Automatic terminal wire soldering machine

Abstract

The invention provides an automatic terminal wire soldering machine, and relates to the technical field of wire soldering, the automatic terminal wire soldering machine comprises a soldering machine whole body, a transmission mechanism is installed on the top of the soldering machine whole body close to the right side of the front face, and a clamping mechanism is installed on the back face of the transmission mechanism and also located on the top of the soldering machine whole body; a moving mechanism is fixedly connected to the position, close to the back face, of the top of the whole tin soldering machine body, a PCB is installed on the left side face of the conveying mechanism, a displacement mechanism is installed at the bottom of the PCB, and a tin soldering mechanism is installed at the position, located on the left side of the displacement mechanism, of the top of the whole tin soldering machine body. According to the automatic tin soldering machine, through the design, manual tin soldering can be effectively replaced with automatic tin soldering, the body health of workers is guaranteed, meanwhile, the training time is effectively shortened, the operation difficulty is lowered, the production efficiency is improved, and the reject ratio is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of wire soldering, in particular to an automatic soldering machine for terminal wires. Background Art

[0002] Solder is an important industrial raw material for connecting electronic components in welding circuits. It is a solder with a low melting point, mainly referring to solder made of tin-based alloys. The production method of solder is to first make ingots by melting method, and then pressure process into materials. Solder is widely used in the electronics industry, home appliance manufacturing industry, automobile manufacturing industry, maintenance industry and daily life.

[0003] In the existing technology, solder is an important industrial raw material for connecting electronic components in welding circuits, and soldering work requires the use of machines and workers to operate. However, the existing soldering industry faces the following problems: 1. The existing wire soldering industry requires a large number of skilled soldering personnel, the industry demand is greater than the supply of personnel, and personnel training has factors such as long training time and high training difficulty coefficient;

[0004] 2. Manual soldering has problems such as low efficiency, high defect rate and difficulty in rework;

[0005] 3. Soldering is slightly harmful to the human body, causing defects such as large personnel turnover and unstable work;

[0006] 4. The wire ends and pads are small, and long working hours will cause visual and physical fatigue to employees;

[0007] 5. Soldering requires heating, and the wire will conduct heat. Long-term operation by employees may cause burns to their fingers and other hazards. In order to solve these problems, we propose an automatic terminal wire soldering machine. Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings of the prior art. Solder is an important industrial raw material for connecting electronic components in welding circuits, and soldering work requires the use of machines and workers to operate. However, the existing soldering industry faces the following problems: 1. The existing wire soldering industry requires a large number of skilled soldering personnel, the industry demand is greater than the supply of personnel, and personnel training has factors such as long training time and high training difficulty coefficient;

[0009] 2. Manual soldering has problems such as low efficiency, high defect rate and difficulty in rework;

[0010] 3. Soldering is slightly harmful to the human body, causing defects such as large personnel turnover and unstable work;

[0011] 4. The wire ends and pads are small, and long working hours will cause visual and physical fatigue to employees;

[0012] 5. Soldering needs to be heated, and the wire will conduct heat. If employees operate for a long time, it may cause burns to their fingers and other hazards.

[0013] In order to achieve the above object, the present invention adopts the following technical solutions:

[0014] The terminal wire automatic soldering machine comprises a soldering machine as a whole, a transmission mechanism is installed on the top of the soldering machine as a whole near the right side of the front, a clamping mechanism is installed on the back of the transmission mechanism and also located on the top of the soldering machine as a whole, a moving mechanism is fixedly connected to the top of the soldering machine as a whole near the back, a PCB board is installed on the left side of the transmission mechanism, a displacement mechanism is installed on the bottom of the PCB board, and a soldering mechanism is installed on the top of the soldering machine as a whole and located on the left side of the displacement mechanism;

[0015] The transmission mechanism includes a mounting frame, a transmission belt is installed near the top of the mounting frame, and the transmission belt is rotatably connected to the mounting frame through a rotating shaft, a driving component is fixedly connected to the bottom of the mounting frame, and a sensor is fixedly connected to the center of the mounting frame;

