Welding device

Abstract

The present application relates to a welding device comprising: an electromagnetic induction heating device comprising a coil; two clamp assemblies; the supporting piece is clamped by the two clamp assemblies, the free ends of the two cable conductors to be welded penetrate through the corresponding clamp assemblies respectively and then stretch into the supporting piece, and the coil is wound on the peripheral face of the supporting piece; wherein the coil generates an alternating magnetic field under the control of high-frequency current, and the cable conductor to be welded can generate induced current in the alternating magnetic field and generate a large amount of Joule heat, so that the cable conductor to be welded is fused and welded in the supporting piece. The construction method is beneficial to protecting the ecological environment and the health of constructors. In addition, the working efficiency of cable connection can be greatly improved, and the construction time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a welding device. BACKGROUND

[0002] With the acceleration of global urbanization, urban space is precious, and power cables play an increasingly important role in urban power transmission. The laying range of medium-voltage cables is expanding, and they have largely replaced urban overhead lines. Due to the complex and diverse needs of the construction site, the length limitation of the cable itself, and cable operation failures and other factors, cable breakpoint connection has become a key problem that cannot be avoided. Among them, conductor welding is an important link in the breakpoint connection of medium-voltage cables, and the quality of the welding point directly affects the reliability and safety of power transmission. If the quality of the welding point is poor, it may cause power transmission interruption, short circuit, overheating and other faults. The occurrence of faults not only affects the normal life of residents, increases maintenance costs and power outage time, but also may cause serious economic losses to industrial production, commercial operation, etc., and even endanger public safety. Therefore, solving the problem of cable breakpoint connection is crucial for the stable operation of urban power transmission and distribution networks.

[0003] Currently, mechanical pressure connection or aluminum exothermic welding technology is commonly used to realize the construction of the conductive path. Among them, mechanical pressure connection is convenient to construct, but the stability of the joint quality is insufficient, and it is affected by the precision of the pressure connector, the wear of the mold, and the technical level of the operator, which may cause burnout failure due to excessive connection point resistance. The aluminum exothermic welding can avoid the problem of excessive contact resistance, but there are safety hazards of open fire operation, and a large amount of toxic smoke is generated during the reaction, which endangers the environment and the health of construction personnel. SUMMARY

[0004] Therefore, it is necessary to provide a welding device in view of the problems of fire risk and aluminum exothermic welding smoke pollution.

[0005] The present application provides a welding device, which comprises:

[0006] An electromagnetic induction heating device comprising a coil;

[0007] Two clamp assemblies;

[0008] A support member clamped by the two clamp assemblies, the free ends of the two cable conductors to be welded respectively pass through a corresponding clamp assembly and extend into the support member, and the coil is wound around the outer peripheral surface of the support member;

[0009] Wherein, the coil generates an alternating magnetic field under the control of high-frequency current, the cable conductors to be welded generate induced current in the alternating magnetic field, and a large amount of Joule heat is generated, so that the cable conductors to be welded are fused and welded in the support member.

[0010] In one of the embodiments, an outer side of the coil is sleeved with a first cooling jacket, and the first cooling jacket is configured to circumscribe a water circulation pipeline.

[0011] In one of the embodiments, the welding device further comprises:

[0012] A nozzle is arranged on an outer circumferential surface of the support member, and comprises a nozzle first part and a nozzle second part which are perpendicular to each other, the nozzle first part extends along a radial direction of the support member, a first end of the nozzle first part is communicated to an inside of the support member, a second end of the nozzle first part is communicated to a first end of the nozzle second part, and a second end of the nozzle second part is configured to face away from an operator.

[0013] In one of the embodiments, the welding device further comprises:

[0014] An ejector pipe is sleeved on an outer circumferential surface of the nozzle second part, a first end of the ejector pipe is located on a side of the second end of the nozzle second part which is away from the nozzle first part, and a second end of the ejector pipe is provided with an air inlet hole.

