CN108788395A - A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle and welding gun - Google Patents

Abstract

The invention discloses an integrated TIG welding nozzle and a welding torch with symmetrical double wire feeding through the side wall, comprising a nozzle body, an outer wire feeding nozzle, a guide rod, a connecting sliding sleeve and an inner wire feeding nozzle; There are two through holes, and the outer wire feeding nozzle is welded on both sides of the nozzle body to communicate with the through hole to form a wire feeding channel, and the inner wire feeding nozzle is installed in the outer wire feeding nozzle; the guide rod is set on the outer wire feeding nozzle The rear end of the nozzle is connected with it, and is used to guide the feeding direction of the welding wire, and the connecting sliding sleeve is set on the upper part of the nozzle body. The welding wire is fed from both sides of the nozzle at the same time, and the two welding wires are fed symmetrically from the front and rear of the tungsten electrode at the same time, so that the deposition speed can be at least doubled; and the heat from the front and rear of the arc can be absorbed symmetrically , which ensures the symmetry of the arc heating the workpiece and the stability of the welding process under high-speed welding. At the same time, the two welding wires travel symmetrically in the arc to make more use of the residual heat of the nozzle and the heat of the arc column.

Description

An integrated TIG welding nozzle and welding torch with symmetrical double wire feeding through the side wall

technical field

The invention discloses a nozzle, in particular to an integrated TIG welding nozzle capable of double wire feeding through two wire guide nozzles symmetrically installed on the side wall and a welding torch on which the nozzle can be installed.

Background technique

Tungsten inert gas shielded welding (TIG welding) has a series of advantages such as stable welding process, wide application range, good weld quality, small welding deformation and small heat-affected zone because the electrode does not melt, and has been widely used in actual production. . However, this welding method can only use the heat of the pole area where the workpiece is located, and the heat generated by the pole area where the tungsten pole is located and the arc column are all dissipated, so its thermal efficiency coefficient is low, the penetration depth is small, the deposition speed is low, and the welding speed is low. slow, resulting in low welding productivity and high cost.

In order to improve the welding efficiency of TIG welding, scholars at home and abroad have developed many high-efficiency TIG welding processes, such as keyhole TIG, active TIG, double tungsten electrode TIG and hot wire TIG. Keyhole TIG uses a high current of over 600A to increase the electromagnetic contraction force and arc straightness, thereby improving the penetration ability, and can penetrate 12mm thick stainless steel at one time, but the increase in current will inevitably lead to heat-affected zone and Its grain size increases and joint performance deteriorates. Active TIG welding improves penetration through the use of active agents, but the use of active agents makes the welding preparation process cumbersome, and the weld surface shape is significantly worse, so its application is also greatly limited. Double tungsten TIG welding uses the arc ignited between the two tungsten electrodes and the workpiece for welding. The effective coupling of the two arcs further improves the stability of the arc and significantly increases the deposition speed. However, this welding torch is bulky and can reach Poor performance and operational flexibility. Hot wire TIG welding uses an additional hot wire power supply to preheat the filler wire, which solves the problem of low deposition efficiency in TIG welding. , Poor positioning accuracy and operational flexibility, and the improvement of deposition efficiency requires the use of additional energy. In addition, the above welding methods all have the problem that the cost is higher than that of ordinary TIG welding, and they have not fundamentally solved the problem of low utilization rate of traditional TIG welding arc energy. SAF has developed the TOPTIG welding process, which uses a single wire feeding method through the side wall of the nozzle. The welding wire absorbs the heat of the nozzle and the arc column area during the process of feeding the welding wire from the front or back of the tungsten electrode through the arc into the molten pool, and improves the welding process. The utilization rate of arc energy is improved, and the deposition speed and welding speed are effectively improved. Moreover, the nozzle structure is simple in structure, low in cost, convenient in operation, and beneficial to realize robot welding. However, when this process further increases the deposition speed, due to the high arc heat absorbed by the welding wire, the workpiece basically does not melt, resulting in defects such as hump weld beads or unfused edges. For example, when welding 2mm thick stainless steel with a welding speed of 500mm/min, a welding current of 150A, and an arc length of 4mm, if it is fed from the front of the tungsten electrode, the deposition speed reaches 24g/min (the corresponding wire feeding speed is 2.1m /min), the workpiece directly below the arc only melts a very thin layer, as shown in Figure 1(a). This thin layer of liquid metal solidifies rapidly, preventing the molten wire metal from flowing backwards, resulting in a humped bead in the weld, as shown in Figure 1(b). When the wire is fed from the back of the tungsten electrode, when the deposition speed reaches 28.5g/min (the corresponding wire feeding speed is 2.5m/min), the melting amount of the workpiece directly below the arc is little or not melted, as shown in Figure 2(a) As shown; although the molten pool metal spreads continuously on the weld bead, it cannot melt the base metal and solidify directly on it when it flows to the edges of both sides of the weld bead, resulting in unfused weld toe of the weld seam and presents a jagged shape, as shown in Fig. 2(b). On the other hand, at higher welding speeds, whether the wire is fed from the front of the tungsten electrode or from the rear, the weld bead exhibits bowing and lack of fusion at the edges.