[0016] The clamping mechanism comprises a base, a clamping assembly is fixedly connected to the top of the base near the front, a wire pulling assembly is installed on the top of the base and on the back of the wire clamping assembly, and a wire dividing wheel is installed on the top of the base and on the right side of the wire pulling assembly;

[0017] The moving mechanism comprises symmetrically arranged support columns, the front side of the support columns is slidably connected with a moving arm, and the bottom of the moving arm is equipped with a material picking clamp;

[0018] The displacement mechanism comprises a double Y-axis assembly, and an X-axis assembly is installed at the bottom of the double Y-axis assembly;

[0019] The soldering mechanism comprises a lifting component, a mounting plate is fixedly connected to the right side of the lifting component, telescopic components are fixedly connected to the two side surfaces of the mounting plate, a soldering iron is installed on the right side of the telescopic component, and a solder wire is installed below the soldering iron.

[0020] As a preferred solution of the present invention, a control panel is fixedly connected to the front of the soldering machine as a whole, lifting support legs are fixedly connected to the corners of the bottom of the soldering machine as a whole, and universal wheels are fixedly connected to the sides of the lifting support legs.

[0021] As a preferred solution of the present invention, the driving component includes a driving motor, the output end of the driving motor is fixedly connected to a driving wheel, the outer sleeve of the driving wheel is provided with a transmission belt, a driven wheel is installed on the inner side of the transmission belt and on a side away from the driving wheel, and the driven wheel is fixedly connected to the rotating shaft of the transmission belt.

[0022] As a preferred solution of the present invention, the wire clamping assembly includes a wire clamping platform, and a clamp cylinder is installed on the front side of the wire clamping platform and on the inner side of the mounting frame.

[0023] As a preferred solution of the present invention, the wire drawing assembly includes a material pulling clamp, and a moving cylinder is fixedly connected to the bottom of the material pulling clamp.

[0024] As a preferred solution of the present invention, the support column includes a mounting seat, a displacement component is installed inside the mounting seat, and a sliding block is fixedly connected to the front of the displacement component and located on the front of the mounting seat.

[0025] As a preferred solution of the present invention, the movable arm includes a shell, an angle adjustment component is fixedly connected to the interior of the shell, and the angle adjustment component is clamped with the material picking clamp.

[0026] The technical effect of adopting the above further scheme is: through the setting of the angle adjustment component, the angle adjustment component can effectively adjust the angle of the material picking clamp, so that the material picking clamp can be moved down to the wire end close to the designated solder point, thereby ensuring the stability of the solder.

[0027] As a preferred solution of the present invention, the lifting assembly includes a mounting block, the top of the mounting block is fixedly connected to a rotating motor, the front of the mounting block is fixedly connected to linear guide rails near both sides, the outer periphery of the linear guide rails is slidably connected to a screw slider, the inner side of the screw slider is threadedly connected to a screw, the top of the screw rod is fixedly connected to the output end of the rotating motor, the front of the screw slider is fixedly connected to a lifting plate, and the lifting plate is fixedly connected to the mounting plate.

[0028] The technical effect of adopting the above further solution is: through the setting of the lifting component, the lifting component can effectively drive the electric soldering iron to move up and down through lifting, and the soldering work can be stably performed through the up and down movement.

[0029] As a preferred solution of the present invention, the telescopic assembly includes a telescopic cylinder fixedly connected to the left side of the mounting plate, the output end of the telescopic cylinder is fixedly connected to a telescopic arm, the left side of the telescopic arm is fixedly connected to a guide block, the left side of the guide block is slidably connected to a guide rail, and the guide rail is fixedly connected to the mounting plate.

[0030] As a preferred solution of the present invention, the material picking clamp adopts a contoured structure, and the material picking clamp is customized according to the material and the distance between the welding points.