[0015] In one of the embodiments, an outer side of the first cooling jacket is sleeved with a second cooling jacket, the second cooling jacket and the first cooling jacket constitute an air cooling pipeline, and the air cooling pipeline is communicated to the air inlet hole.

[0016] In one of the embodiments, the welding device further comprises:

[0017] A cylinder is mounted on one of the two clamp assemblies;

[0018] A heat-resistant pressure pipe is arranged inside the nozzle second part, a first end of the heat-resistant pressure pipe extends from the first end of the nozzle second part and is communicated to an outlet end of the cylinder through a connecting hose, and a second end of the heat-resistant pressure pipe is provided with an air injection one-way valve.

[0019] A piston rod is mounted on the other of the two clamp assemblies, and a piston of the piston rod can be inserted into the cylinder and continuously compress the gas in the cylinder in a process in which the two clamp assemblies approach each other.

[0020] In one of the embodiments, the clamp assembly comprises:

[0021] A clamp is in a cylindrical shape and is spliced by two symmetrical clamp bodies, the clamp has a through slot which penetrates in an axial direction, an end surface of the clamp is used to clamp the support member and is provided with a first sealing member, a free end of a cable conductor to be welded passes through the through slot, an inner circumferential surface of the through slot is provided with a second sealing member, and both sides of each of the clamp bodies are provided with an ear plate.

[0022] Two connecting brackets, each of which is used to connect corresponding ear plates of two symmetrical clamp bodies.

[0023] In one embodiment, the corresponding connecting brackets of the two clamping assemblies are connected by screws.

[0024] In one embodiment, the connecting bracket is provided with a groove to engage the corresponding ear plates of the two symmetrical clamp bodies.

[0025] In one embodiment, the sidewall of the groove is provided with a first mounting hole, the ear plate is provided with a second mounting hole corresponding to the first mounting hole, and the clamp assembly further includes a bolt and a nut, the bolt passing through the first mounting hole and the second mounting hole and then being locked by the nut.

[0026] The aforementioned welding device achieves the fusion welding of the cable conductors through electromagnetic induction heating, avoiding the use of open flames and thus eliminating fire risks and aluminothermic welding fume pollution. It is better suited to complex on-site construction environments, contributing to the protection of the ecological environment and the health of construction workers. Furthermore, it significantly improves the efficiency of cable splicing, reduces construction time, and provides a more efficient, reliable, and environmentally friendly conductor splicing solution for the construction and maintenance of urban power transmission and distribution networks. Attached Figure Description

[0027] Figure 1 A schematic diagram of the structure of a welding apparatus according to an embodiment of this application.

[0028] Figure 2 This is a schematic diagram showing the positions of the coil and the first cooling jacket.

[0029] Figure 3 This is a structural schematic diagram of the support component.

[0030] Figure 4 A schematic diagram of the welding apparatus provided in another embodiment of this application.

[0031] Figure 5 for Figure 4 Top view.

[0032] Figure 6A for Figure 5 Cross-sectional view at point AA.

[0033] Figure 6B for Figure 6A A magnified view of a section at point C.

[0034] Figure 7 for Figure 5 Cross-sectional view at point BB.

[0035] Figure 8 is an assembly view of two clamp assemblies.

[0036] Figure 9 is a structural view of a clamp assembly.

[0037] Figure 10 is an exploded view of Figure 9

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 110, coil; 120, first cooling jacket;

[0040] 200, clamp assembly; 210, clamp; 211, clamp body; 212, through slot; 213, lug; 214, second mounting hole; 215, butt joint hole; 220, connecting bracket; 221, recess; 222, first mounting hole; 223, mounting slot; 230, screw rod;

[0041] 300, support; 310, melting cavity; 301, exhaust hole;

[0042] 400, cable conductor to be welded;

[0043] 500, nozzle; 510, first part of nozzle; 511, first end; 512, second end; 520, second part of nozzle; 521, first end; 522, second end;

[0044] 600, ejector pipe; 601, first end; 602, second end; 603, air inlet hole;

[0045] 710, air cylinder;

[0046] 720, heat-resistant pressure pipe; 721, first end; 722, second end; 723, air injection one-way valve; 724, connecting hose;

[0047] 730, piston rod. DETAILED DESCRIPTION

[0048] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details. In other instances, well-known process steps have not been described in detail in order to avoid obscuring the present application.

