CN219005005U - Resistance heat auxiliary welding device - Google Patents

Abstract

The utility model provides a resistance heat auxiliary welding device, which comprises: the welding machine comprises a resistance welding electrode, a welding machine frame, a first welding head and a welding seat assembly, wherein the first welding head is arranged at the output end of a first welding head driving piece through a first welding head connecting block and is in sliding fit with the welding machine frame, and the first electrode is electrically connected with the input end of the first welding head; the welding seat assembly is arranged on the welding machine frame and comprises a second welding head for bearing a foil material and a second welding head fixing seat, wherein the second welding head is used for transmitting ultrasonic energy which is 180 degrees different from the ultrasonic electric angle phase angle of the first welding head, the second welding head is fixed on the welding machine frame through the second welding head fixing seat in an insulating manner, and a second electrode is electrically connected with the input end of the second welding head; the first welding head is positioned above the second welding head, and the second welding end of the first welding head is opposite to the second welding end of the second welding head from top to bottom. The utility model has the characteristics of low damage, low power, high environmental protection, good performance, convenient installation and the like by auxiliary heating of resistance heat before ultrasonic welding.

Description

Resistance heat auxiliary welding device

Technical Field

The utility model relates to the technical field of welding, in particular to a resistance heat auxiliary welding device.

Background

The metal welding is to convert high-frequency vibration energy into friction energy, deformation and temperature rise between workpieces, so that the welded workpieces generate mutual plastic flow to realize metal combination between the workpieces, and the welding mode is solid-phase metal welding, namely, the welding temperature is lower than the melting point. When the thickness or contact area of the welded workpiece is increased, high-quality welding is realized through the control of parameters such as amplitude, energy, pressure and the like. Because friction vibration is contact friction vibration welding, a welding workpiece subjected to pressure and vibration causes workpiece damage due to increased parameters, the service life of an ultrasonic welding head welding seat is reduced, and welding power is limited by the power of an ultrasonic transducer and cannot be infinitely improved. The traditional resistance welding is to apply current to the workpiece, and the instant heat generated by the current can quickly generate high temperature higher than the melting point, so that the welding core is formed in the welding workpiece, and the welding method is a molten metal welding method. How to use the transformer output current loop of resistance welding above ultrasonic metal spot welder mechanism to can realize utilizing the welding work characteristic of resistance welding to realize the heating temperature rise to welding the product before the welding to ultrasonic metal welded product, accomplish ultrasonic metal welded process to the product and not influence, utilize the more accurate temperature control to the metal product heating temperature rise that needs the heating welding of working characteristic of resistance welding. In the process of introducing resistance heat energy into ultrasonic welding, a scheme shared by a welding head and a resistance welding electrode is used, and because the welding head integrally vibrates, the frequency and vibration characteristics of the welding head can be changed due to the fact that the connection position of the resistance welding electrode and the welding head is improper, and the defect that the amplitude output characteristics of a welding spot area no longer meet the requirements exists.

Disclosure of Invention

The utility model mainly aims to solve the problems in the prior art, provides a resistance heat auxiliary welding device which is provided with an upper welding head and a lower welding head and is connected with an electrode by a enclasping block arranged at the welding end of the welding head, and aims to solve the problems in the prior ultrasonic welding device.

The technical scheme adopted by the utility model is as follows:

the utility model provides a resistance heat auxiliary welding device, which comprises:

a resistance welding electrode including a first electrode and a second electrode;

the welding machine frame comprises a first welding head driving piece for providing ultrasound and driving a first welding head to move and a first welding head connecting block which is positioned at the output end of the first welding head driving piece and is connected with the first welding end of the first welding head;

the first welding head is used for transmitting ultrasonic energy and comprises a first welding head input end, a first welding head first welding end and a first welding head second welding end, the first welding head is arranged at the output end of the first welding head driving piece through a first welding head connecting block and is in sliding fit with the welding machine frame, and the first electrode is electrically connected with the first welding head input end;

the welding seat assembly is used for being matched with the first welding head, is installed on the welding machine frame and comprises a second welding head used for bearing foil materials and a second welding head fixing seat, the second welding head is used for transmitting ultrasonic energy which is 180 degrees different from the ultrasonic electric angle phase angle of the first welding head, the welding seat assembly comprises a second welding head incoming end, a second welding head first welding end and a second welding head second welding end, the second welding head is fixed on the welding machine frame in an insulating mode through the second welding head fixing seat, and the second electrode is electrically connected with the second welding head incoming end; the first welding head is positioned above the second welding head, and the second welding end of the first welding head is opposite to the second welding end of the second welding head from top to bottom.