[0031] The technical effect of adopting the above further solution is: by adopting a contoured structure for the material picking clamp and customizing the material picking clamp according to the distance between the material and the welding point, the accuracy of welding between the material and the welding point can be effectively guaranteed.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. In the present invention, through the setting of the transmission mechanism, the clamping mechanism and the moving mechanism, the transmission mechanism can effectively transport the material to the specified position accurately after manual loading, so as to facilitate the subsequent clamping mechanism to organize the material, and the clamping mechanism can effectively stretch and divide the material through the wire clamping assembly, the wire pulling assembly and the wire dividing wheel, and facilitate the subsequent welding work through the wire dividing, and the mobile mechanism can effectively transport the organized material, so as to facilitate the welding work.

[0034] 2. In the present invention, through the setting of the displacement mechanism and the soldering mechanism, the displacement mechanism can effectively and accurately transport the PCB board to the bottom of the soldering mechanism. In this way, there is no need to manually place the PCB board, thereby effectively avoiding the harm of solder to the staff and effectively avoiding the staff from being burned. The telescopic component can effectively control the lifting and lowering of the soldering iron, and the lifting and lowering of the soldering iron can facilitate the welding work. The angle adjustment component can effectively adjust the angle of the material clamp, and the angle of the material and the soldering point can be adjusted by adjusting the angle of the material clamp, so as to facilitate the welding work.

[0035] 3. In the present invention, manual soldering operations are replaced by manual material discharge, mechanical arrangement, material conveying, and automatic soldering, thereby effectively avoiding various injuries to the human body. In addition, by changing professional technical jobs into ordinary workstations, the training time can be shortened, the efficiency can be greatly improved, and the defective rate can be greatly reduced. At the same time, it brings about personnel stability, production capacity stability, and thus stable and guaranteed production progress. It can also reduce employee fatigue and physical harm, and promote safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the top plan structure of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of the control panel of the present invention;

[0039] Figure 4 It is a schematic diagram of the transmission mechanism structure of the present invention;

[0040] Figure 5 This is a schematic diagram of the disassembly structure of the clamping mechanism of the present invention;

[0041] Figure 6 It is a schematic diagram of the disassembled structure of the soldering mechanism of the present invention.

[0042] Legend: 1. Soldering machine as a whole; 11. Control panel; 12. Lifting support legs; 13. Universal wheels;

[0043] 2. Transmission mechanism; 21. Mounting frame; 22. Transmission belt; 23. Driving assembly; 231. Driving motor; 232. Driving wheel; 233. Transmission belt; 234. Driven wheel; 24. Sensor;

[0044] 3. Clamping mechanism; 31. Base; 32. Wire clamping assembly; 321. Wire clamping platform; 322. Clamp cylinder; 33. Wire pulling assembly; 331. Material taking clamp; 332. Moving cylinder; 34. Wire dividing wheel;

[0045] 4. Moving mechanism; 41. Support column; 411. Mounting seat; 412. Displacement assembly; 413. Sliding block; 42. Moving arm; 421. Housing; 422. Angle adjustment assembly; 43. Material picking clamp;

[0046] 5. PCB board;

[0047] 6. Displacement mechanism; 61. Double Y-axis assembly; 62. X-axis assembly;

[0048] 7. Soldering mechanism; 71. Lifting assembly; 711. Mounting block; 712. Rotating motor; 713. Linear guide rail; 714. Screw slider; 715. Screw; 716. Lifting plate; 72. Mounting plate; 73. Telescopic assembly; 731. Telescopic cylinder; 732. Telescopic arm; 733. Guide block; 734. Guide rail; 74. Electric soldering iron; 75. Solder wire. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to related references, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0051] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0053] Example 1