[0049] ​Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] The following is combined Figures 1 to 10 The welding apparatus according to the embodiment of this application will be described.

[0051] like Figure 1 As shown, the welding apparatus of this application includes: an electromagnetic induction heating device, two clamp assemblies 200 and a support member 300.

[0052] The electromagnetic induction heating device includes a coil 110.

[0053] The support 300 is held by two clamping assemblies 200. The free ends of the two cable conductors 400 to be welded pass through a corresponding clamping assembly and extend into the support 300. The coil 110 is wound around the outer circumference of the support 300.

[0054] The coil 110 generates an alternating magnetic field under the control of a high-frequency current. The cable conductors 400 to be welded will generate an induced current in the alternating magnetic field and generate a large amount of Joule heat, which will cause the two cable conductors 400 to be welded to heat up rapidly until they reach the melting temperature of the two cable conductors 400 to be welded, so that the two cable conductors 400 to be welded will be melted and welded in the support 300.

[0055] This application utilizes electromagnetic induction heating to achieve fusion welding of the cable conductor 400, avoiding the use of open flames and thus eliminating fire risks and aluminothermic welding fume pollution. It is better suited to complex on-site construction environments, contributing to the protection of the ecological environment and the health of construction workers. Furthermore, it significantly improves the efficiency of cable splicing, reduces construction time, and provides a more efficient, reliable, and environmentally friendly conductor splicing solution for the construction and maintenance of urban power transmission and distribution networks.

[0056] This application, through the cooperation of the clamp assembly 200 and the support 300, can form a welding zone, prevent the melting process from flowing, thereby ensuring the stability and uniformity of the quality of the welding part, while ensuring the concentration of internal heat, which is conducive to the rapid increase of welding temperature, and at the same time providing a certain pressure to the welding zone, ensuring the uniform shape and stable quality of the welding part.

[0057] Furthermore, the welding apparatus of the present application embodiment can be applied to medium-voltage cable conductors.

[0058] Further, the coil 110 is spirally wound by copper wire. The spiral structure of the coil 110 helps to concentrate the magnetic field on the heating part of the cable conductor 400 to be welded, enhances the magnetic field strength, makes the eddy current effect more significant, and further improves the heating speed. In addition, the spiral structure of the coil 110 can avoid local overheating by 360° three-dimensional heating, ensure the uniformity of heating, reduce the thermal stress of the heated object, and prolong the service life and operation stability of the equipment.

[0059] Further, the coil 110 has 4 turns, a turn spacing of 2 mm, and a wire diameter of 2 mm. The specific size of the coil 110 can be determined according to the actual application of the cable conductor specification.

[0060] When winding, starting from one end of the support 300, the coil 110 is tightly and uniformly wound on the support 300 according to a predetermined appropriate turn spacing. After each turn, the coil quality is checked to ensure the quality of the coil.

[0061] Further, as shown in Figure 2 , the outer side of the coil 110 is sleeved with a first cooling jacket 120, which is configured to be connected to a water circulation pipeline, and can carry away the heat generated by the coil 110 during induction, ensuring the reliability of the welding device during use. The cooling water temperature needs to ensure that the temperature of the first cooling jacket 120 is kept below 65°C. In this application, the temperature of the cooling water is set to 25°C, which can ensure good temperature control effect.

[0062] Further, the electromagnetic induction heating device further comprises a power supply (not shown in the figure), which is electrically connected to the coil 110 to provide high-frequency current to the coil 110.

