A high deposition rate gas shielded welding torch

Abstract

The present application relates to a kind of high deposition rate gas shielded welding nozzle, belong to welding technical field.The gas shielded welding nozzle is by nozzle, welding wire guide pipe, multi-tooth welding wire holder, multi-tooth welding wire clamp, flow divider is formed;When assembling, the guide pipe body of welding wire guide pipe is with the mode of pipe shoulder limit in the front end surface of nozzle inner cylinder and is installed in the central welding wire guide pipe hole of nozzle;Multi-tooth welding wire clamp is embedded in the central through hole with the mode of elastic clamping tooth outside abutting to the inner wall of multi-tooth welding wire holder conical cavity;The outer thread of flow divider is screwed with the inner cylinder thread of nozzle, and the front end of multi-tooth welding wire holder is abutted on the pipe shoulder of nozzle by pressing multi-tooth welding wire clamp.Adopting the present application, the position of welding wire electrical contact point is effectively guaranteed, the wear resistance of welding wire guide pipe is increased, and the inner diameter wear of welding wire guide pipe is prevented;And can effectively compensate wear, improve the height of welding wire power point, increase the preheating length of welding wire, and improve the deposition rate of welding wire.

Description

TECHNICAL FIELD

[0001] The application relates to a welding nozzle for gas shielded arc welding, in particular to a high deposition rate gas shielded welding nozzle, and belongs to the technical field of welding. BACKGROUND

[0002] In the gas shielded arc welding process, an arc is generated between the continuously fed welding wire and the workpiece to be welded, so that the front end of the welding wire is melted to form a droplet which is transferred to the molten pool, and the molten pool is cooled and solidified to form a weld. In the structure of the conventional gas shielded welding nozzle, the component for guiding the welding wire and transmitting the current to the welding wire is a conductive nozzle, which is generally hollow and made of brass, red copper or chromium-zirconium copper. In order to smoothly guide the welding wire, the inner diameter of the conductive nozzle is usually slightly larger than the wire diameter. When the welding wire passes through the conductive nozzle, the contact point is often not fixed, which can easily lead to instability of the arc during welding. In addition, the friction between the welding wire and the conductive nozzle during the guiding process can cause wear on the inner wall of the conductive nozzle, increasing the inner diameter and further exacerbating the poor contact between the conductive nozzle and the welding wire, arc instability and increased spatter.

[0003] A conductive nozzle assembly is disclosed in Chinese patent document CN 112264693 A, which comprises a conductive nozzle, a conductive nozzle seat, a sleeve and a pin shaft. One end of the conductive nozzle is connected to the inside of the sleeve, the sleeve is detachably fixedly connected with the conductive nozzle seat, one end of the conductive nozzle abuts against the conductive nozzle seat, and the one end of the conductive nozzle is rotatable relative to the sleeve. When the conductive nozzle is worn to the limit on one side, the conductive nozzle is rotated by a certain angle relative to the sleeve and the conductive nozzle, the unworn position of the conductive nozzle is rotated to the worn position, so that the conductive nozzle can continue to be used, greatly reducing the consumption of the conductive nozzle and saving a large amount of material and labor wasted by repeated replacement of the conductive nozzle. However, since the welding wire used in gas shielded welding has a certain amount of deflection and slack diameter, the contact position with the conductive nozzle will change during welding. Rotating the unworn position of the conductive nozzle to the worn position cannot ensure that the contact point between the welding wire and the conductive nozzle remains stable at the same position, so there is a possibility of further wear on the worn part of the conductive nozzle. In fact, it is difficult to achieve the purpose of reducing the replacement frequency of the conductive nozzle. SUMMARY

[0004] The purpose of the present application is to solve the problem of unstable arc caused by the unstable contact point between the welding conductive nozzle (referred to as welding nozzle) and the welding wire, and to improve the deposition rate of the welding wire, thereby improving the welding efficiency of gas shielded welding while ensuring the welding quality.

[0005] In order to achieve the above object, the basic technical scheme of the high deposition rate gas shielded welding nozzle of the present application is as follows: the nozzle is composed of a nozzle, a welding wire guide pipe, a multi-tooth welding wire clamp holder, a multi-tooth welding wire clamp and a flow divider.