[0054] like Figure 1-6 As shown, the present invention provides a technical solution: an automatic terminal wire soldering machine, comprising a soldering machine as a whole 1, a transmission mechanism 2 is installed on the top of the soldering machine as a whole 1 near the right side of the front, a clamping mechanism 3 is installed on the back of the transmission mechanism 2 and also located on the top of the soldering machine as a whole 1, a moving mechanism 4 is fixedly connected to the top of the soldering machine as a whole 1 near the back, a PCB board 5 is installed on the left side of the transmission mechanism 2, a displacement mechanism 6 is installed on the bottom of the PCB board 5, a soldering mechanism 7 is installed on the top of the soldering machine as a whole 1 and on the left side of the displacement mechanism 6, the transmission mechanism 2 comprises a mounting frame 21, a transmission belt 22 is installed near the top of the mounting frame 21, and the transmission belt 22 is rotatably connected to the mounting frame 21 through a rotating shaft, a driving assembly 23 is fixedly connected to the bottom of the mounting frame 21, and a sensor 24 is fixedly connected to the center of the mounting frame 21, through the sensor 24 The precision of the conveyor belt 22 can be effectively controlled. The clamping mechanism 3 includes a base 31. A wire clamping assembly 32 is fixedly connected to the top of the base 31 near the front. A wire pulling assembly 33 is installed on the top of the base 31 and on the back of the wire clamping assembly 32. A wire dividing wheel 34 is installed on the top of the base 31 and on the right side of the wire pulling assembly 33. The moving mechanism 4 includes symmetrically arranged support columns 41. A moving arm 42 is slidably connected to the front of the support column 41. A material picking clamp 43 is installed at the bottom of the moving arm 42. The displacement mechanism 6 includes a double Y-axis assembly 61. An X-axis assembly 62 is installed at the bottom of the double Y-axis assembly 61. The soldering mechanism 7 includes a lifting assembly 71. A mounting plate 72 is fixedly connected to the right side of the lifting assembly 71. Telescopic assemblies 73 are fixedly connected to the two side surfaces of the mounting plate 72. An electric soldering iron 74 is installed on the right side of the telescopic assembly 73. A solder wire 75 is installed below the electric soldering iron 74.

[0055] Example 2

[0056] like Figure 1-6 As shown, a control panel 11 is fixedly connected to the front of the soldering machine 1, lifting support legs 12 are fixedly connected to the corners around the bottom of the soldering machine 1, and universal wheels 13 are fixedly connected to the sides of the lifting support legs 12. The automatic soldering function can be effectively realized through the control panel 11.

[0057] The driving assembly 23 includes a driving motor 231, the output end of the driving motor 231 is fixedly connected to a driving wheel 232, the outer sleeve of the driving wheel 232 is provided with a transmission belt 233, and a driven wheel 234 is installed on the inner side of the transmission belt 233 and on a side away from the driving wheel 232, and the driven wheel 234 is fixedly connected to the rotating shaft of the transmission belt 22. The driving assembly 23 can effectively drive the transmission belt 22 to perform transmission work.

[0058] The wire clamping assembly 32 includes a wire clamping platform 321 , and a clamp cylinder 322 is installed on the front of the wire clamping platform 321 and located on the inner side of the mounting frame 21 . The clamp cylinder 322 can effectively control the wire clamping platform 321 to clamp the material.

[0059] The wire pulling assembly 33 includes a material pulling clamp 331 , and a moving cylinder 332 is fixedly connected to the bottom of the material pulling clamp 331 . The moving cylinder 332 can drive the material pulling clamp 331 to pull the material for sorting.

[0060] The support column 41 includes a mounting seat 411, a displacement assembly 412 is installed inside the mounting seat 411, and a sliding block 413 is fixedly connected to the front of the displacement assembly 412 and located on the front of the mounting seat 411. The displacement assembly 412 can effectively drive the sliding block 413 to move, thereby driving the moving arm 42 to move.

[0061] The movable arm 42 includes a shell 421 , and an angle adjustment component 422 is fixedly connected to the interior of the shell 421 . The angle adjustment component 422 is engaged with the material picking clamp 43 , and the angle of the movable arm 42 can be effectively adjusted through the angle adjustment component 422 .