[0063] Further, as shown in Figure 3 , the support 300 is cylindrical and has a melting cavity 310 extending through its axial direction, and the free end of the cable conductor 400 to be welded extends into the melting cavity 310 after passing through the clamp assembly 200.

[0064] Further, as shown in Figure 3 , the outer peripheral surface of the support 300 is provided with an exhaust hole 301, which is communicated to the melting cavity 310. The volatile gas generated during the heating and melting process of the cable conductor 400 to be welded is discharged in time through the exhaust hole 301, avoiding the formation of pores in the welded joint, which seriously affects the joint quality.

[0065] Further, a filtering device can be provided at the exhaust hole 301 to prevent impurities from entering the exhaust hole 301 and causing blockage, ensuring the smoothness of the exhaust hole 301.

[0066] Further, the length of the support 300 is 160 mm, and the thickness of the support 300 is 20 mm, so as to ensure that the coil 110 and the cable conductor 400 to be welded are isolated.

[0067] Further, the support 300 is made of a material with low magnetic permeability, so as to ensure that the support 300 does not affect the induction magnetic field acting on the melting cavity 310, and the effective isolation of the electromagnetic field and the metal part (i.e., the free end of the cable conductor 400 to be welded) can be achieved. In addition, the support 300 has high compressive strength, so as to ensure that the conductor has a certain circumferential pressure during the butt joint, and the generation of pores is reduced.

[0068] Further, the support 300 is made of ceramic, which is used to fix the cable conductor 400 to be welded. The ceramic has low magnetic permeability and high compressive strength, so as to improve the reliability of the preparation process of the support 300.

[0069] Further, as shown in Figures 4 to 6B , the welding device further comprises a nozzle 500, the nozzle 500 is arranged on the outer circumferential surface of the support 300, and the nozzle 500 comprises a nozzle first part 510 and a nozzle second part 520 which are perpendicular to each other. The nozzle first part 510 extends along the radial direction of the support 300, a first end 511 of the nozzle first part 510 is communicated to the inside of the support 300, and a second end 512 of the nozzle first part 510 is communicated to a first end 521 of the nozzle second part 520. A second end 522 of the nozzle second part 520 is configured to face away from the operator. During the fusion process, the operator is located on the side close to the nozzle first part 510 (i.e., the left side in Figure 6A , the nozzle 500 can guide the gas generated during the fusion process away from the side of the operator, so as to ensure that the operator is not affected by the harmful gas and heat during the fusion. Specifically, the first end 511 of the nozzle first part 510 is communicated to the exhaust hole 301, so as to be communicated to the inside of the support 300.

[0070] The arrangement of the exhaust hole 301 and the nozzle 500 can export the heat inside the support 300 to a certain extent, and can timely discharge the volatile gas generated during the heating process, so as to avoid the formation of pores in the fusion joint and seriously affect the quality of the joint.

[0071] Further, as shown in Figures 4 to 6B , the welding device further comprises an ejector pipe 600, the ejector pipe 600 is sleeved on the outer circumferential surface of the nozzle second part 520, and a first end 601 of the ejector pipe 600 is located on the side of the second end 522 of the nozzle second part 520 which is away from the nozzle first part 510. A second end 602 of the ejector pipe 600 is provided with an air inlet hole 603 (see Figure 4). The second end 602 of the ejector pipe 600 corresponds to a position between the first end 521 and the second end 522 of the second part 520 of the nozzle.

[0072] Due to the high gas pressure at the welding position of the melting cavity 310 and the temperature rise, a certain sustained jet effect can be formed. When the gas is sprayed out of the exhaust hole 301, the jet from the nozzle 500 can form a back pressure zone in the ejector pipe 600. The intake hole 603 can introduce external air into the ejector pipe 600 and mix with the high-temperature gas discharged from the exhaust hole 301, so that the temperature of the finally sprayed gas is reduced, preventing burns when facing people.

[0073] Further, the intake hole 603 is provided with multiple intake holes, which can increase the intake amount.

