CN219005008U - 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 welding head and a welding seat assembly, wherein a seam extending to the near top is formed in the middle of the welding seat from the bottom upwards, a first column containing cavity for containing a conductive column in the first welding seat is formed in one side of the welding seat, a second column containing cavity for containing a conductive column in the second welding seat is formed in the other side of the welding seat, a fixing seat is used for supporting the welding seat and fixedly and insulating the welding seat with the welding machine frame through a second insulating plate, a third column containing cavity for containing a first electrode telescopic column is formed in one side of the welding seat, and a fourth column containing cavity for containing a second electrode telescopic column is formed in the other side of the welding seat. The utility model has the characteristics of low damage, low power, high environmental protection, good performance, low cost 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 aims to solve the problems of the prior art and provides a resistance heat auxiliary welding device which utilizes a left current claw and a right current claw to connect electrodes, and aims to solve the problems of 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:

the resistance welding electrode comprises a first electrode and a second electrode, wherein the first electrode comprises a first electrode connecting wire, a first electrode conducting rod, a first electrode telescopic column and a first welding seat inner conducting column which are connected in sequence, and the second electrode comprises a second electrode connecting wire, a second electrode conducting rod, a second electrode telescopic column and a second welding seat inner conducting column which are connected in sequence;

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

the welding head is used for transmitting ultrasonic energy and comprises an incoming end, a first welding end and a second welding end, and is arranged at the output end of the welding head driving piece and is in sliding fit with the welding machine frame;

the welding seat assembly is used for being matched with the welding head, the welding seat assembly is installed on the welding machine frame and comprises a welding seat and a fixing seat, wherein the welding seat is used for bearing foil materials, the welding seat is located below the second welding end, a seam extending to the position close to the top is formed in the middle of the welding seat from the bottom to the upper side, a first column containing cavity for containing a conductive column in the first welding seat is formed in one side of the welding seat, a second Rong Zhuqiang for containing the conductive column in the second welding seat is formed in the other side of the welding seat, the fixing seat is used for supporting the welding seat and is fixedly and insulatively connected with the welding machine frame through a second insulating plate, a third column containing cavity for containing a first electrode telescopic column is formed in one side of the welding seat, a fourth column containing cavity for containing a second electrode telescopic column is formed in the other side of the welding seat, a first insulating rubber tube is arranged between the first electrode telescopic column and the third column containing cavity, and a second insulating rubber tube is arranged between the second electrode telescopic column and the fourth column containing cavity.

Further, the connecting block is opened towards first welding end one end has the recess, and first welding end is placed in recess department, and the connecting block is equipped with the round pin shaft hole, and first welding end is equipped with the through-hole, passes the round pin axle hole through-hole through the round pin axle and fixes bonding tool and connecting block.

Further, a first insulating plate or insulating glue is filled in the middle seam of the welding seat.

Further, a piece is dug out at two sides of the bottom seam in the middle of the welding seat, and is filled with insulating fixing blocks, so that the left part and the right part of the welding seat are fixed.

Further, fixing base bottom is equipped with the fixing base bottom plate, first electrode still contains the cover and establishes the first spring in the outside of the flexible post of first electrode, and first electrode flexible post middle part is equipped with outside protruding portion, and first spring one end top is at the fixing base bottom plate, and the other end top is at first electrode flexible post protruding lower extreme, the second electrode still contains the cover and establishes the second spring in the outside of the flexible post of second electrode, and second electrode flexible post middle part is equipped with outside protruding portion, and second spring one end top is at the fixing base bottom plate, and the other end top is at the flexible post protruding lower extreme of second electrode.

Further, a first spring air-isolating ring is arranged between the first spring and the lower end of the protruding part of the first electrode telescopic column, and a second spring air-isolating ring is arranged between the second spring and the lower end of the protruding part of the second electrode telescopic column.

Further, the electrode structure further comprises a first insulating gasket sleeved outside the first electrode telescopic column and positioned on the upper side of the protruding part of the first electrode telescopic column, and a second insulating gasket sleeved outside the second electrode telescopic column and positioned on the upper side of the protruding part of the second electrode telescopic column.

