can be carried out without penetrating the plating liquid into the shell.

The seamless wire can be manufactured in two ways: firstly, the supplied steel shell is a cylindrical pipe without a seam, filling the flux with vibration, and secondly, a continuous plate-shaped steel. After the outer shell is formed into a U-shape, flux is injected, and then the joint is sealed by laser welding or resistance welding.

The commercially available flux cored wires on the market are copper plated at approximately 2.0 ~ 3.0mm diameter through the tubing and degreasing process, after which the finishing wire (secondary wire) adopts the inline wet method. This can be seen through the wire surface. In the case of wet drawing, it is manufactured at a maximum of 500 m / min or less, which is different from the maximum of 1,500 m / min of dry drawing.

In addition, the flux-cored wire without a joint is filled with the flux inside, and after forming, the joint is welded to the surface and copper plated to the surface, but the cost is increased due to the increase in the number of welds, and the flux is deteriorated by the weld heat affected zone. There is also a problem that causes degradation of the weldability of the product.

Therefore, copper plating is effectively applied to both of the jointed type or the jointed type flux cored wire, and to provide a flux cored wire manufactured by a dry process and having excellent physical properties.

According to an aspect of the present invention provides a flux cored wire having a copper plating layer formed on both the inner surface and the outer surface of the steel shell.

According to one embodiment, the cylindrical steel shell, the flux is filled in the steel shell, a copper plating film layer formed on the inner surface and the outer surface of the steel shell, the copper plating film layer is formed with a lubrication pool which is a groove filled with a solid lubricant on the outer surface KS B Provided is a copper cored flux cored wire for gas shielded arc welding with a surface roughness (Ra) of 0.2 to 0.8 µm as specified in 0161.

The steel shell may be made up of 0.04% by weight of carbon, 0.10% by weight of silicon, 0.50% by weight of manganese, 0.05% by weight of aluminum, and the balance of iron and inevitable impurities.

The flux-cored wire for copper-plated gas shielded arc welding according to the present invention has a carbon content of 0.04% by weight or less remaining on the wire surface of the final wire diameter, and the total thickness of the inner and outer copper plating layers of the final wire diameter may be 0.2 μm or more. .

These flux cored wires can be applied to both seams with or without seams. This is because the flux cored wire having the above copper plating film layer formed thereon may be manufactured by first copper plating the steel shell and then filling and drawing the flux.

According to yet another aspect of the present invention, there is provided a method of manufacturing the copper plating flux cored wire for gas shield arc welding.

Another example manufacturing method comprises the steps of: providing a steel shell; A plating step of forming a copper plating film on the inner surface and the outer surface of the steel shell; Forming an antioxidant film on the copper plating film; A filling step of filling the flux; Tubulation step; And a dry fresh step using a dry lubricant; It includes.

According to the method, a copper plating film is formed before filling the steel shell with the flux. By manufacturing flux cored wire using copper plated steel sheath, plated film is formed inside and outside of final wire, which improves electrical conduction, stabilizes arc, reduces the amount of spatter and fume, and improves the wear of welding tip. , Improves hearing resistance. In addition, both the pipe and the drawing process can be carried out in a dry process can greatly improve the productivity.

In addition, an antioxidant film is formed on the copper plating film for the purpose of preventing oxidation of the plating layer. The antioxidant film is, for example, a film of a mixed solution of benzotriazole, ethylene homoploymer, polyoxyethylene nonylphenyl ether, potassium hydroxide, and water It can be formed by coating.

In the plating step, the thickness of the plating layer is 0.5 to 1.5 μm, and the total thickness of the inner and outer copper plated coating layers at the final wire diameter after the tube and dry drawing step may be 0.2 μm or more.

In the dry drawing step, while maintaining the carbon content remaining on the wire surface of the final wire diameter to 0.04 or less by weight, a lubrication pool is formed on the wire surface to form a wire surface roughness (Ra) range of 0.2 to KS B 0161. It can be set to 0.8 micrometer. Thus, when it has predetermined surface roughness, even in the case of welding using a long conduit cable, it is excellent in supplyability and it is possible to carry out continuous welding for a long time.