[0074] Further, the outside of the first cooling jacket 120 is provided with a second cooling jacket (not shown in the figure), and the second cooling jacket and the first cooling jacket 120 form an air cooling pipeline, which is connected to any one of the intake holes 603. The jet from the nozzle 500 can help the air in the air cooling pipeline to flow faster, thereby accelerating the heat dissipation of the first cooling jacket 120, i.e., cooling the first cooling jacket 120 and the cooling water in the first cooling jacket 120. In this way, the auxiliary effect on the first cooling jacket 120 can be enhanced, thereby reducing the water cooling power consumption.

[0075] Further, as shown in Figures 4 to 7 , the welding device of the present application further comprises: a gas cylinder 710, a heat-resistant pressure pipe 720 and a piston rod 730.

[0076] As shown in Figure 4 , the gas cylinder 710 is installed on one of the two clamp assemblies 200.

[0077] As shown in Figure 6A and Figure 6B , the heat-resistant pressure pipe 720 is arranged inside the second part 520 of the nozzle, the first end 721 of the heat-resistant pressure pipe 720 extends from the first end 521 of the second part 520 of the nozzle and is connected to the outlet end of the gas cylinder 710 through a connecting hose 724, and the second end 722 of the heat-resistant pressure pipe 720 is provided with a gas one-way valve 723.

[0078] As shown in Figure 4 , the piston rod 730 is installed on the other clamp assembly 200. During the process of approaching each other of the two clamp assemblies 200, the piston of the piston rod 730 can be inserted into the gas cylinder and continuously compress the gas in the gas cylinder 710.

[0079] In the process of approaching and locking of the two clamp assemblies 200, the piston rod 730 is inserted into the cylinder 710, and the gas in the cylinder 710 is continuously compressed to form high-pressure gas in the cylinder 710, which is transmitted to the heat-resistant pressure pipe 720 through the connecting hose 724. At this time, the gas in the heat-resistant pressure pipe 720 is under high pressure (i.e., a pre-gas pressure is formed inside the heat-resistant pressure pipe 720), but has not reached the threshold value, and is not sufficient to open the jet one-way valve 723, which remains closed and maintains the high pressure inside. When the welding process starts, the hot gas flow starts to be injected in the lance 500, so that the temperature in the lance 500 gradually rises, and the gas in the heat-resistant pressure pipe 720 expands and the pressure continues to rise. When the gas pressure in the heat-resistant pressure pipe 720 reaches the opening pressure of the jet one-way valve 723, the jet one-way valve 723 opens, so that the high-pressure gas is ejected from the jet one-way valve 723 and forms a back pressure area in the second part 520 of the lance 500, thereby rapidly taking out the gas in the welding area, further reducing the defects of pores in the welding area, and improving the quality of the finished welding area. In addition, due to the superposition effect of the expanded gas in the heat-resistant pressure pipe 720 and the gas ejected from the lance 500, the entraining effect (jet velocity and pressure) in the injector 600 is further enhanced, the flow effect of the air cooling pipeline is further enhanced, and the water cooling power consumption is further reduced.

[0080] The clamp assembly 200 is provided with two and symmetrically distributed on both sides of the axial direction of the support 300, which facilitates the assembly of the cable conductor 400 to be welded into the support 300 and improves the convenience of operation and disassembly. Such a mode can adapt to the split and distributed operation in the high-altitude operation environment, and the operation is flexible and can be well completed by one person, so that the operation can be well performed in any operation environment.

[0081] Further, as shown in Figures 8 to 10 The clamp assembly 200 includes a clamp 210 and two connecting brackets 220.

[0082] The clamp 210 is cylindrical and is spliced by two symmetrical clamp bodies 211, and has a through slot 212 penetrating in the axial direction. The end face of the clamp 210 is used for clamping the support 300 and is provided with a first sealing member (not shown in the figure). The free end of the cable conductor 400 to be welded passes through the through slot 212, and the inner circumferential surface of the through slot 212 is provided with a second sealing member (not shown in the figure). Each clamp body 211 has an ear plate 213 on both sides.