Further, the first electrode further comprises a first enclasping block fixedly connected with the input end of the first welding head, a first electrode wiring terminal and a first electrode connecting line, one side of the first enclasping block is fixedly connected with the input end of the first welding head in a surrounding mode, and the other side of the first enclasping block is sequentially connected with the first electrode wiring terminal and the first electrode connecting line.

Further, the first enclasping block is fixedly connected with the first welding head incoming end at a first welding head incoming end node.

Further, the first enclasping block comprises a first movable enclasping block, a first fixed enclasping block and a first enclasping block fixing screw, the inner side of the first movable enclasping block and the first fixed enclasping block after being fixed and spliced by the first enclasping block fixing screw is a round hole, the outer side of the incoming end of the first welding head is round, and the inner side of the first fixed enclasping block is fixed in contact with the outer side of the incoming end of the first welding head.

Further, a first groove is formed in one end, facing the first welding end of the first welding head, of the first connecting block, the first welding end of the first welding head is placed at the first groove, a first through hole is formed in the first welding head connecting block, a second through hole is formed in the first welding end of the first welding head, the first welding head connecting block further comprises a first pin shaft penetrating through the first through hole and the second through hole, and a first pin shaft end fixing screw located at one end of the first pin shaft and used for fixing the first pin shaft on one side of the first welding head connecting block.

Further, the second electrode further comprises a second enclasping block fixedly connected with the incoming end of the second welding head, a second electrode binding post and a second electrode connecting wire, one side of the second enclasping block is fixedly connected with the incoming end of the second welding head in a surrounding mode, and the other side of the second enclasping block is sequentially connected with the second electrode binding post and the second electrode connecting wire.

Further, the second enclasping block is fixedly connected with the second welding head incoming end at a second welding head incoming end node.

Further, the second enclasping block comprises a second movable enclasping block, a second fixed enclasping block and a second enclasping block fixing screw, the inner side of the second movable enclasping block and the second fixed enclasping block after being fixed and spliced by the second enclasping block fixing screw is a round hole, the outer side of the incoming end of the second welding head is round, and the inner side of the second fixed enclasping block is fixed in contact with the outer side of the incoming end of the second welding head.

Further, the device also comprises a first cooling system formed by sequentially connecting a first cooling liquid inlet, a first water inlet pipe adapter, a first cooling liquid channel, a first water outlet pipe adapter and a first cooling liquid outlet, wherein the first cooling liquid channel is arranged in the first fixed enclasping block; the device also comprises a second cooling system which is formed by sequentially connecting a second cooling liquid inlet, a second water inlet pipe adapter, a second cooling liquid channel, a second water outlet pipe adapter and a second cooling liquid outlet, wherein the second cooling liquid channel is arranged inside the second fixed enclasping block.

Further, the weld holder assembly is provided with an insulating block between the second weld head mount and the welder frame.

From the above technical scheme, the utility model has the following advantages: 1) The positive electrode and the negative electrode are connected at the node of the inlet end of the upper welding head and the lower welding head by utilizing the enclasping blocks, so that the welding head has the characteristics of small influence on the frequency and the vibration characteristics of the welding heads and convenience in assembly; 2) The service lives of the first welding head and the second welding head are prolonged through cooling of the upper cooling system and the lower cooling system; 3) The upper welding head and the lower welding head vibrate simultaneously, so that the same equipment can output higher power and has high efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings used in the description of the embodiments and the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a resistance heat auxiliary welding device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of upper and lower welding heads of a resistance heat auxiliary welding device according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a enclasping block of an upper welding head according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a lower welding head enclasping block according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a lower welding head enclasping block according to an embodiment of the present utility model.