To sum up, TOPTIG is the best way to improve the welding efficiency of TIG welding, but its improvement is limited; therefore, it is necessary to improve the welding torch used to further improve welding productivity and reduce welding costs.

Contents of the invention

In order to solve the above technical problems and further improve the deposition speed, welding speed and arc energy utilization rate, the present invention proposes to symmetrically arrange two wire guide nozzles on the nozzle, and the two welding wires are symmetrically fed from the front and rear of the tungsten electrode at the same time, In this way, the deposition speed can be at least doubled; and the heat at the front and rear of the arc can be absorbed symmetrically, which ensures the symmetry of the arc's heating of the workpiece and the stability of the welding process under high-speed welding. At the same time, the two welding wires Traveling symmetrically in the arc can make more use of the residual heat of the nozzle and the heat of the arc column, further improving the utilization rate of the arc energy, thereby further improving the welding production efficiency and reducing the welding cost.

One of the objectives of the present invention is to provide an integrated TIG welding nozzle and welding torch that can significantly increase the deposition speed and welding speed, and can remarkably increase the deposition speed and the welding speed through the symmetrical double wire feeding through the side wall.

The second object of the present invention is to provide the application of the integrated TIG welding nozzle and welding torch with symmetrical double wire feeding through the side wall.

The technical scheme that the present invention adopts is as follows:

An integrated TIG welding nozzle with symmetrical double wire feeding through the side wall, including a nozzle body, an outer wire feeding nozzle, a guide rod, a connecting sleeve and an inner wire feeding nozzle; two symmetrical openings are opened on the side wall of the nozzle body. The outer wire feeding nozzle is welded to the ends of the through holes on both sides of the nozzle body to form a wire feeding channel, and the inner wire feeding nozzle is installed in the outer wire feeding nozzle; the guide rod is set The rear end of the outer wire feeding nozzle is connected with it, and is used to guide the feeding direction of the welding wire, and the connecting sliding sleeve is sleeved on the upper part of the nozzle body.

Preferably, the two through holes are arranged symmetrically with respect to the axis of the nozzle body, which can ensure that the axes of the two welding wires, the axis of the tungsten electrode, and the centerline of the weld are all on the same plane during the welding process, ensuring that the arc The force, transition droplet and weld pool should be symmetrically distributed along the weld centerline and arc centerline as much as possible, which is conducive to obtaining a stable welding process and good weld shape.

