205results about "Electrode accessories" patented technology

The invention provides a robot welding machine, and belongs to the technical field of welding robots, the robot welding machine comprises a robot body, and further comprises a shunting heat conduction assembly and a supporting cleaning assembly; protective gas forms focused gas flow through shunting and secondary shunting, and gas flow sprayed by the cooling channel and the permeable plate is uniformly mixed under the guidance of a conical space at the front end of the nozzle, so that the concentration distribution of the protective gas above a molten pool is consistent, and the welding seam quality is improved; trace moisture in the protective gas is treated under the action of centrifugal force of the turbofan, and water vapor generated by falling and evaporation of water drops is guided to the periphery of the gas hood and cannot intrude into a molten pool area; the heat conduction cylinder rotates to enable airflow to sweep the whole surface of the contact tube, local overheating and heat dissipation dead angles are avoided, and the normal working temperature of the contact tube is guaranteed; the airflow can clean splashing particles attached to the outer side of the contact tube and the inner wall of the nozzle, the scraping arm can be tightly attached to the cleaning face in the rotating process and can abut against the contact tube, the deformation possibility of the contact tube is reduced, and the continuity and stability of the welding process are guaranteed.

The invention relates to the technical field of building construction welding, in particular to steel structure electric arc welding equipment for building construction. The device comprises a welding gun, a nozzle structure is installed at the bottom of a welding head connecting pipe in a threaded mode, the nozzle structure comprises a hollow spraying pipe and a contact tube extending from the interior of the welding head connecting pipe, an isolation inner pipe is installed in the spraying pipe in a clamped mode, and a gas flow channel formed between the spraying pipe and the contact tube is separated through the isolation inner pipe. The external expansion structure at the lower end of the isolation inner pipe is matched with the height difference between the bottom end of the isolation inner pipe and the bottom end of the spray pipe, physical shielding is formed, and high-temperature splashes entering the external sub-runner during welding are reduced; therefore, adhesion on the inner wall of the outer sub-runner is effectively avoided, the outer sub-runner is kept smooth all the time, and stable conveying of the protective gas is guaranteed.

The invention relates to the technical field of welding devices, and particularly discloses balance oil cylinder welding equipment and a welding process thereof.The balance oil cylinder welding equipment comprises a power system, a welding gun, a wire feeding system, a gas protection system and a cooling system.The welding gun comprises a gun body, a diverter, a conductive sleeve and a nozzle, the conductive sleeve comprises a pipe body, and a through hole penetrating front and back is formed in the pipe body; a threaded section connected with the flow divider is arranged at the tail end of the pipe body, and a plurality of mounting grooves communicated with the through hole are formed in the circumferential surface of the pipe body; the conductive blocks are matched with the mounting grooves in shape, so that the conductive blocks can slide in the radial direction of the pipe body and make contact with the welding wires, the outer sides of the conductive blocks protrude out of the pipe body, pressure is continuously applied through the fastening wires, tight contact between the conductive blocks and the welding wires is kept, poor contact of the welding wires in the abrasion process is avoided, and the service life of the welding wires is prolonged. Therefore, the stability and the quality of the welding process are ensured.

The utility model relates to the field of welding, and provides a welding device for welding in a narrow space. The welding device for welding in the narrow and small space comprises a nozzle, an inclined wire contact tube and a welding wire. The nozzle can vertically extend into the welding space; the inclined wire contact tube is partially inserted into the nozzle in an inclined mode, the extending end of the inclined wire contact tube can be located on one side of an opening in the tail end of the nozzle, a flow guide sleeve is detachably installed on the other side of the opening in the tail end, and the flow guide sleeve can partially shield the opening in the tail end of the nozzle. The welding wire is arranged in the inclined wire contact tube in a penetrating mode and can stretch out of an opening in the tail end of the nozzle so that an electric arc can be formed on one side of the nozzle. According to the welding device for welding in the narrow and small space, the nozzle can directly stretch into the welding space, the welding wire is conveyed to any welding position in the welding space through the inclined wire contact tube, and therefore the flow guide sleeve is additionally arranged on the nozzle to form a lateral gas supply structure, the whole molten pool is reasonably covered with protective gas, and the welding efficiency is improved. The problems of gas turbulence and molten pool protection are solved.