Reference numerals:

1. a resistance welding electrode; 11. a first electrode; 111. a first electrode wire; 112. a first electrode connection terminal; 113. a first clasping block; 1131. the first movable enclasping block; 1132. the first fixed enclasping block; 1133. the first enclasping block is used for fixing the screw; 12. a second electrode; 121. a second electrode connection line; 123. a second enclasping block; 1231. the second movable enclasping block; 1232. the second fixed enclasping block;

2. a welder frame; 21. a first welding head connecting block; 211. a first through hole; 212. a first groove; 213. a first pin shaft end fixing screw; 214. a first pin;

3. a first welding head; 31. a first weld head entrance end; 32. a first welding end of the first welding head; 33. the first welding head is provided with a second welding end;

4. a weld holder assembly; 41. a second welding head; 411. the second welding head is connected with the inlet end of the first welding head; 412. a second welding head first welding end; 413. a second welding end of the second welding head; 42. the second welding head fixing seat; 421. a second through hole; 422. a second groove; 43. an insulating block;

5. a first cooling system; 51. a first coolant inlet; 52. a first coolant outlet; 54. the first water inlet pipe adapter; 55. a first outlet pipe adapter;

6. a second cooling system; 61. a second coolant inlet; 62. a second cooling liquid outlet, 64, a second water inlet pipe adapter; 65. the second water outlet pipe adapter;

7. and (5) welding the sheet.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

The terms first, second, third and the like in the description and in the claims and in the above drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

The following describes the embodiments of the present utility model in detail by way of specific examples.

Referring to fig. 1-5, a resistance heat assisted welding apparatus comprising:

a resistance welding electrode 1 including a first electrode 11 and a second electrode 12;

as an embodiment, the first electrode 11 further includes a first enclasping block 113 fixedly connected to the first welding head incoming end 31, a first electrode connection terminal 112, and a first electrode connection line 111, one side of the first enclasping block 113 is fixedly connected around the first welding head incoming end 31, and the other side of the first enclasping block 113 is sequentially connected to the first electrode connection terminal 112 and the first electrode connection line 111. Preferably, the first enclasping block 113 is fixedly connected to the first weld head inlet 31 at a node of the first weld head inlet 31, which reduces the impact on weld head vibration. The first enclasping block 113 comprises a first movable enclasping block 1131, a first fixed enclasping block 1132 and a first enclasping block fixing screw 1133, wherein the inner side of the first movable enclasping block 1131 and the first fixed enclasping block 1132 is a round hole after being fixedly spliced through the first enclasping block fixing screw 1133, the outer side of the first welding head incoming end 31 is round, and the inner side of the first fixed enclasping block 1132 is fixedly contacted with the outer side of the first welding head incoming end 31. The second electrode 12 further includes a second holding block 123 fixedly connected to the second welding head incoming end 411, a second electrode connection terminal (not shown in the figure), and a second electrode connection line 121, one side of the second holding block 123 is fixedly connected around the second welding head incoming end 411, and the other side of the second holding block 123 is sequentially connected to the second electrode connection terminal and the second electrode connection line 121. Preferably, the second enclasping block 123 is fixedly connected to the second weld head entrance end 411 at a node of the second weld head entrance end 411, which reduces the impact on weld head vibration. The second enclasping block 123 includes a second movable enclasping block 1231, a second fixed enclasping block 1232, and a second enclasping block fixing screw (not shown in the figure), where the second movable enclasping block 1231 and the second fixed enclasping block 1232 are fixed and spliced by the second enclasping block fixing screw, and the inner side is a circular hole, the outer side of the second welding head incoming end 411 is a circular shape, and the inner side of the second fixed enclasping block 1232 is fixed in contact with the outer side of the second welding head incoming end 411. The enclasping blocks are movably arranged, so that the enclasping blocks are convenient to assemble and disassemble.

The loop flow of the current is as follows: the positive electrode output end (not shown in the figure) of the resistance welding transformer system, the first electrode connecting wire 111, the first electrode connecting wire 112, the first fixed enclasping block 1132, the first welding head 3, the to-be-welded sheet 7, the second welding head 41, the second fixed enclasping block 1232, the second electrode connecting wire 121 and the negative electrode (not shown in the figure) of the resistance welding transformer system.