Preferably, the included angle between the axis of the through hole and the axis of the nozzle body is 30-40°, so that the axis of the welding wire remains parallel to the conical surface of the tungsten pole tip that is usually ground to a cone angle of 60-80°, which is beneficial to control the welding wire The distance between the cone surface and the tip of the tungsten pole, a large number of experiments show that the welding process is the most stable when this distance is equivalent to the diameter of the welding wire.

Preferably, the axis of the outer wire feed nozzle is collinear with the axis of the through hole, so as to ensure that the axes of the two welding wires, the axis of the tungsten electrode and the center line of the weld are on the same plane, and ensure that the arc force, transition droplet, welding melt The pools are distributed symmetrically along the weld centerline and the arc centerline, which is conducive to obtaining a stable welding process and good weld formation.

Preferably, the outer wire feed nozzle is processed with two sets of internal threads, which are respectively used to connect the guide rod and the inner wire feed nozzle. The purpose of threaded connection is to facilitate the replacement of the inner wire feed nozzle to be suitable for welding wires of different diameters.

Preferably, the inside of the guide rod is provided with a through hole for feeding welding wire and an external thread for connecting an external wire feeding nozzle.

Preferably, the connecting sleeve is provided with an internal thread for connecting the torch body of the welding torch.

The present invention also provides a welding torch, which includes the above-mentioned integrated TIG welding nozzle with symmetrical double wire feeding through the side wall.

The invention also provides an application of an integrated TIG welding nozzle and a welding torch capable of symmetrical double wire feeding through the side walls in the field of mechanical manufacturing.

The beneficial effects of the present invention are:

In the present invention, two welding wires are fed symmetrically from both sides of the nozzle body at the same time (the wiring on the start buttons of the two wire feeders is connected in parallel, and the simultaneous feeding can be realized by controlling one button), which is the same as that of TOPTIG on one side. Compared with wire feeding, the deposition speed is doubled; compared with traditional TIG, the deposition speed can be increased by 2 times. The residual heat of the nozzle and the heat in the arc column area absorbed by the two welding wires before they are fed into the molten pool are also doubled compared with TOPTIG with single-side wire feeding, which reduces the loss of arc energy, and the utilization rate of arc energy is 12.5% higher than that of traditional TIG. TOPTIG increased by 6.2%, reducing welding costs. In addition, the simultaneous feeding of the two welding wires also ensures the symmetry of the arc heating the workpiece and the stability of the welding process under high-speed welding, significantly increasing the welding speed.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Figure 1(a). The welding current is 150A, the welding speed is 0.5m/min, the wire feeding speed is 2.1m/min, and the TOPTIG welding pool shape is fed from one side when the wire is fed from the front of the tungsten electrode;

Figure 1(b) shows the weld seam formation corresponding to Figure 1(a);

Figure 2(a) The welding current is 150A welding speed, 0.5m/min is the wire feeding speed, the wire feeding speed is 2.5m/min, and the TOPTIG welding molten pool shape is fed from one side when the wire is fed from the rear of the tungsten electrode;

Fig. 2(b) is the weld seam formation corresponding to Fig. 2(a);

Fig. 3 is a structural representation of the present invention;

Fig. 4 is a schematic diagram of the structure of a nozzle body processed with a through hole;

Fig. 5 (a) is the schematic diagram of the structure of the external wire feeding nozzle;

Figure 5(b) is a cross-sectional view of the external wire feed nozzle;

Fig. 6 is the structural representation of guide rod;

Fig. 7 is the schematic structural diagram of connecting sliding sleeve;

Fig. 8 is a structural schematic diagram of the inner wire feed nozzle;

Fig. 9 is a schematic diagram of the assembly of the present invention with a welding torch and a wire feeding system;

Fig. 10(a), the present invention obtains a stable welding process schematic diagram at a welding speed of 0.8m/min and a wire feeding speed of 5.0m/min;

Figure 10(b) is the weld seam formed in Figure 10(a).