1 is a cross-sectional view of a flux cored wire for copper plated gas shield arc welding according to one embodiment of the present invention;
2 is a manufacturing process diagram of a flux cored wire for copper plated gas shield arc welding according to another embodiment of the present invention;
3 is a cross-sectional view of a steel shell in which a copper plating film and an antioxidant film are formed according to FIG. 2;
4 shows the tubular shape of the flux cored wire;
5 is a photograph of observing a copper plating layer of wire No. 6 using SEM equipment;
6 is a photograph taken with an optical microscope of the shape of the lubricating glue on the surface of wire No. 6;
7 is a view showing a wire feedability test apparatus in the embodiment.

 Advantages and features of the present invention and methods of performing the same will be understood more readily by reference to the following detailed description of the embodiments. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In addition, it is to be understood that all numbers indicating numerical values of components, reaction conditions, and the like used in the specification and claims of the present invention may be modified. Thus, unless expressly stated to the contrary, the numerical parameters set forth in the specification and appended claims of the present invention are approximations that may vary as desired for the present invention.

One. Flux cored wire for copper plated gas shielded arc welding

1 is a schematic cross-sectional view of a flux cored wire for copper plated gas shield arc welding according to an embodiment of the present invention.

Referring to FIG. 1, the copper-plated gas shielded arc welding flux cored wire 100 may include a cylindrical steel shell 110, a flux 200 filled in the steel shell 110, and an inner surface and an outer surface of the steel shell. Copper plated coating layers 121 and 122 formed.

The flux cored wire 100 of FIG. 1 is of a type having a seam. Thus, the flux cored wire of the joint type is dried to the final wire diameter using dry lubricant (Na-based, K-based lubricant), and then physically removed the lubricant remaining on the surface of the wire. After the process of remaining on the surface in solid form or removing residual lubricant on the surface of the wire (350 ℃ baking process), the material required for supplyability may be applied in a thin film form. ) Are often fresh depending on dry lubricants.

However, with the use of a dry lubricant, the use of a dry lubricant can be at least twice as fast as a wet lubricant. For this reason, wet lubricants make the wire surface cleaner than dry lubricants, but they are less lubricious. Since the frictional resistance is high on the contact surface with the hold dice at the time of high speed drawing, the life of the dies is shortened. Therefore, the use of a dry lubricant for the high speed drawing is very advantageous in terms of productivity.

The flux cored wires FCW 100 have copper plating layers 121 and 122 formed on both inner and outer surfaces of the steel outer shell. Therefore, it is possible to improve the conduction and stabilize the arc, thereby reducing the amount of spatter and fume, further improving the wear resistance of the welding tip, and improving the rust resistance. In addition, both the pipe and the drawing process can be carried out in a dry process can greatly improve the productivity.

The copper plating film layer 122 formed on the outer surface is formed with a lubrication pool, which is a groove part filled with lubricant, so that the surface roughness Ra specified in KS B 0161 is 0.2 to 0.8 µm. The inventors of the present invention form a lubrication pool on the surface of the final wire diameter to maintain the wire surface roughness (Ra) range appropriately in KS B 0161 even when welding using a long conduit cable. It was confirmed that the wire feeding property was good and the tip wearability was also extremely excellent.

The steel shell 110 may be made up of 0.04% by weight of carbon, 0.10% by weight of silicon, 0.50% by weight of manganese, 0.05% by weight of aluminum, and the balance of iron and inevitable impurities. In addition, the carbon content remaining on the wire surface of the final wire diameter in the flux cored wire (FCW) 100 is 0.04% by weight or less. If the carbon content exceeds this, the amount of fume generated increases.

Although the thickness of the copper plating layers 121 and 122 is not particularly limited, the total thickness of the inner and outer surface copper plating layers of the final wire diameter may be 0.2 μm or more in order to satisfy desired conduction and physical properties.

The flux 200 is a mixture of a metal or an alloy component, a slag forming agent, or the like, and may be used by mixing various metal or alloy components according to the purpose.

2. Manufacturing method of flux cored wire for copper plated gas shielded arc welding

2 shows a process diagram for a method of manufacturing a flux cored wire for copper plated gas shield arc welding according to an embodiment of the present invention. The process indicated by the solid line in FIG. 2 is an essential step, and the process indicated by the dotted line is an optional step that may or may not be performed selectively.