A welder frame 2 comprising a first horn drive (not shown) for providing ultrasound and driving the movement of a first horn 3 and a first horn connection block 21 at the output of said first horn drive and connected to a first horn first welding end 32;

the first welding head 3 is used for transmitting ultrasonic energy and comprises a first welding head incoming end 31, a first welding head first welding end 32 and a first welding head second welding end 33, the first welding head 3 is mounted at the output end of the first welding head driving piece through a first welding head connecting block 21 and is in sliding fit with the welding machine frame 2, and the first electrode 11 is electrically connected with the first welding head incoming end 31; the first connecting block 21 is provided with a first groove 212 towards one end of a first welding head first welding end 32, the first welding head first welding end 32 is placed at the first groove 212, the first welding head connecting block 21 is provided with a first through hole 211, the first welding head first welding end 32 is provided with a second through hole, the first welding head connecting block 21 further comprises a first pin shaft 214 penetrating through the first through hole 211 and the second through hole and a first pin shaft end fixing screw 213 positioned at one end of the first pin shaft 214 and used for fixing the first pin shaft 214 at one side of the first welding head connecting block 21.

The welding seat assembly 4 is used for being matched with the first welding head 3, the welding seat assembly 4 is mounted on the welding machine frame 2 and comprises a second welding head 41 used for bearing foil materials and a second welding head fixing seat 42, the second welding head 41 is used for transmitting ultrasonic energy which is 180 degrees different from the ultrasonic electric angle phase angle of the first welding head 3, the welding seat assembly comprises a second welding head incoming end 411, a second welding head first welding end 412 and a second welding head second welding end 413, the second welding head 41 is fixed on the welding machine frame 2 in an insulating manner through the second welding head fixing seat 42, the second electrode 12 is electrically connected with the second welding head incoming end 411, and the second welding head fixing seat 42 is an ultrasonic lower welding head mounting device used for providing mechanical rigidity; the first welding head 3 is positioned above the second welding head 41 with the first welding head second welding end 33 being vertically opposite the second welding head second welding end 413. The second welding head fixing base 42 is provided with a second groove 422 towards one end of the first welding head end 412, the first welding head end 412 is placed at the second groove 422, the second welding head fixing base 42 is provided with a second through hole 421, the first welding head end 412 is provided with a third through hole (not shown in the figure), the second welding head fixing base 42 further comprises a second pin shaft (not shown in the figure) penetrating through the second through hole 421 and the third through hole, and a second pin shaft end fixing screw (not shown in the figure) located at one end of the second pin shaft and used for fixing the second pin shaft at one side of the second welding head fixing base 42. The first welding head 3 and the second welding head 41 vibrate in opposite directions, improving welding efficiency.

As an embodiment, the device further comprises a first cooling system 5 formed by sequentially connecting a first cooling liquid inlet 51, a first water inlet pipe adapter 54, a first cooling liquid channel (not shown in the figure), a first water outlet pipe adapter 55 and a first cooling liquid outlet 52, wherein the first cooling liquid channel is arranged inside the first fixed enclasping block 1132; the second cooling system 6 is formed by sequentially connecting a second cooling liquid inlet 61, a second water inlet pipe adapter 64, a second cooling liquid channel (not shown in the figure), a second water outlet pipe adapter 65 and a second cooling liquid outlet 62, wherein the second cooling liquid channel is arranged inside the second fixed enclasping block 1232. Cooling water flows out from the cooling water outlets of the upper welding head and the lower welding head through the upper welding head and the lower welding head fixing enclasping blocks, so that the processing waste heat of the upper welding head and the lower welding head is taken away, the upper welding head and the lower welding head are better protected to be in a proper constant temperature state for a long time, the service lives of the upper welding head and the lower welding head are ensured, and the production cost and the utilization rate are reduced to the maximum.

The welding seat assembly 4 is provided with an insulating block 43 between the second welding head fixing seat 42 and the welding machine frame 2, so as to ensure that the positive electrode and the negative electrode are not short-circuited.

The specific working steps are as follows:

and (3) a pre-pressing stage: by means of the trigger signal, the ultrasonic welder drives the motion mechanism to lower the upper welding head to press the workpiece on the lower welding head and to provide continuous pressure. The welding workpiece can be made of copper, nickel, copper nickel plating, aluminum or a combination thereof.

Resistance preheating work piece stage: the welding current is 0-20000A, the welding time is 0-2000 ms, after the pre-pressing stage is completed, the current is triggered to be conducted, the current is transmitted to the clamped workpiece to be welded and the lower welding head through the upper welding head, then the current is conducted through the lower electrode, and the conduction of a current loop is realized by adding a protective insulating mechanism. When the resistance current is conducted, the contact resistance of the welding workpiece generates heat and resistance heat, so that the preheating effect of the workpiece before ultrasonic welding is realized. After the resistance preheating, the temperature of the workpiece is improved, and the plastic flow and deformation capacity is greatly improved. Ultrasonic welding may be triggered during or after the resistive heating sequence.