The invention provides a welding device for power plant boiler installation, and belongs to the technical field of boiler installation and welding. Comprising a welding installation part, a knocking auxiliary part is installed on the welding installation part, the knocking auxiliary part is used for preventing the welding installation part from being damaged, an attaching installation part is installed on the welding installation part, a gas facing protection part is installed on the attaching installation part, and the gas facing protection part is used for ensuring the gas protection quality. A swing limiting piece is installed on the attaching installation piece and used for improving operation standardability, and a gas protection prompting piece is installed on the welding installation piece. The gas facing protection part is arranged to be matched with the attaching installation part to be used for limiting the operation standardization of workers, and the carbon dioxide protection quality is guaranteed; the problems that an existing welding device for installing the boiler of the power plant is inconvenient to automatically control and limit gas-facing welding of workers, and welding wires for carbon dioxide protection welding are also prone to being blocked by splashing objects are solved.

The invention discloses a welding device for a longitudinal submerged arc welding pipe, which comprises a steel pipe semi-finished product which is formed by rolling a steel plate through a forming machine, a shaping mechanism which is horizontally arranged and can allow the steel pipe semi-finished product to pass through in a matched manner and form positioning in the circumferential direction of the steel pipe semi-finished product, and a V-shaped roller way conveyor which is arranged on the shaping mechanism, the V-shaped roller way conveyor is arranged at the input end of the shaping mechanism in a butt joint mode and used for feeding semi-finished steel pipe products, the welding mechanism is erected at the output end of the shaping mechanism and used for welding the splicing positions of the semi-finished steel pipe products, the aligning mechanism is arranged between the shaping mechanism and the V-shaped roller way conveyor and used for adjusting the positions of V-shaped grooves, and the limiting guide mechanism is arranged between the welding mechanism and the shaping mechanism and used for limiting the positions of the V-shaped grooves. The invention relates to the technical field of welding equipment. According to the welding device for the longitudinal submerged arc welding pipe, by introducing the alignment mechanism, automatic alignment of a V-shaped groove in a semi-finished steel pipe and the output end of the welding mechanism is achieved, dependence on manual adjustment is reduced, and the alignment precision is improved.

The utility model relates to the technical field of welding equipment, in particular to a welding device for small-space operation, which comprises a grab handle. An adjusting mechanism is arranged on the grab handle and comprises a welding gun head, the welding gun head is rotationally connected to the tail end of the grab handle, a clamping block is fixedly connected to the outer side of the welding gun head, a positioning frame is slidably connected to the tail end of the grab handle, and a clamping groove corresponding to the clamping block in structure is formed in the inner side of the positioning frame. The tail end of the clamping block is fixedly connected with a contact elastic piece, one end of the positioning frame is fixedly connected with a guide rod, and the outer side of the guide rod is sleeved with a reset spring. The angle between the welding gun head and the grab handle can be conveniently adjusted in the using process through the arranged angle adjusting type welding gun head, so that welding operation can be conveniently conducted on a deep area when operation is conducted in a small space, the application range of the device is widened, and the situation that welding equipment is limited by a welding structure is avoided.

The invention discloses a multi-layer cavity full-coverage water cooling robot welding gun which comprises a shell, a double-water-cooling gun neck and a water cooling nozzle. The shell is installed on the mechanical arm so as to be connected with the welding robot. The double-water-cooling gun neck is installed at the front end of the shell and sequentially comprises an inner pipe, an inner isolation pipe, an outer isolation pipe and an outer pipe from inside to outside, an inner ring water path channel is formed between the inner pipe and the inner isolation pipe, an air path channel is formed between the inner isolation pipe and the outer isolation pipe, an outer ring water path channel is formed between the outer isolation pipe and the outer pipe, and the air path channel is communicated with the outer pipe. Double-layer water cooling of the gun neck is achieved, and the cooling effect is improved. The water-cooling nozzle is mounted at the front end of the double-water-cooling gun neck and comprises an inner nozzle pipe and an outer nozzle pipe, a nozzle waterway channel is formed between the inner nozzle pipe and the outer nozzle pipe, and the nozzle waterway channel is communicated with the outer ring waterway channel, so that comprehensive water cooling of the whole welding gun is realized, and the water-cooling efficiency and the water-cooling effect are improved; the service life of parts of the welding gun is prolonged, and 24-hour welding operation all day long is achieved.