Referring to Figure 2, the manufacturing method according to this embodiment comprises the step of providing a steel shell (S1); Plating step (S2) to form a copper plating film on the inner surface and the outer surface of the steel shell; Forming an anti-oxidation film on the copper plating film (S3); Filling step of filling the flux (S4); Tubing step (S5); And dry drawing step (S6) using a dry lubricant.

In some cases, after the step (S1) of providing the steel shell may be subjected to the electrolytic degreasing (S1-1) and / or pickling (S1-2) process, copper plating film formation (S2 after the antioxidant film formation (S3) After the cleaning (S2-1) process, and after the anti-oxidation film formation (S3) may be subjected to the drying (S3-1) process, the steel material is U-shaped to facilitate the filling before the flux filling (S4). Molding (S3-2) to be molded may be further roughened.

3 is a cross-sectional view schematically showing a steel shell in which the copper plating film and the antioxidant film are formed. Referring to FIG. 3, copper plating films 121 and 122 are formed on both the inner and outer surfaces of the steel shell 110. In addition, antioxidant films 131 and 132 are formed on the outer surfaces of the copper plating films 121 and 122. However, the anti-oxidation films 131 and 132 need not be formed on both the copper plating film 121 on the outer surface and the copper plating film 122 on the inner surface, and the copper plating film on the outer surface where the corrosive gas such as oxygen gas is easily accessible. 121 may be formed only.

Hereinafter, the steps will be described in detail.

Provision of steel shell (S1)

The inventors examined the copper plating applicability after investigating the steel shell type and component used as the joint core type flux cored wire, and finally, the steel shell having the most suitable copper plating thickness for the present invention could be set. As a result, it was found that copper plating by appropriately limiting the C, Si, Mn, and Al content of the steel shell is the best fit for the present invention. Also, the copper sheathed copper shell was used to provide not only the conduction wire, the corrosion resistance, but also the arc stability. It was confirmed that the amount of spatter and fume can be minimized.

Thus, the steel shell may be made up of 0.04% by weight of carbon, 0.10% by weight of silicon, 0.50% by weight of manganese, 0.05% by weight of aluminum, and the balance of iron and unavoidable impurities.

The steel shell used for the flux cored wire of the present invention is a cold rolled steel sheet and a steel sheet of a steel strip according to JIS G3141. The carbon (C) component in the shell is one of the five most basic elements in metals. It is an indispensable ingredient in maintaining hardness, and its content greatly affects the amount of fume generated. Particularly, the drawing wire using HOLDIS determines the degree of work hardening according to the carbon content, and it is defined as 0.04wt% (hereinafter referred to as%) because it affects the rigidity of the final wire, which is an important factor of supplyability. If it exceeds, the amount of fume will be generated.

Silicon (Si) is defined as 0.10% or less because it increases wire stiffness to improve wire feeding during wire drawing, and in particular, acts as a deoxidizer for weld metal, spreads weld bead well, and makes uniform appearance. In case of exceeding 0.10%, the wire rigidity is high, which leads to frequent disconnection problems in manufacturing the product, thereby reducing productivity.

Manganese (Mn) is also a component that must be added because it provides excellent stiffness while increasing the stiffness of wires and provides ductility, and at the same time plays a role of replenishing deoxidizer and alloying elements during welding, The content is prescribed | regulated to 0.50% or less. In addition, when the manganese (Mn) exceeds 0.50%, the wire stiffness becomes too large to increase the amount of tip wear.

Aluminum (Al) has a large role as a deoxidizer at the time of welding, and also has an effect of reducing the amount of spatter by reducing the volume size. If Al exceeds 0.05%, the volume becomes large inversely, and a large amount of spatter is generated, and the metal structure is embrittled while remaining in the weld metal portion during welding, thereby deteriorating toughness and ductility. Other steel skin components are composed of iron (Fe) and unavoidable impurities.

Electrolytic Degreasing (S1-1)

If the rust preventive agent is applied to the provided steel shell may be subjected to an electrolytic degreasing process before the step of forming a copper plating film. In other words, electrolytic degreasing is intended to remove this when the rust preventive is applied to the steel surface for the purpose of preventing rusting when the raw material of the steel jacket is received.

Pickling treatment (S1-2)

Before forming the copper plating film, pickling treatment using sulfuric acid may be performed for adhesion and uniformity of plating. The pickling process activates the steel shell surface to be suitable for plating, thereby increasing the effect of copper plating.