[0006] The front end face of the nozzle inner tube is fixed in the nozzle outer tube by an insulation tube in the rear end inner hole of the tubular nozzle outer tube; the inner hole of the nozzle inner tube has an inner tube thread, and the front end face has a welding wire guide pipe hole and exhaust holes distributed around the welding wire guide pipe hole;

[0007] The welding wire guide pipe is composed of an inserted and fixed heat-insulated guide pipe body, and the rear end of the guide pipe has a pipe shoulder formed by expanding the diameter;

[0008] The multi-tooth welding wire clamp holder has a central through hole composed of a rear end tapered cavity and a front end straight-through cavity, and the tapered cavity is circumferentially surrounded by a straight-through air hole;

[0009] The multi-tooth welding wire clamp is composed of a group of elastic clamp teeth extending axially along a ring and forming a central welding wire hole by radially contracting;

[0010] The cylindrical main body of the flow divider has a front end outer thread and a rear end inner thread, and the inner thread hole is communicated with the front end welding wire through hole through a reduced-diameter tapered hole, and the reduced-diameter tapered hole is circumferentially distributed with inclined air holes;

[0011] During assembly, the guide pipe body of the welding wire guide pipe is inserted into the central welding wire guide pipe hole of the nozzle in a manner that the pipe shoulder limits the front end face of the nozzle inner tube; the multi-tooth welding wire clamp is embedded in the central through hole in a manner that the elastic clamp teeth on the outside of the multi-tooth welding wire clamp abut against the inner wall of the tapered cavity of the multi-tooth welding wire clamp holder; the outer thread of the flow divider is screwed with the inner tube thread of the nozzle, and the front end of the multi-tooth welding wire clamp holder is abutted against the pipe shoulder of the nozzle by pressing the multi-tooth welding wire clamp.

[0012] By using the present application, the single material and hollow structure of the traditional gas shielded welding electrode are changed, the electric contact points of the welding wire are fixed by the multi-tooth welding wire clamp for electric conduction, the ceramic tube is used in the welding wire guide pipe for insulation, and the welding wire has no electric contact with the welding wire guide pipe. Under the premise of ensuring the electric conduction of the welding wire, the position of the electric contact points of the welding wire is effectively ensured, the ceramic tube increases the wear resistance of the welding wire guide pipe, and prevents the inner diameter of the welding wire guide pipe from being worn. Moreover, the multi-tooth welding wire clamp is arranged inside the welding gun nozzle, the multi-tooth welding wire clamp maintains good contact with the welding wire by the elasticity between the multi-tooth welding wire clamps, and after the multi-tooth welding wire clamp is worn, the pressing force of the elastic clamp teeth is adjusted, so that the wear can be effectively compensated. In addition, through the contact between the multi-tooth welding wire clamp and the welding wire, the height of the electric conduction point of the welding wire is improved, the preheating length of the welding wire is increased, and the deposition rate of the welding wire is improved. Therefore, compared with the prior art, the present application has significant substantial features and outstanding progress.

[0013] The further improvement of the present application is that the upper edge of the ring after unfolding is first extended by gradually tapered curve segments and then by straight line segments to form at least three elastic clamping teeth with equal intervals.

[0014] The further improvement of the present application is that the at least three elastic clamping teeth are first gradually contracted radially by gradually tapered curve segments and then form a welding wire hole by straight line segments.

[0015] The further improvement of the present application is that the lower end of the welding wire hole is expanded outward.

[0016] The further improvement of the present application is that the upper end surface of the straight gas hole is lower than the upper end surface of the conical cavity.

[0017] The further improvement of the present application is that the inner diameter of the heat insulation tube is greater than the diameter of the welding wire by 0.3-1mm. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described in detail in conjunction with the embodiments given below with reference to the accompanying drawings.

[0019] Fig. 1(a) is a structural schematic diagram of an embodiment of the present application.

[0020] Fig. 1(b) is a structural schematic diagram of a nozzle in the embodiment of Fig. 1(a).

[0021] Fig. 2(a) is a structural schematic diagram of an inner cylinder of the nozzle in the embodiment of Fig. 1(a).

[0022] Fig. 2(b) is a top view of Fig. 2(a).

[0023] Fig. 3(a) is a structural schematic diagram of a welding wire guide tube in the embodiment of Fig. 1(a).

[0024] Fig. 3(b) is a top view of Fig. 3(a).

[0025] Fig. 4(a) is a structural schematic diagram of a multi-tooth welding wire clamp seat in the embodiment of Fig. 1(a).

[0026] Fig. 4(b) is a top view of Fig. 4(a).

[0027] Fig. 5(a) is a structural schematic diagram of a multi-tooth welding wire clamp unfolded in the embodiment of Fig. 1(a).

[0028] Fig. 5(b) is a side view of Fig. 5(a).

[0029] Fig. 5(c) is a structural schematic diagram of a multi-tooth welding wire clamp in the embodiment of Fig. 1(a).