Further, the fixing base comprises a first fixing base fixing body, a second fixing base fixing body and a fixing base fixing plate, the first fixing base fixing body and the second fixing base fixing body are separated, the first fixing base fixing body and the second fixing base fixing body are connected with the fixing base fixing plate through a second insulating plate, and the fixing base fixing plate is fixedly connected with the frame.

Further, the welding seat assembly air cooling system comprises a first air cooling system and a second air cooling system, wherein the first air cooling system comprises a first air inlet interface, a first air cooling channel and a second air cooling channel, the first air cooling channel is arranged in a first electrode telescopic column, the second air cooling channel is arranged in a first welding seat inner conductive column, the second air cooling system comprises a second air inlet interface, a third air cooling channel and a fourth air cooling channel, the second air inlet interface is sequentially communicated with the third air cooling channel is arranged in a second electrode telescopic column, and the fourth air cooling channel is arranged in a second welding seat inner conductive column.

Further, the welding device also comprises an amplitude transformer connected with the incoming end, an amplitude transformer fixing ring arranged at the outer side of the amplitude transformer, an amplitude transformer fixing screw for fixing the incoming end and the amplitude transformer, a third air inlet port, a fifth air cooling channel, a sixth air cooling channel, a seventh air cooling channel, an eighth air cooling channel, a ninth air cooling channel and a tenth air cooling channel, wherein the third air inlet port is communicated with the amplitude transformer fixing ring, the sixth air cooling channel is arranged between the amplitude transformer fixing ring and the amplitude transformer, the seventh air cooling channel is arranged in the amplitude transformer, the eighth air cooling channel is arranged in the amplitude transformer fixing screw, the ninth air cooling channel is arranged in the incoming end, the tenth air cooling channel is arranged in the second welding end, a zero hole is formed in the vibration static position of the second welding end, one end of the tenth air cooling channel is communicated with the zero hole, and an air passage plug is arranged at the position of the other end, which leads to the outer side of the welding head.

From the above technical scheme, the utility model has the following advantages: 1) The electrode is connected left and right by the welding seat, so that the welding device has the characteristics of no influence on welding frequency and vibration characteristics and convenience in assembly; 2) The welding head and the welding seat adopt an air cooling system, so that the temperature of the welding head and the welding seat is reduced, and the service life of the welding head and the welding seat is prolonged.

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 cross-sectional view of a weld holder assembly of a resistance heat assisted welding apparatus according to an embodiment of the present utility model;

FIG. 3 is another cross-sectional view of a weld holder assembly of a resistance heat assisted welding apparatus according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a weld base of a resistance heat assisted welding apparatus according to an embodiment of the present utility model;

FIG. 5 is a perspective view of a fixing base of a resistance heat auxiliary welding device according to an embodiment of the present utility model;

fig. 6 is a cross-sectional view of a welding head of a resistance heat assist welding apparatus in accordance with 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 conductive rod; 113. a conductive column in the first welding seat; 114. a first electrode telescoping post; 115. a first spring; 116. a first spring air-blocking ring; 12. a second electrode; 121. a second electrode connection line; 122. a second electrode conductive rod; 123. a conductive column in the second welding seat; 124. a second electrode telescoping post; 125. a second spring; 126. a second spring air-blocking ring;

2. a welder frame; 21. a welding head connecting block; 211. a pin shaft hole; 212. a groove;

3. welding head; 31. an incoming end; 32. a first welding end; 33. a second welding end;

4. a weld holder assembly; 41. a welding seat; 411. a first column-receiving cavity; 412. a second column-holding cavity; 413. a first insulating plate; 414. an insulating fixing block; 43. a fixing seat; 431. a fixing base fixing plate; 432. a first fixing base fixing body; 433. a second fixing base fixing body; 434. a second insulating plate; 435. a fixed base plate; 436. a third column-containing cavity; 437. a fourth column-containing cavity;