If the electrolytic degreasing or sulfuric acid pickling treatment prior to the plating process is insufficient, the surface of the steel shell may not be sufficiently activated, thereby inhibiting the plating and deteriorating the adhesion of the plating.

Copper plating film formation (S2)

Electroplating or chemical plating is performed on both sides of the provided steel shell or the steel shell which has undergone electrolytic degreasing to have a copper plating film.

At this time, the thickness of the copper plating film is not particularly limited. However, since the copper itself is soft, the object of the present invention cannot be sufficiently achieved when a large amount of copper is plated, such that a large amount of plating is peeled off in the subsequent finishing drawing process. On the other hand, if the copper plating film thickness of the steel shell is formed too thin, it is difficult to expect the copper plating effect such that some plating layers are peeled off and the surface is exposed during the reduction of the finishing process. Accordingly, the thickness of the copper cup may be about 0.5 to 1.5 µm when the copper plating film is formed.

Antioxidation film formation (S3)

After the copper plating layer is formed, when a corrosive gas is contacted to the surface of the steel shell or a high temperature or impact is applied, an oxide layer in which a portion of the plating layer is oxidized may be generated, thereby degrading the electrical conductivity. Therefore, in the present invention, to prevent such a problem, an anti-oxidation film may be formed after the plating process.

The antioxidant film can be formed by performing a wet coating composed of a hydrocarbon compound, for example, benzotriazole, ethylene homoploymer, polyoxyethylene nonylphenyl It can be formed by coating the film with a mixture of ether (Polyoxyethylene nonylphenyl ether), potassium hydroxide (Potassium hydroxide), and water (water).

Flux Filling (S4)

After forming the steel shell formed on the antioxidant film into a U-shape, a filling flux in which a metal or alloy component, a slag forming agent, or the like is mixed is filled into the U-shaped shell.

Tube and Fresh (S5 and S6)

The tube-forming step of forming the flux-filled U-shaped tube into a tubular shape and the process of drawing the molded tubular to a desired diameter, that is, a final wire diameter.

When the steel shell having a copper plating thickness of 0.5 to 1.5㎛ is manufactured to the final wire diameter, the copper plating layer on the outer surface of the wire is partially cut and thinly formed at the time of finishing drawing (dry drawing), and the copper plating layer inside the wire has a thin wire. While being exempted by the flux, the copper plated coating layer is thinned and peeled off by the fluxes.

Thus, in the present invention, the total thickness of the inner surface and the outer surface copper plating layer of the final wire diameter may be 0.2 μm or more. If the total thickness of the inner and outer copper plated coating layers is 0.2 占 퐉 or less, sufficient current conduction required by the present invention cannot be secured, and the anti-corrosion effect is less effective, especially in welding rollers, and also plated in conduit cables and tips. By peeling off, there exists a problem that welding workability worsens, such that supplyability becomes unstable and a large amount of spatters generate | occur | produce. This copper plating on the wire surface reduces the wear resistance in the conduit tube and at the same time improves the electrical conduction at the tip end to stabilize the arc.

In the finishing wire (secondary wire), a part of the dry wire is applied, and a lubrication pool can be formed on the surface of the wire by degreasing and coating the wire surface with a liquid lubricant in a wet form rather than immersion.

Therefore, the surface roughness (Ra) of the wire specified in KS B 0161 can be secured at 0.2 to 0.8 μm. If the surface roughness (Ra) is less than 0.2㎛, the slip occurs in the roller portion of the wire feeder, worsening the supplyability, making the arc unstable, and the surface of the wire is excessive lubricant or surface roughness (Ra) of 0.8㎛ If it is welded for a long time in excess, copper residues and lubricant residues accumulate in the conduit tip to increase the supply resistance, which may lead to poor wire supply, or to generate welding defects such as fine bits or blue holes on the weld bead surface.

The copper-plated gas shielded arc welding flux cored wire according to the invention may be of a type with seams. This is because it can be manufactured through flux filling, tubing and drawing using copper plated steel sheath.

Hereinafter, the effects of the present invention will be described in detail with reference to Examples.