[0062] The lifting assembly 71 includes a mounting block 711, a rotating motor 712 is fixedly connected to the top of the mounting block 711, a linear guide rail 713 is fixedly connected to the front side of the mounting block 711 near both sides, a screw slider 714 is slidably connected to the periphery of the linear guide rail 713, a screw slider 714 is threadedly connected to the inner side of the screw slider 714, the top of the screw slider 715 is fixedly connected to the output end of the rotating motor 712, a lifting plate 716 is fixedly connected to the front side of the screw slider 714, and the lifting plate 716 is fixedly connected to the mounting plate 72. The lifting assembly 71 can effectively control the lifting and lowering of the soldering mechanism 7.

[0063] The telescopic assembly 73 includes a telescopic cylinder 731 fixedly connected to the left side of the mounting plate 72, the output end of the telescopic cylinder 731 is fixedly connected to a telescopic arm 732, the left side of the telescopic arm 732 is fixedly connected to a guide block 733, the left side of the guide block 733 is slidably connected to a guide rail 734, the guide rail 734 is fixedly connected to the mounting plate 72, and the telescopic assembly 73 can control the lifting and lowering of the electric soldering iron 74.

[0064] The material taking clamp 43 adopts a contour structure, and the material taking clamp is customized according to the material and the distance between the welding points.

[0065] The working process of the present invention is as follows: when using the terminal wire automatic soldering machine for soldering, first, the staff manually puts the wire into the wire slot and places it on the conveyor belt 22, then the driving component 23 drives the conveyor belt 22 for transportation, and the sensor 24 accurately controls the wire to reach the specified position, after reaching the specified position, the wire clamping component 32 clamps the wire, and pulls the wire through the wire pulling component 33, and at the same time the wire dividing wheel 34 separates the wire according to the set spacing, and after separation, the material taking clamp 43 clamps the separated wires, and at the same time the clamping mechanism 3 releases the wire, then the staff fixes the PCB board 5 on the top of the displacement mechanism 6, and the displacement mechanism 6 moves the PCB board 5 to the specified position, and at the same time the displacement mechanism 6 releases the wire. Component 412 drives the sliding block 413 to move, and the movement of the sliding block 413 drives the moving arm 42 to move to the specified position. After moving to the specified position, the angle adjustment component 422 drives the material picking clamp 43 to rotate the angle to place the wire on the PCB board 5. Then the lifting component 71 drives the mounting plate 72 to descend to the specified position. After completion, the telescopic component 73 drives the electric soldering iron 74 and the solder wire 75 to solder the solder joints. After soldering is completed, continue to repeat the above work. The present invention can effectively replace manual soldering with automatic soldering through design, ensure the health of the staff, and at the same time effectively reduce the training time, reduce the difficulty of operation, improve production efficiency, and reduce the defective rate.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic terminal wire soldering machine, comprising a soldering machine as a whole (1), characterized in that: A transmission mechanism (2) is installed on the top of the soldering machine (1) near the right side of the front, a clamping mechanism (3) is installed on the back of the transmission mechanism (2) and also located on the top of the soldering machine (1), a moving mechanism (4) is fixedly connected to the top of the soldering machine (1) near the back, a PCB board (5) is installed on the left side of the transmission mechanism (2), a displacement mechanism (6) is installed on the bottom of the PCB board (5), and a soldering mechanism (7) is installed on the top of the soldering machine (1) and located on the left side of the displacement mechanism (6); The transmission mechanism (2) comprises a mounting frame (21), a transmission belt (22) is installed near the top of the mounting frame (21), and the transmission belt (22) is rotatably connected to the mounting frame (21) via a rotating shaft, a driving assembly (23) is fixedly connected to the bottom of the mounting frame (21), and a sensor (24) is fixedly connected to the center of the mounting frame (21); The clamping mechanism (3) comprises a base (31), a clamping assembly (32) is fixedly connected to the top of the base (31) near the front, a wire pulling assembly (33) is installed at the top of the base (31) and on the back of the wire clamping assembly (32), and a wire dividing wheel (34) is installed at the top of the base (31) and on the right side of the wire pulling assembly (33); The moving mechanism (4) comprises symmetrically arranged support columns (41), the front side of the support columns (41) is slidably connected to a moving arm (42), and the bottom of the moving arm (42) is provided with a material taking clamp (43); The displacement mechanism (6) comprises a double Y-axis assembly (61), and an X-axis assembly (62) is installed at the bottom of the double Y-axis assembly (61); The soldering mechanism (7) comprises a lifting component (71), the right side of the lifting component (71) is fixedly connected to a mounting plate (72), the two side surfaces of the mounting plate (72) are fixedly connected to telescopic components (73), the right side of the telescopic component (73) is installed with an electric soldering iron (74), and a solder wire (75) is installed below the electric soldering iron (74).