[0030] Fig. 5(d) is a top view of Fig. 5(c).

[0031] Fig. 6(a) is a structural schematic diagram of a flow divider in the embodiment of Fig. 1(a).

[0032] Figure 6(b) is a top view of Figure 6(a). DETAILED DESCRIPTION

[0033] Example One

[0034] The high deposition rate gas shielded welding torch of the present embodiment is shown in Figure 1(a), which consists of a nozzle 1, a welding wire guide tube 2, a multi-tooth welding wire holder seat 3, a multi-tooth welding wire holder 4, and a flow divider 5.

[0035] The nozzle 1 is shown in Figures 1(b), 2(a), and 2(b), which consists of a front tapered tube 11 with a reduced diameter, a ceramic insulating tube 12 tightly fixed in the rear end of the tube 11, and a nozzle inner tube 13 tightly fixed in the ceramic insulating tube 12. The inner tube 13 has an inner tube thread 133, and its front end reaches the middle of the tube 11, with a central welding wire guide hole 131 and eight evenly distributed exhaust holes 132 around the welding wire guide hole.

[0036] The welding wire guide tube 2 is shown in Figures 3(a) and 3(b), which consists of a copper guide tube body 21 with a tightly fixed heat-insulating ceramic tube 22. The rear end of the guide tube body 21 has an expanded tube shoulder 211. In order to ensure smooth welding wire passage and stable arc during welding, the inner diameter of the ceramic tube 22 is 0.3-1 mm larger than the diameter of the welding wire.

[0037] The multi-tooth welding wire holder seat 3 is shown in Figures 4(a) and 4(b), which has a central through hole consisting of a tapered cavity 32 and a straight-through cavity 33. The angle of the tapered cavity 32 is 30°, and there are six straight-through air holes 31 around the periphery.

[0038] The multi-tooth welding wire holder 4 is shown in Figures 5(a)-5(d), which is made of hard alloy copper and consists of six elastic holder teeth 41 extending axially along the ring and radially contracting to form a central welding wire hole 42. As shown in Figure 5(a), the six elastic holder teeth 41 are first extended with a tapered curve segment 4.1 and then with a straight line segment 4.2 to form the welding wire hole 42. The upper edge of the holder is bent to form a regular hexagonal ring, and the six elastic holder teeth 41 are first gradually radially contracted with the tapered curve segment 4.1 and then formed with the straight line segment 4.2 to form the welding wire hole 42, with the lower end of the welding wire hole 42 expanding outward. By adjusting the contraction degree of the elastic holder teeth 41, the size of the welding wire hole 42 can be changed to adapt to different wire diameters.

[0039] The flow distributor 5 has a cylindrical body with an external thread 53 at the front end and an internal thread 54 at the rear end for connecting with the welding torch, and the internal threaded hole is communicated with the welding wire through hole 51 at the front end through a tapered hole with a reduced diameter, and six inclined air holes 52 are uniformly distributed around the tapered hole with a reduced diameter.

[0040] After assembly, as shown in Fig. 1(a), the conduit body 21 of the welding wire conduit is inserted into the central welding wire conduit hole 131 of the nozzle in such a way that the pipe shoulder 211 is limited to the front end face of the nozzle inner cylinder; the multi-tooth welding wire clamp is embedded in the central through hole in such a way that the outer side of the elastic clamp tooth 41 abuts against the inner wall of the multi-tooth welding wire clamp seat tapered cavity 32; the external thread 53 of the flow distributor is screwed with the inner cylinder thread 133 of the nozzle, and the front end of the multi-tooth welding wire clamp seat 3 is abutted against the pipe shoulder of the nozzle by pressing the multi-tooth welding wire clamp.

[0041] When welding, the welding wire passes through the welding wire through hole 51, enters the multi-tooth welding wire clamp 4, passes through the welding wire hole 42, enters the ceramic tube 22, and finally passes out of the nozzle 1; the shielding gas enters the flow distributor 5, then enters the nozzle inner cylinder 13 through the welding wire through hole 51 and the inclined air hole 52, and then passes through the straight air hole 31, the tapered cavity 32, and the straight cavity 33 before being discharged through the exhaust hole 132 to form protection for the electric arc; the teeth 41 of the multi-tooth welding wire clamp 4 clamp the welding wire, fixing the electrically conductive point of the welding wire without reducing the electrical conductivity, while the ceramic tube 22 in the welding wire conduit 2 can effectively increase the wear resistance of the welding wire conduit 2, and play a good guiding role for the welding wire, avoiding spatter caused by unstable wire feeding, and the ceramic tube 22 insulates the welding wire from the conduit copper pipe 21, avoiding the occurrence of another electrically conductive point of the welding wire in the welding wire conduit 2, and the fixation of the electrically conductive point of the welding wire plays a role in stabilizing the electric arc, so that when welding is performed using the present application, the electrically conductive point of the welding wire is fixed at the welding wire hole 42 formed by the teeth 41, and there is no electrically conductive point at other positions of the welding wire, and the electrically conductive point is higher than the position of the electrically conductive point when using a conventional welding tip, so that when welding is performed using the present embodiment, the dry elongation of the welding wire is lengthened, resulting in an increase in the resistance heat of the welding wire, and thus the deposition rate of the welding wire is improved.