[Example]

The steel shell was cold rolled steel sheet and steel strip according to JIS G3141 standard according to the chemical composition shown in Table 1, and the shape of the joint was controlled by using various sizes of 10 ~ 16mm width and 0.4 ~ 1.0mm thickness. Copper plated film was formed, and then the film was coated with the mixed solution of Table 3, and the copper-plated flux cored wire of 1.2 mm diameter was tested and manufactured on the spool using the flux shown in Table 4 at a filling rate of 15%. A wound wire was used. In addition, the wire cross-sectional structure was made into the type with a joint part shown to FIG. 4 (b-d).

[Table 1]

[Table 2]

[Table 3]

[Table 4]

First, the chemical composition analysis of the steel shell used was analyzed three times for each component using an ICP (Inductively Coupled Plasma Atomic Emission Spectrometer) analyzer and the average values are listed in Table 1, and the copper plating layer thickness and final wire copper plating thickness of the steel shell were Electron. It was measured by observing magnified 5,000 to 10,000 times with a microscope (SEM / EDS) (see Figure 5).

The carbon content remaining on the surface of the final product is a factor that affects the feedability and the fault resistance, and the average value is obtained by measuring the data three times using LECO's RC412 analyzer.

In addition, the method for measuring the surface roughness (Ra) of the final product specified in KS B 0161 shall be as follows.

① Cut and sample the final product wire to the length of about 10cm.

② Using DIAVITE's DH-5 surface roughness measuring instrument, measure five or more times in the remaining three directions except the seam for each specimen type and take the average value.

Lubrication glue presence and absence on the surface of the copper plated final product was determined by observing an optical microscope at 200 times (see FIG. 6).

 [Table 5]

Tip wear, feedability, fume and spatter generation amount were examined for each test wire, and additionally, the rust resistance and the fault resistance were checked together, and the results are shown in Table 7 below.

The wire tip wearability was measured by changing the weight of the conduit tip after continuous welding for 1 hour under the welding conditions shown in Table 6, and compared with the inside diameter size of the conduit tip before welding. They were either heavily tipped or had a wider tip. The criterion for tip wear is 0.02 g / hr. The following was made favorable.

TABLE 6

The supplyability was evaluated by using test equipment in which a curved portion was arbitrarily formed as shown in FIG. 7. A 6m welding cable was connected to a 500A welding machine and evaluated as 100% CO2 gas. The welding current was 280 to 300A and the welding voltage. Is welded at 31 ~ 32V, continuous welding for 3 minutes in one test, and the arc is supplied without interruption (○), if the arc is interrupted about 1 ~ 2 times during the supply (△), supply is frequently The case of unstable wire supply was evaluated as (x).

The fume generation amount calculated | required the average value measured 5 according to AWS F1.2: 19, and the fume generation amount was made good at 800 mg / min or less.

The amount of spatter generated was made by using a collecting box made of copper, and welded five times (one welding time of 1.5 minutes) under the welding conditions shown in Table 4 by bead-on-plate welding. Converted. The amount of spatter generated is stable at arc at 1 g / min or less and good workability. The results are summarized in Table 5.

Evaluation of the rust resistance was maintained for 36 hours in a constant temperature and humidity bath at 40 ° C. and 85% RH, and when rust resistance was observed and no rust occurred on the surface of the wire (○), slight rust was generated. In the case of (Δ), numerous cases of spot or stripping occurred (x).

Fault tolerance test, the prepared wire by the general welder 500A capacity, DH32 12t x 300w x 100ℓ using a force higher current, a 320 ~ 360A, 34 ~ 38V and the shielding gas a high voltage is a mixed gas of 80% Ar + 20% CO ₂ The bead-on-plate welding was carried out at a gas flow rate of 20 l / min to observe the presence of weld defects in the bead appearance, and if no weld defects such as wormholes, blue holes, or pits occurred (○), When it occurs in 1 or 2 places with a small amount (△), it appeared as long in the longitudinal direction of a weld bead, or when it generate | occur | produced severely (x).

[Table 7]

In the results of Table 7, wire Nos. 1 to 8 are examples of the present invention, and wire Nos. 9-16 is a comparative example. In this embodiment, all of the tip wear, arc stability, feeding ability, rust resistance, and defect resistance can achieve good results. SEM photographs and optical micrographs of wire No. 6 are shown in FIGS. 5 and 6, respectively.

On the other hand, in the comparative example, the wire No. 9 is excessively thick copper plated layer of steel shell, so the final product wire is wrapped with copper plating waste in feed roller and conduit cable when long length conduit cable is continuously welded. As a result, the arc became unstable and a large amount of spatter was generated.