5. the welding seat assembly air cooling system; 51. a first air cooling system; 511. a first air inlet interface; 512. a first cold air duct; 513. a second cold air path; 52. a second air cooling system; 521. a second air inlet port; 522. a third cold air path; 523. a fourth cold air path;

6. a piece to be welded;

71. a first insulating hose; 72. a second insulating rubber tube; 73. a first insulating spacer; 74. a second insulating spacer;

8. a welding head air cooling system; 81. a third air inlet port; 82. a fifth cold air duct; 83. a sixth cold air duct; 84. a seventh cold air duct; 85. an eighth cold air duct; 86. a ninth cold air duct; 87. a tenth cool air duct; 88. zero point hole; 89. an airway plug;

91. a horn; 92. a horn retaining ring; 93. the amplitude transformer fixes the screw.

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:

the resistance welding electrode 1 comprises a first electrode 11 and a second electrode 12, wherein the first electrode 11 comprises a first electrode connecting wire 111, a first electrode conducting rod 112, a first electrode telescopic column 114 and a first welding seat inner conducting column 113 which are connected in sequence, and the second electrode 12 comprises a second electrode connecting wire 121, a second electrode conducting rod 122, a second electrode telescopic column 124 and a second welding seat inner conducting column 123 which are connected in sequence; the welding machine frame 2 comprises a welding head driving part for providing ultrasound and driving the welding head 3 to move up and down, and a welding head connecting block 21 which is positioned at the output end of the welding head driving part and is connected with a first welding end 32, wherein a groove 212 is formed at one end of the connecting block 21 towards the first welding end 32, the first welding end 32 is placed at the groove 212, the connecting block 21 is provided with a pin shaft hole 211, the first welding end 32 is provided with a through hole, the through hole can be positioned at a zero point (vibration static position) of the first welding end 32, and the welding head 3 and the connecting block 21 are fixed through the pin shaft hole 211 and the through hole by a pin shaft (not shown in the figure); a welding head 3 for transmitting ultrasonic energy, comprising an incoming end 31, a first welding end 32 and a second welding end 33, the welding head 3 being mounted at the output end of the welding head drive and being in sliding engagement with the welding machine frame 2; the welding seat assembly 4 is used for being matched with the welding head 3, the welding seat assembly 4 is arranged on the welding machine frame 2 and comprises a welding seat 41 for bearing foil materials and a fixed seat 43, the welding seat 41 is positioned below the second welding end 33, a seam extending to be close to the top is formed in the middle of the welding seat 41 from the bottom upwards, a first insulating plate 413 or insulating glue can be filled in the middle seam of the welding seat 41, two sides of the middle bottom seam of the welding seat 41 are cut out, insulating fixed blocks 414 are used for filling, the left part and the right part of the welding seat 41 are fixed together, the first fixed seat fixed body 432 and the second fixed seat fixed body 433 are completely insulated and mutually non-conductive, a first column containing cavity 411 for containing a first welding seat inner conductive column 113 is formed on one side, a second column containing cavity 412 for containing a second welding seat inner conductive column 123 is formed on the other side, the fixed seat 43 is used for supporting the welding seat 41, a third column containing a first electrode telescopic column 114 is fixedly and in insulating connection with the welding machine frame 2 through a second insulating plate 434, a fourth column containing a second electrode telescopic column 124 is formed on the other side, a fourth column containing a second electrode telescopic column 124 is formed in one side, and a first electrode telescopic column 437 and a second electrode telescopic column 72 is arranged between the first electrode telescopic column 114 and the first electrode column and the second insulating column 437 is formed in the second insulating column and the first insulating column 71.