[0042] Tests show that the use of the present embodiment can make the electric arc more stable during welding, reduce the consumption of the welding conducting nozzle, improve the welding efficiency, and overall reduce the welding cost.

[0043] In addition to the above embodiments, the present application can also have other embodiments. Any technical solution formed by equivalent substitution or equivalent transformation falls within the scope of protection required by the present application.

Claims

1. A high deposition rate gas-shielded welding nozzle, characterized in that: It consists of a nozzle (1), a welding wire guide (2), a multi-tooth welding wire holder (3), a multi-tooth welding wire clamp (4), and a distributor (5); the nozzle has a tubular nozzle outer cylinder (11) with an insulating cylinder (12) in the inner hole at the rear end, which fixes the front end face of the nozzle inner cylinder (13) in the outer cylinder; the inner hole of the nozzle inner cylinder has an inner cylinder thread (133), and the front end face has a welding wire guide hole (131) and an exhaust hole (132) distributed around the welding wire guide hole; the welding wire guide is composed of a guide body (21) for inserting and fixing an insulating ceramic tube (22), and the rear end of the guide body has a tube shoulder (211) formed by expanding the diameter; the multi-tooth welding wire holder has a central through hole composed of a rear conical cavity (32) and a front straight cavity (33), and the conical cavity (32) is surrounded by a straight vent hole (31) in the outer circumference; the multi-tooth welding wire clamp is composed of a tube body (21) for inserting and fixing an insulating ceramic tube (22), and the rear end of the guide body has a tube shoulder (211) formed by expanding the diameter; the multi-tooth welding wire holder ... clamp is composed of a tube body (21) for inserting and fixing an insulating ceramic tube (22), and the rear end of the guide body has a tube shoulder (211) for inserting and fixing a tube body (21) for inserting and fixing a tube body (21) for inserting and fixing a tube body (21) for inserting and fixing a tube body (21) for inserting A set of elastic clamping teeth (41) radially converges to form a central welding wire hole (42); the cylindrical body of the distributor has an external thread (53) at the front end and an internal thread (54) at the rear end. The internal thread hole is connected to the welding wire through hole (51) at the front end through a tapered hole with a reduced diameter. The tapered hole with oblique ventilation holes (52) is distributed circumferentially. During assembly, the guide body (21) of the welding wire guide is inserted into the welding wire guide hole (131) of the nozzle with the shoulder (211) positioned at the front end face of the inner cylinder of the nozzle. The multi-tooth welding wire clamp is embedded in the central through hole with the outer side of the elastic clamping teeth (41) abutting against the inner wall of the tapered cavity (32) of the multi-tooth welding wire clamp seat. The external thread (53) of the distributor is screwed into the inner cylinder thread (133) of the nozzle. By pressing the multi-tooth welding wire clamp, the front end of the multi-tooth welding wire clamp seat (3) abuts against the shoulder of the nozzle.

2. The high deposition rate gas-shielded welding nozzle according to claim 1, characterized in that: After the ring is unfolded, the top edge extends downwards first with a gradually narrowing curve segment, and then with a straight line segment to form at least three equally spaced elastic clamping teeth. The top edge is then bent to form a regular polygonal ring.

3. The high deposition rate gas-shielded welding nozzle according to claim 2, characterized in that: The at least three elastic clamping teeth first gradually converge radially with a tapered curve segment, and then form a welding wire hole with a straight line segment.

4. The high deposition rate gas-shielded welding nozzle according to claim 3, characterized in that: The lower end of the welding wire hole extends outward.

5. The high deposition rate gas-shielded welding nozzle according to claim 4, characterized in that: The upper surface of the straight vent is lower than the upper surface of the conical cavity.

6. The high deposition rate gas-shielded welding nozzle according to any one of claims 1 to 5, characterized in that: The inner diameter of the insulating ceramic tube is 0.3~1mm larger than the diameter of the welding wire.

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