Ultrasonic welding: the ultrasonic welding machine module is preset with parameters, the welding machine can be provided with an energy mode and a time mode, and the parameters in the energy mode are as follows: welding amplitude is 0-72 um, welding energy is 0-2000J, and welding pressure is 0-0.6 MPa; parameters in temporal mode: welding amplitude is 0-72 um, and welding time is 0-5 s; the welding pressure is 0-0.6 MPa; triggering to ultrasonic welding to carry out ultrasonic welding when the resistance and ultrasonic parameters are preset, and connecting welding workpieces under ultrasonic vibration friction. The preheated workpiece is easier to weld during ultrasonic welding, and often the required ultrasonic welding parameters are smaller than those during resistance-free preheating, so that the abrasion of an upper welding head and a lower welding head can be reduced, the service life of the welding head is prolonged, the damage of ultrasonic vibration to the workpiece is reduced, the welding quality is improved, and the high-quality and long-service-life ultrasonic welding connection is realized.

Pressure unloading stage: after the ultrasonic welding stage is completed, the signal triggers the ultrasonic frame movement mechanism to drive the upper welding head to lift. Meanwhile, the upper welding head is preset with secondary ultrasonic parameters, so that the welding workpiece is smoothly separated from the upper welding head, and the adhesion is prevented.

The ultrasonic metal welding utilizes the output current of a resistance welding transformer, and the current is conveyed to the working end face of the welding head through the upper welding head node enclasping block. When the upper welding head compresses tightly the material to be welded in a descending way, the output current of the resistance welding transformer passes through the metal foil to be welded to reach the cathode of the lower welding head, so that the resistance heat energy characteristic generated by the material to be welded area of the welding product is improved to a specified value in an instant, then the ultrasonic metal welding host system emits ultrasonic waves, the ultrasonic waves respectively pass through the upper energy converter amplitude transformer to reach the upper welding head, and meanwhile pass through the lower energy converter amplitude transformer to reach the lower welding head (the two welding heads receive the ultrasonic waves, and the ultrasonic waves with 180-degree phase angle difference of the electrical angles of the ultrasonic waves) and then the welding is completed under the action of ultrasonic friction.

The structure of each part of the upper welding head and the lower welding head is changed, so that the welding process is improved, various energy parameters of the ultrasonic welding machine are reduced, the additional value of equipment is improved, the energy consumption of the welding machine is reduced, the structure is simple, the maintenance is more convenient, and the stability is better in the welding process. The heating device is internally provided with a water cooling device, and the residual temperature generated by the upper welding head and the lower welding head is cooled by water in time in the production process, so that the service lives of the upper welding head and the lower welding head are prolonged.

The technical scheme of the utility model is described in detail through the specific embodiments. In the foregoing embodiments, the descriptions of the embodiments are each focused, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.

It should be understood that the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting. Modifications of the technical solutions described in the above embodiments or equivalent substitutions of some technical features thereof may be made by those skilled in the art; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. A resistance heat assisted welding apparatus, comprising:

a resistance welding electrode (1) comprising a first electrode (11) and a second electrode (12);

a welding machine frame (2) comprising a first welding head driving piece for providing ultrasound and driving a first welding head (3) to move and a first welding head connecting block (21) which is positioned at the output end of the first welding head driving piece and is connected with a first welding end (32) of the first welding head;

the first welding head (3) is used for transmitting ultrasonic energy and comprises a first welding head input end (31), a first welding head first welding end (32) and a first welding head second welding end (33), the first welding head (3) is arranged at the output end of the first welding head driving piece through a first welding head connecting block (21) and is in sliding fit with the welding machine frame (2), and the first electrode (11) is electrically connected with the first welding head input end (31);

the welding seat assembly (4) is used for being matched with the first welding head (3), the welding seat assembly (4) is mounted on the welding machine frame (2), the welding seat assembly comprises a second welding head (41) used for bearing foil materials and a second welding head fixing seat (42), the second welding head (41) is used for transmitting ultrasonic energy which is 180 degrees different from an ultrasonic electric angle phase angle of the first welding head (3), the welding seat assembly comprises a second welding head incoming end (411), a second welding head first welding end (412) and a second welding head second welding end (413), the second welding head (41) is fixed on the welding machine frame (2) in an insulating mode through the second welding head fixing seat (42), and the second electrode (12) is electrically connected with the second welding head incoming end (411); the first welding head (3) is positioned above the second welding head (41), and the second welding end (33) of the first welding head is opposite to the second welding end (413) of the second welding head in a vertical direction.