[0083] Each connecting bracket 220 is used for connecting the corresponding ear plates 213 of the two symmetrical clamp bodies 211.

[0084] The lug 213 is provided with a butt joint hole 215, and the butt joint hole 215 of the lug 213 of the symmetrical clamp body 211 is fixed by a bolt and a nut.

[0085] In use, first, the two clamp bodies 211 are clamped at the free end of the cable conductor 400 to be welded, and the butt joint holes 215 of the lugs 213 are aligned, and then fixed by a bolt and a nut to clamp the free end of the cable conductor 400 to be welded.

[0086] Further, as shown in the drawings, Figure 10 The connecting bracket 220 is provided with a groove 221 to clamp the corresponding lugs 213 of the two symmetrical clamp bodies 211.

[0087] Further, as shown in the drawings, Figure 10 The side wall of the groove 221 is provided with a first mounting hole 222, and the lug 213 is provided with a second mounting hole 214 corresponding to the first mounting hole 222, and the clamp assembly 200 further comprises a bolt and a nut, and the bolt passes through the first mounting hole 222 and the second mounting hole 214 and is locked by the nut.

[0088] Further, as shown in the drawings, Figure 8 The corresponding connecting brackets 220 of the two clamp assemblies 200 are connected by a screw rod 230.

[0089] Specifically, the connecting bracket 220 has a through mounting slot 223, and the screw rod 230 passes through the mounting slot 223 and is fixed with a nut.

[0090] The clamp 210, the connecting bracket 220, the screw rod 230, the bolt and the nut jointly act on the support 300 and the coil 110 to perform secondary fixation, exert a certain pressure after the conductor of the cable conductor 400 to be welded is melted and recast, ensure the heating effect and the density of the conductor recast, and prevent the performance of the conductor from being affected due to the generation of pores.

[0091] Further, the clamp assembly 200 is made of 304 stainless steel material, and the screw rod 230, the bolt and the nut are made of aluminum alloy material, which ensures the service life and structural stability of the device.

[0092] The use method of the welding device is as follows:

[0093] Before installation, the preliminary operation needs to be completed, including conductor connection, conductor shielding layer manufacturing and reaction force taper cutting steps, and then the mold is installed correspondingly.

[0094] The welding device is installed on the exposed part of the cable conductor 400 to be welded, and after the installation is completed, the electromagnetic induction heating device is powered on, an alternating current of a certain frequency is applied to the coil 110, and at the same time, the cooling circulating water is circulated to reduce the self-heating of the coil. After 5s, the power supply is stopped, and a certain cooling time is given. After cooling, the welding device is removed, and the surface of the cable welding conductor is polished. The conductor is restored, and the finished product is obtained.

[0095] Specifically, the assembling and using steps include:

[0096] The coil 110 is wound.

[0097] Subsequently, the clamp assembly 200 can be placed on both sides of the middle support 300, ensuring that the mounting hole of the mechanical shell of the clamp assembly 200 matches the subsequent connecting components, providing protection and a fixed frame for the entire device. Then, the screw rod 230 is inserted through the docking hole 215 on the mechanical shell, and the screw rod 230 penetrates the entire device, thereby serving as a fixed function. Then, the nut is matched and installed with the threads at both ends of the screw rod 230.

[0098] First, manually tighten the nut to preliminarily fix the components, and then use appropriate tools to tighten the nut in a diagonal and uniform manner. It should be noted that, Figure 1 the embodiments and Figure 4 the embodiments are only schematic diagrams during the assembly process and do not show the schematic diagram after the assembly is completed. If the assembly is completed, the clamp assembly 200 and the support are closely attached in the axial direction. After the nut is fixed, the installation of the entire device is checked again to ensure that the support 300, the coil 110, the clamp assembly 200, and other components are stably installed without loosening.