The bottom of the fixing seat 43 is provided with a fixing seat bottom plate 435, the first electrode 11 further comprises a first spring 115 sleeved outside the first electrode telescopic column 114, an outward protruding portion is arranged in the middle of the first electrode telescopic column 114, one end of the first spring 115 is propped against the fixing seat bottom plate 435, the other end of the first spring is propped against the lower end of the protruding portion of the first electrode telescopic column 114, the second electrode 12 further comprises a second spring 125 sleeved outside the second electrode telescopic column 124, an outward protruding portion is arranged in the middle of the second electrode telescopic column 124, one end of the second spring 125 is propped against the fixing seat bottom plate 435, the other end of the second spring is propped against the lower end of the protruding portion of the second electrode telescopic column 124, and the first spring 115 and the second spring 125 enable the telescopic column and the conductive column to be in better contact. A first spring air-isolating ring 116 is provided between the first spring 115 and the lower end of the protruding portion of the first electrode telescoping post 114, and a second spring air-isolating ring 126 is provided between the second spring 125 and the lower end of the protruding portion of the second electrode telescoping post 124, the spring air-isolating ring preventing leakage of cold air from the spring end and impairing the cooling effect. The welding device further comprises a first insulating gasket 73 sleeved outside the first electrode telescopic column 114 and positioned on the upper side of the protruding part of the first electrode telescopic column 114, and a second insulating gasket 74 sleeved outside the second electrode telescopic column 124 and positioned on the upper side of the protruding part of the second electrode telescopic column 124, wherein the insulating sheets play an insulating role, and a placing circuit does not pass through the upper end of a welding seat gap, so that the heating efficiency of the welding piece 6 is weakened.

The fixing base 43 includes a first fixing base fixing body 432, a second fixing base fixing body 433 and a fixing base fixing plate 431, the first fixing base fixing body 432 and the second fixing base fixing body 433 are separated, the first fixing base fixing body 432 and the second fixing base fixing body 433 are connected with the fixing base fixing plate 431 through a second insulating plate 434, and the fixing base fixing plate 431 is fixedly connected with the frame 2.

Wherein, the first conductive post 113 in the soldering socket 41 is pressed into the first post cavity 411 of the soldering socket 41 by overflow fit, the second conductive post 123 in the soldering socket 41 is pressed into the second post cavity 412 of the soldering socket 41 by overflow fit, and the first insulating plate 413 (or glue injection) and the pressed insulating fixing block 414 are sequentially inserted to form a brand new soldering socket integral part, so that the soldering socket can be replaced in the subsequent processing and production process.

Referring to fig. 2, the welding seat assembly air cooling system 5 further comprises a first air cooling system 51 and a second air cooling system 52, wherein the first air cooling system 51 comprises a first air inlet interface 511, a first air cooling channel 512 arranged in a first electrode telescopic column 114 and a second air cooling channel 513 arranged in a first welding seat inner conductive column 113 which are sequentially communicated, and the second air cooling system 52 comprises a second air inlet interface 521, a third air cooling channel 522 arranged in a second electrode telescopic column 124 and a fourth air cooling channel 523 arranged in a second welding seat inner conductive column 123 which are sequentially communicated. The inside of the first welding seat inner conductive column 113 and the second welding seat inner conductive column 123 is provided with a cold air cooling channel, cooling air flows from the inner holes in the first welding seat inner conductive column 113 and the second welding seat inner conductive column 123 to the working surface direction of the welding seat 41, and the ventilation grooves for guiding the top end surfaces of the first welding seat inner conductive column 113 and the second welding seat inner conductive column 123 in the welding seat 41 flow out along the outer layer surface of the welding seat inner conductive column.