Wire no. Fig. 10 shows a non-copper plated flux cored wire, which is relatively inferior in arc stability, tip wear and rust resistance to the copper cored flux cored wire.

Wire no. 11 is because the Al content is high among the components of the steel shell used, the volumetric capacity during welding increases, so that a large number of opposing spatters are generated. In addition, the thickness of the copper plating layer is thin, and thus the invention is excellent in terms of feeding, rust resistance, and arc stability. Were inferior to their target quality.

Wire no. 12 excessively increased surface roughness (Ra) due to the formation of excessive lubrication pools on the surface of the used steel shells, resulting in weaker fault tolerance during welding while increasing the residual carbon content of the wire surface due to the large amount of residual lubricant. . In addition, the conduction of the wire surface was reduced, and the spatter was also increased while the arc was slightly unstable, leaving residual lubricant and copper plating residue together in the feeding roller and the conduit cable.

Wire no. 13 is excellent in electrical conduction because the copper plating layer on the wire surface is stable, but the surface roughness is low because there is little lubrication pool formation on the wire surface, and as a result, the supplyability is unstable due to frequent slip phenomenon in the feed roller during long-term continuous welding. As a result, the amount of spatter generated is increased, and eventually welding cannot be continued.

Wire no. 14 is thin copper plating layer of the final wire surface, easy to peel off plating, unstable rust resistance and supplyability is poor overall welding workability, and compared to the case without copper plating, the amount of supply and tip wear But the weldability tends to be poor.

Wire no. In the case of 15, the carbon content among the alloy components of the steel shell for copper plating was too high, so that the hardening was so severe when the wire was used using the HOLE dies, and the disconnection occurred frequently. In the case of continuous welding for a long period of time, a problem of remarkably reducing tip wear was found due to the large wire rigidity.

Wire no. In the case of 16, copper plating is performed to prevent plating layer oxidation of the plated steel shell, and the coating coating with a mixed solution composed of hydrocarbon compounds is omitted.The overall quality level such as arc stability, tip wearability, and supplyability is good, but relatively It was vulnerable in the parts of hearing resistance.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (8)

delete delete A cylindrical steel shell, a flux filled in the steel shell, and a copper plating layer formed on the inner and outer surfaces of the steel shell;
The copper plating film layer formed on the outer surface is formed with a lubrication pool, which is a groove part filled with lubricant, so that the surface roughness (Ra) prescribed by KS B 0161 is 0.2 to 0.8 µm;
The steel shell is made up of 0.04% by weight of carbon, 0.10% by weight of silicon, 0.50% by weight of manganese, 0.05% by weight of aluminum, and the balance of iron and unavoidable impurities;
A flux cored wire for copper plated gas shielded arc welding, wherein the carbon content remaining on the wire surface of the final wire diameter is 0.04 wt% or less, and the total thickness of the inner and outer copper plated coating layers of the final wire diameter is 0.2 μm or more. The method of claim 3, wherein
Flux cored wire for copper plated gas shielded arc welding, of the type with seams. A method of manufacturing a copper plated flux cored wire for gas shielded arc welding according to claim 3 or 4,
Providing a steel shell;
A plating step of forming a copper plating film on the inner surface and the outer surface of the steel shell;
Forming an antioxidant film on the copper plating film;
A filling step of filling the flux;
Tubulation step; And
Dry drawing step with lubricant; It includes, a manufacturing method. The method of claim 5, wherein
The antioxidant film is formed by coating the film with a mixture of benzotriazole, ethylene homoploymer, polyoxyethylene nonylphenyl ether, potassium hydroxide, and water. Which is, the manufacturing method. The method of claim 5, wherein
The thickness of the plating layer in the plating step is 0.5 ~ 1.5㎛, the total thickness of the inner surface and the outer surface copper plating film layer in the final wire diameter after the tube and dry drawing step is 0.2 ㎛ or more. The method of claim 5, wherein
In the dry drawing step, while maintaining the carbon content remaining on the wire surface of the final wire diameter to 0.04% by weight or less, by appropriately forming a lubrication pool on the wire surface to the extent of the wire surface roughness (Ra) prescribed in KS B 0161 is 0.2 The manufacturing method which is set to -0.8 micrometer.

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