2. The resistance heat auxiliary welding device according to claim 1, wherein the first electrode (11) further comprises a first enclasping block (113) fixedly connected with the first welding head incoming end (31), a first electrode connecting terminal (112) and a first electrode connecting wire (111), one side of the first enclasping block (113) is fixedly connected around the first welding head incoming end (31), and the other side of the first enclasping block (113) is sequentially connected with the first electrode connecting terminal (112) and the first electrode connecting wire (111).

3. The resistance heat assist welding apparatus as set forth in claim 2 wherein said first hug block (113) is fixedly connected to said first weld head inlet end (31) at a node of said first weld head inlet end (31).

4. A resistance heat auxiliary welding device according to claim 3, wherein the first enclasping block (113) comprises a first movable enclasping block (1131), a first fixed enclasping block (1132) and a first enclasping block fixing screw (1133), the inner side of the first movable enclasping block (1131) and the first fixed enclasping block (1132) is a round hole after being fixedly spliced through the first enclasping block fixing screw (1133), the outer side of the first welding head incoming end (31) is round, and the inner side of the first fixed enclasping block (1132) is in contact fixation with the outer side of the first welding head incoming end (31).

5. The resistance heat auxiliary welding device according to claim 1, wherein the first welding head connecting block (21) is provided with a first groove (212) towards one end of a first welding head first welding end (32), the first welding head first welding end (32) is placed at the first groove (212), the first welding head connecting block (21) is provided with a first through hole (211), the first welding head first welding end (32) is provided with a second through hole, the first welding head connecting block (21) further comprises a first pin shaft (214) penetrating through the first through hole (211) and the second through hole and a first pin shaft end fixing screw (213) which is positioned at one end of the first pin shaft (214) and used for fixing the first pin shaft (214) on one side of the first welding head connecting block (21).

6. The resistance heat auxiliary welding device according to claim 4, wherein the second electrode (12) further comprises a second enclasping block (123) fixedly connected with the second welding head incoming end (411), a second electrode connecting terminal and a second electrode connecting wire (121), one side of the second enclasping block (123) is fixedly connected around the second welding head incoming end (411), and the other side of the second enclasping block (123) is sequentially connected with the second electrode connecting terminal and the second electrode connecting wire (121).

7. The resistance heat assist welding apparatus as set forth in claim 6 wherein said second hug block (123) is fixedly connected to said second weld head inlet end (411) at a node of said second weld head inlet end (411).

8. The resistance heat auxiliary welding device according to claim 7, wherein the second enclasping block (123) comprises a second movable enclasping block (1231), a second fixed enclasping block (1232) and a second enclasping block fixing screw, the inner side of the second movable enclasping block (1231) and the second fixed enclasping block (1232) is a round hole after being fixedly spliced by the second enclasping block fixing screw, the outer side of the second welding head incoming end (411) is round, and the inner side of the second fixed enclasping block (1232) is in contact fixation with the outer side of the second welding head incoming end (411).

9. The resistance heat auxiliary welding device according to claim 8, further comprising a first cooling system (5) formed by sequentially connecting a first cooling liquid inlet (51), a first water inlet pipe adapter (54), a first cooling liquid channel, a first water outlet pipe adapter (55) and a first cooling liquid outlet (52), wherein the first cooling liquid channel is arranged inside the first fixed enclasping block (1132); the cooling device further comprises a second cooling system (6) which is formed by sequentially connecting a second cooling liquid inlet (61), a second water inlet pipe adapter (64), a second cooling liquid channel, a second water outlet pipe adapter (65) and a second cooling liquid outlet (62), wherein the second cooling liquid channel is arranged in the second fixed enclasping block (1232).

10. The resistance heat auxiliary welding apparatus according to claim 1, wherein the weld holder assembly (4) is provided with an insulating block (43) between the second weld head holder (42) and the welder frame (2).

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