Referring to fig. 6, the welding head further comprises an amplitude transformer 91 connected with the incoming end 31, an amplitude transformer fixing ring 92 arranged at the outer side of the amplitude transformer 91, an amplitude transformer fixing screw 93 for fixing the incoming end 31 and the amplitude transformer 91, a third air inlet port 81, a fifth air cooling channel 82 arranged in the amplitude transformer fixing ring 92, a sixth air cooling channel 83 arranged between the amplitude transformer fixing ring 92 and the amplitude transformer 91, a seventh air cooling channel 84 arranged in the amplitude transformer 91, an eighth air cooling channel 85 arranged in the amplitude transformer fixing screw 93, a ninth air cooling channel 86 arranged in the incoming end 31 and a tenth air cooling channel 87 arranged in the second welding end 33, wherein a zero hole 88 is arranged at the vibration static position of the second welding end 33, one end of the tenth air cooling channel 87 is communicated with the zero hole 88, and the other end of the tenth air cooling channel 87 is communicated with the outer side of the welding head 3, and an air passage plug 89 is arranged. The cold air reaches the central pore canal of the amplitude transformer 91 from the inside of the amplitude transformer fixing ring 92, then passes through the center of the amplitude transformer fixing screw 93, and reaches the front zero hole 88 through the central air passage of the welding head 3, and flows outwards to take away the residual heat of the working head.

The loop flow of the current is as follows: the positive electrode output end of the resistance welding transformer, the first electrode connecting wire 111, the first electrode conducting rod 112, the first electrode telescopic column 114, the first welding seat inner conducting column 113, the welding seat 41, the to-be-welded sheet 6, the second welding seat inner conducting column 123, the second electrode telescopic column 124, the second electrode conducting rod 122, the second electrode connecting wire 121 and the return time resistance welding transformer system negative electrode.

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 through the left electrode and the right electrode in the welding seat, and the protective insulating mechanism is added, so that the conduction of a current loop is realized. 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.

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: the welding amplitude is 0-72 um, the welding time is 0-5 s, the welding pressure is 0-0.6 MPa, the welding is allowed when the resistance and ultrasonic parameters are preset, the ultrasonic welding is triggered to carry out ultrasonic welding, and the connection of welding workpieces is realized under the ultrasonic vibration friction.

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

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:

the resistance welding electrode (1) comprises a first electrode (11) and a second electrode (12), wherein the first electrode (11) comprises a first electrode connecting wire (111), a first electrode conducting rod (112), a first electrode telescopic column (114) and a first welding seat inner conducting column (113) which are sequentially connected, and the second electrode (12) comprises a second electrode connecting wire (121), a second electrode conducting rod (122), a second electrode telescopic column (124) and a second welding seat inner conducting column (123) which are sequentially connected;

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

a welding head (3) for transmitting ultrasonic energy, comprising an incoming end (31), a first welding end (32) and a second welding end (33), said welding head (3) being mounted to the output end of said welding head drive and being in sliding engagement with said welder frame (2);

the welding seat assembly (4) is used for being matched with the welding head (3), the welding seat assembly (4) is installed in the welding machine frame (2), the welding seat assembly comprises a welding seat (41) used for bearing foil materials and a fixing seat (43), the welding seat (41) is located below the second welding end (33), a seam extending to the near top is formed in the middle of the welding seat (41) from the bottom upwards, a first column containing cavity (411) for containing a first welding seat inner conductive column (113) is formed in one side of the welding seat assembly, a second column containing cavity (412) for containing a second welding seat inner conductive column (123) is formed in the other side of the welding seat assembly, the fixing seat (43) is used for supporting the welding seat (41), the welding seat and the welding machine frame (2) are fixedly and in insulating connection through a second insulating plate (434), a third column containing cavity (436) for containing a first electrode telescopic column (114) is formed in one side of the welding seat, a fourth column containing cavity (437) for containing a second electrode telescopic column (124) is formed in the other side of the welding seat, a second insulating column containing a second insulating column (437) is formed between the first electrode telescopic column (114) and the third column containing a second insulating column (436), and the second insulating column (437) is formed between the first electrode telescopic column (71) and the second insulating column (72).

2. The resistance heat auxiliary welding device according to claim 1, wherein the connecting block (21) is provided with a groove (212) towards one end of the first welding end (32), the first welding end (32) is placed at the groove (212), the connecting block (21) is provided with a pin hole (211), the first welding end (32) is provided with a through hole, and the welding head (3) is fixed with the connecting block (21) by passing through the pin hole (211) and the through hole through the pin shaft.