2. The terminal wire automatic soldering machine according to claim 1, characterized in that: A control panel (11) is fixedly connected to the front of the soldering machine as a whole (1), lifting support legs (12) are fixedly connected to the corners of the bottom of the soldering machine as a whole (1), and universal wheels (13) are fixedly connected to the sides of the lifting support legs (12).

3. The terminal wire automatic soldering machine according to claim 1, characterized in that: The driving assembly (23) comprises a driving motor (231), the output end of the driving motor (231) is fixedly connected to a driving wheel (232), a transmission belt (233) is sleeved on the outer periphery of the driving wheel (232), a driven wheel (234) is installed on the inner side of the transmission belt (233) and on a side away from the driving wheel (232), and the driven wheel (234) is fixedly connected to the rotating shaft of the transmission belt (22).

4. The terminal wire automatic soldering machine according to claim 1, characterized in that: The wire clamping assembly (32) comprises a wire clamping platform (321), and a clamping cylinder (322) is installed on the front side of the wire clamping platform (321) and located on the inner side of the mounting frame (21).

5. The terminal wire automatic soldering machine according to claim 1, characterized in that: The wire drawing assembly (33) comprises a material drawing clamp (331), and a movable cylinder (332) is fixedly connected to the bottom of the material drawing clamp (331).

6. The terminal wire automatic soldering machine according to claim 1, characterized in that: The support column (41) comprises a mounting seat (411), a displacement assembly (412) is installed inside the mounting seat (411), and a sliding block (413) is fixedly connected to the front of the displacement assembly (412) and located on the front of the mounting seat (411).

7. The terminal wire automatic soldering machine according to claim 1, characterized in that: The movable arm (42) comprises a shell (421), an angle adjustment component (422) is fixedly connected to the interior of the shell (421), and the angle adjustment component (422) is clamped with the material taking clamp (43).

8. The terminal wire automatic soldering machine according to claim 1, characterized in that: The lifting assembly (71) comprises a mounting block (711), the top of the mounting block (711) is fixedly connected to a rotating motor (712), the front of the mounting block (711) is fixedly connected to linear guide rails (713) near both sides, the periphery of the linear guide rails (713) is slidably connected to a screw slider (714), the inner side of the screw slider (714) is threadedly connected to a screw rod (715), the top of the screw rod (715) is fixedly connected to the output end of the rotating motor (712), the front of the screw slider (714) is fixedly connected to a lifting plate (716), and the lifting plate (716) is fixedly connected to the mounting plate (72).

9. The terminal wire automatic soldering machine according to claim 1, characterized in that: The telescopic assembly (73) comprises a telescopic cylinder (731) fixedly connected to the left side of the mounting plate (72); the output end of the telescopic cylinder (731) is fixedly connected to a telescopic arm (732); the left side of the telescopic arm (732) is fixedly connected to a guide block (733); the left side of the guide block (733) is slidably connected to a guide rail (734); and the guide rail (734) is fixedly connected to the mounting plate (72).

10. The terminal wire automatic soldering machine according to claim 1, characterized in that: The material taking clamp (43) adopts a contoured structure and is customized according to the material and the distance between the welding points.

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