In the figure: 1. Nozzle body, 2. Outer wire feed nozzle, 3. Guide rod, 4. Connecting sliding sleeve, 5. Inner wire feed nozzle, 6. Through hole on nozzle side wall, 7. Inside of outer wire feed nozzle Internal thread, 8. Internal thread inside the outer wire feed nozzle, 9. Through hole inside the guide rod, 10. External thread outside the guide rod, 11. Internal thread inside the connecting sleeve, 12. Welding torch, 13. Wire feed Tube 14. Welding wire.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof;

For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, it only means that they are consistent with the directions of up, down, left and right in the drawings themselves, and do not limit the structure. It is for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Terminology Explanation Part: Terms such as "installation", "connection", "connection" and "fixation" in the present invention should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral body; It can be a direct connection, or an indirect connection through an intermediary, or an internal connection between two elements, or an interaction relationship between two elements. Those of ordinary skill in the art can understand the above terms in the present invention according to the specific situation. specific meaning.

As introduced in the background technology, when the technology in the prior art further increases the welding speed or the wire feeding speed, defects such as hump and weld edge unfused will also appear in the weld; under the same welding current, with the welding speed With the increase of the wire feeding speed, the limit value of the wire feeding speed gradually decreases. In order to solve the above technical problems, this application proposes an integrated TIG welding nozzle with symmetrical double wire feeding through the side wall.

A typical implementation of this application is shown in Figure 3. The nozzle for filling wire TIG with double wire feeding includes: nozzle body 1, outer wire feeding nozzle 2, guide rod 3, connecting sliding sleeve 4, and inner wire feeding nozzle 5 .

There are two through holes 6 on the side wall of the nozzle body 1, the outer wire feeding nozzle 2 is welded on both sides of the nozzle, the guide rod 3 is connected with the outer wire feeding nozzle 2, and one end of the outer wire feeding nozzle 2 is connected to the through hole. The hole 6 communicates, and the other end communicates with the guide rod 3. The 4 connecting sleeves are installed on the upper part of the nozzle body 1, and the inner wire feeding nozzle (5) is installed inside the outer wire feeding nozzle. In the present invention, two welding wires are fed symmetrically from both sides of the nozzle body at the same time (the wiring on the start buttons of the two wire feeders is connected in parallel, and the simultaneous feeding can be realized by controlling one button), which is the same as that of TOPTIG on one side. Compared with wire feeding, the deposition speed is doubled; compared with traditional TIG, the deposition speed can be increased by 2 times. The residual heat of the nozzle and the heat in the arc column area absorbed by the two welding wires before they are fed into the molten pool are also doubled compared with TOPTIG with single-side wire feeding, which reduces the loss of arc energy, and the utilization rate of arc energy is 12.5% higher than that of traditional TIG. TOPTIG increased by 6.2%, reducing welding costs. In addition, the simultaneous feeding of the two welding wires also ensures the symmetry of the arc heating the workpiece and the stability of the welding process under high-speed welding, significantly increasing the welding speed.

In this example, as shown in FIG. 4 , preferably, the nozzle body 1 is provided with through holes 6 on both symmetrical sides, and the angle between the axis of the through hole 6 and the axis of the nozzle is 30-400, so that The axis of the welding wire is kept parallel to the conical surface of the tip of the tungsten pole that is usually ground to a cone angle of 60-80°, which is conducive to adjusting the distance between the welding wire and the conical surface of the tungsten pole tip during the welding process. A large number of experiments have shown that this distance is the same as that of the welding wire The welding process is most stable when the diameters are equal.

In a further preferred embodiment, the angle between the axis of the through hole 6 and the axis of the nozzle is 40°.

The two through holes are arranged symmetrically; this ensures that the axis of the two wires, the axis of the tungsten electrode, and the centerline of the weld are all on the same plane during the welding process, ensuring that the arc force, transitional droplet, and weld pool are along the welding line. The seam centerline and arc centerline are symmetrically distributed, which is conducive to obtaining a stable welding process and good weld shape.