3. The resistance heat auxiliary welding device according to claim 1, characterized in that a first insulating plate (413) or an insulating glue is filled in the middle slit of the weld holder (41).

4. The resistance heat auxiliary welding apparatus according to claim 1, wherein a piece is cut out on both sides of a middle bottom slit of the holder (41), and is filled with an insulating fixing block (414) to function as fixing the left and right parts of the holder (41).

5. The resistance heat auxiliary welding device according to claim 1, wherein a fixing base bottom plate (435) is arranged at the bottom of the fixing base (43), the first electrode (11) further comprises a first spring (115) sleeved outside the first electrode telescopic column (114), an outward protruding portion is arranged in the middle of the first electrode telescopic column (114), one end of the first spring (115) is propped against the fixing base bottom plate (435), the other end is propped against the protruding lower end of the first electrode telescopic column (114), the second electrode (12) further comprises a second spring (125) sleeved outside the second electrode telescopic column (124), an outward protruding portion is arranged in the middle of the second electrode telescopic column (124), one end of the second spring (125) is propped against the fixing base bottom plate (435), and the other end of the second spring is propped against the protruding lower end of the second electrode telescopic column (124).

6. The resistance heat auxiliary welding device according to claim 5, wherein a first spring air-blocking ring (116) is provided between the first spring (115) and the protruding lower end of the first electrode telescoping column (114), and a second spring air-blocking ring (126) is provided between the second spring (125) and the protruding lower end of the second electrode telescoping column (124).

7. The resistance heat auxiliary welding device according to claim 5, further comprising a first insulating spacer (73) provided on the outer side of the first electrode telescoping pole (114) and located on the upper side of the protruding portion of the first electrode telescoping pole (114), and a second insulating spacer (74) provided on the outer side of the second electrode telescoping pole (124) and located on the upper side of the protruding portion of the second electrode telescoping pole (124).

8. The resistance heat auxiliary welding device according to claim 1, wherein the fixing base (43) comprises a first fixing base fixing body (432), a second fixing base fixing body (433) and a fixing base fixing plate (431), the first fixing base fixing body (432) and the second fixing base fixing body (433) are separated, the first fixing base fixing body (432) and the second fixing base fixing body (433) are connected with the fixing base fixing plate (431) through a second insulating plate (434), and the fixing base fixing plate (431) is fixedly connected with the frame (2).

9. The resistance heat assist welding apparatus as recited in any one of claims 1-8, further comprising a holder assembly air cooling system (5) comprising a first air cooling system (51) and a second air cooling system (52), said first air cooling system (51) comprising a first air inlet interface (511), a first air cooling channel (512) disposed within a first electrode telescoping post (114) and a second air cooling channel (513) disposed within a first electrode telescoping post (113), said second air cooling system (52) comprising a second air inlet interface (521), a third air cooling channel (522) disposed within a second electrode telescoping post (124) and a fourth air cooling channel (523) disposed within a second electrode telescoping post (123) that are sequentially connected.

10. The resistance heat auxiliary welding apparatus as defined in any one of claims 1 to 8, further comprising an amplitude transformer (91) connected to the inlet end (31), an amplitude transformer fixing ring (92) provided outside the amplitude transformer (91) and an amplitude transformer fixing screw (93) for fixing the inlet end (31) and the amplitude transformer (91), and further comprising a third air inlet port (81) sequentially communicated, a fifth air cooling passage (82) provided in the amplitude transformer fixing ring (92), a sixth air cooling passage (83) provided between the amplitude transformer fixing ring (92) and the amplitude transformer (91), a seventh air cooling passage (84) provided in the amplitude transformer (91), an eighth air cooling passage (85) provided in the amplitude transformer fixing screw (93), a ninth air cooling passage (86) provided in the inlet end (31) and a tenth air cooling passage (87) provided in the second welding end (33), wherein a zero point hole (88) is provided at a vibration rest position of the second welding end (33), and the other end of the tenth air cooling passage (87) is communicated with the zero point hole (88) and is provided at the outside of the welding head (3).

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