[0099] After the coil 110 is powered on, the high-frequency current will cause the cable conductor 400 to be welded to generate an alternating magnetic field. The conductor in the alternating magnetic field will generate an induced current and produce a large amount of Joule heat, causing the conductor to rapidly heat up until the melting temperature of the conductor is reached, thereby improving the heating efficiency.

[0100] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0101] The above embodiments only express several implementation ways of the present application, and the description is specific and detailed, but it should not be understood as a limitation to the patent scope. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A welding device, characterized in that, The application relates to an electromagnetic induction heating device for welding cable conductors. The electromagnetic induction heating device comprises: An electromagnetic induction heating device comprising a coil; Two clamp assemblies; A support clamped by the two clamp assemblies, the free ends of two cable conductors to be welded respectively extend into the support through a corresponding clamp assembly, and the coil is wound around the outer circumferential surface of the support; 2. The welding device of claim 1, wherein, The coil generates an alternating magnetic field under the control of high-frequency current, the cable conductors to be welded generate induced current in the alternating magnetic field, and a large amount of Joule heat is generated, so that the cable conductors to be welded are fused and welded in the support.

3. The welding device of claim 2, wherein, The outer side of the coil is sleeved with a first cooling jacket, and the first cooling jacket is configured to circumscribe a water circulation pipeline. The application further comprises:

4. The welding device of claim 3, wherein, A nozzle arranged on the outer circumferential surface of the support and comprising a nozzle first part and a nozzle second part perpendicular to each other, the nozzle first part extends along the radial direction of the support, the first end of the nozzle first part is communicated to the inside of the support, the second end of the nozzle first part is communicated to the first end of the nozzle second part, and the second end of the nozzle second part is configured to face away from the operator. The application further comprises:

5. The welding device of claim 4, wherein, An ejector pipe sleeved on the outer circumferential surface of the nozzle second part, and the first end of the ejector pipe is located on the side of the second end of the nozzle second part away from the nozzle first part, and the second end of the ejector pipe is provided with an air inlet hole.

6. The welding device of claim 4, wherein, The outer side of the first cooling jacket is sleeved with a second cooling jacket, and the second cooling jacket and the first cooling jacket constitute an air cooling pipeline, which is communicated to the air inlet hole. The application further comprises: A cylinder mounted on one of the two clamp assemblies; A heat-resistant pressure pipe arranged in the inside of the nozzle second part, the first end of the heat-resistant pressure pipe extends out of the first end of the nozzle second part and is communicated to the outlet end of the cylinder through a connecting hose, and the second end of the heat-resistant pressure pipe is provided with a jet one-way valve; 7. The welding device of claim 1, wherein, A piston rod mounted on the other of the two clamp assemblies, and the piston of the piston rod can be inserted into the cylinder and continuously compress the gas in the cylinder in the process that the two clamp assemblies approach each other. The clamp assembly comprises: A clamp in a cylindrical shape and spliced by two symmetrical clamp bodies, the clamp has a through groove penetrating in the axial direction, the end surface of the clamp is used for clamping the support and is provided with a first sealing element, the free ends of the cable conductors to be welded pass through the through groove, the inner circumferential surface of the through groove is provided with a second sealing element, and the two sides of each clamp body are provided with an ear plate; 8. The welding device of claim 7, wherein, Two connecting supports, each of which is used for connecting the corresponding ear plates of the two symmetrical clamp bodies.

9. The welding device of claim 7, wherein, The corresponding connecting supports of the two clamp assemblies are connected through a screw rod.

10. The welding device of claim 9, wherein, The connecting support is provided with a groove for clamping the corresponding ear plates of the two symmetrical clamp bodies. The side wall of the groove is provided with a first mounting hole, the ear plate is provided with a second mounting hole corresponding to the first mounting hole, and the clamp assembly further comprises a bolt and a nut, the bolt passes through the first mounting hole and the second mounting hole and is locked by the nut.

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