In this example, preferably, the axis of the outer wire feed nozzle 2 is collinear with the axis of the through hole 6 . To ensure that the axes of the two welding wires are on the same plane as the tungsten electrode axis and the weld centerline, and ensure that the arc force, transition droplet, and weld pool are distributed symmetrically along the weld centerline and the arc centerline, which is conducive to obtaining a stable Welding process and good weld formation.

In this example, as shown in Figure 5, preferably, the outer wire feed nozzle 2 is internally processed with internal threads 7 and internal threads 8, the internal threads 7 are used to connect the guide rod 3, and the internal threads 8 are used to connect the internal feed Wire nozzle 5; the purpose of threaded connection is to facilitate the installation of welding wire and to facilitate the replacement of the inner wire feeding nozzle.

In this example, as shown in FIG. 6 , preferably, the inside of the guide rod 3 is provided with a through hole 9 for feeding welding wire and an external thread 10 for connecting an external wire feeding nozzle.

In this example, as shown in FIG. 9 , preferably, the other end of the guide rod 3 is connected to a wire feeding tube 13 , and the wire feeding tube is used for feeding wire.

In this example, as shown in FIG. 7 , preferably, an internal thread ( 11 ) for connecting a welding torch is provided inside the connecting sleeve 4 .

In this example, as shown in FIG. 9 , preferably, the connecting sleeve 4 fixes the nozzle on the welding torch.

Utilize above-mentioned device, the present invention has been tested, as shown in Figure 10 (a) and 10 (b), obtained stable welding process under the welding speed of 0.8m/min, 5.0m/min wire feeding speed (as shown in Fig. 10(a)) and good weld formation (as shown in Figure 10(b)), the deposition rate reached 57.0g/min.

In addition, the present invention also provides a welding torch, which includes the above-mentioned integrated TIG welding nozzle with symmetrical double wire feeding through the side wall, and the existing devices can be used for the remaining parts.

The present invention also protects the application of the integrated TIG welding nozzle and welding torch in the field of machinery manufacturing, including various food machinery, power machinery, lifting and transportation machinery, agricultural machinery, metallurgical and mining machinery, chemical machinery, textile machinery, machine tools , tools, instruments, meters and other machinery and equipment production industry.

The above example is only a preferred example of the present invention, and the scope of rights of the present invention cannot be limited by this example. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the scope of the present invention.

Claims (8)

1. a kind of integral type TIG carrying out double wire feeds by two wire guiding nipples being symmetrically mounted on side wall welds nozzle, feature It is, including nozzle body, outer wire feeding mouth, guide rod, connection sliding sleeve and interior wire feeding mouth；

Opened up on the side wall of the nozzle body there are two through-hole, the outer wire feeding mouth be welded on nozzle body both sides with it is described Through-hole is connected to form wire feed channel, and the interior wire feeding mouth is mounted in the outer wire feeding mouth；The guide rod setting is outside The rear end of wire feeding mouth is coupled, and for being oriented to the direction that welding wire is sent into, the connection sliding sleeve is sleeved on nozzle body Portion.

2. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that two institutes The through-hole stated is arranged relative to the axisymmetrical of nozzle body.

3. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described logical The axis in hole and the angle of nozzle body axis are 30~40 °.

4. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described outer The axis of wire feeding mouth and the axis collinear of through-hole.

5. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described outer It is machined with inside wire feeding mouth for the internal thread I of connection guide and interior wire feeding mouth, internal thread II.

6. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described to lead The through-hole for conveying welding wire and the external screw thread for connecting outer wire feeding mouth are provided with inside bar.

7. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that the company Connect the internal thread being provided with inside sliding sleeve for connecting welding gun.

8. a kind of welding gun, which is characterized in that it includes any one by the double wire feeds of sidewall symmetry of claim 1-7 Formula TIG welds nozzle.