The utility model relates to the technical field of welding guns, in particular to a high-current welding gun which comprises a main sleeve, a conductor sleeve is arranged in the main sleeve, an insulating sleeve and an insulating gas screen are arranged on the outer side of the main sleeve in a sleeving mode, the insulating gas screen is arranged at the bottom of the insulating sleeve, a main body shell is arranged on the outer side of the insulating sleeve and the outer side of the insulating gas screen in a sleeving mode, and a nested shell is arranged on the lower portion of the main body shell in a sleeving mode. The lower portion of the nesting shell is connected with a nozzle, the gas channel is defined by the outer side of the main sleeve, the insulating sleeve, the insulating gas screen and the main body shell and communicated with the nozzle, the gas inlet pipe is communicated with the gas channel, the water inlet pipe and the water return pipe are both communicated with the cooling water channel, and protective gas is introduced into the gas channel. The protective gas can cool the electric conductor and can reach the nozzle, the cooling range in the welding gun is expanded, the cooling water channel is formed in the outer side of the gas channel, heat exchange with the protective gas can be conducted while the electric conductor is cooled, and the use temperature of the welding gun is remarkably reduced.

The application discloses a kind of automatic welding production line of round tube and bush, it is related to welding production line technical field, including round tube conveying line, bore assembly being arranged at the end of first conveying branch line and second conveying branch line, chip suction assembly being arranged at the other end of second conveying branch line, and welding assembly being arranged at the both ends of third conveying branch line, it is laterally transferred round tube between adjacent conveying branch line;The technical advantage of the application is: by setting round tube conveying line and round tube transfer line vertically and horizontally, first air cylinder is arranged at the both ends of transfer frame, barb is arranged at the end of transfer frame upward, efficient transfer is realized in the way of height difference between bore assembly, chip suction assembly and welding assembly;By setting pneumatic chuck, rotary drive part and welding locking piece, the circumferential rotation control of round tube is realized, by setting bushing box and bushing positioning structure, automatic taking of bushing is realized, and then full-automatic welding of round tube and bushing is realized, and welding efficiency is improved.

A contact tip for welding includes: a tip case; a power supply tip that is housed in the tip case and supplies power to a welding wire supplied from a side close to one end of the power supply tip while holding the welding wire at another end opposite to the one end; and a guide that presses the power supply tip from the side close to the one end and houses the power supply tip in the tip case, in which the power supply tip has a shape in which an outer diameter from a press point pressed by the guide to a fulcrum in contact with the tip case increases from the press point toward the fulcrum, and the power supply tip is rotated about the fulcrum by pressing of the guide to hold the welding wire at the other end.

The invention relates to a wear part for an arc torch, plasma torch or plasma cutting torch, characterised in that the wear part or at least one part or a region of the wear part consists of an alloy formed from silver and zirconium, silver and hafnium, or silver and zirconium and hafnium.

The utility model relates to the technical field of large roller surfacing, in particular to a high-temperature-resistant submerged-arc welding gun device for large roller surfacing repair, which comprises a welding flux blanking hose, a welding flux blanking steel pipe, a wire feeding system, a conducting rod, a heat insulation mechanism, a heat preservation box, a blanking positioning mechanism, a three-way diverter, a contact tube and a contact tube protection sleeve, the heat insulation mechanism comprises a steel plate shell and heat insulation fire-resistant cotton, the steel plate shell is horizontally arranged between the heat preservation box cover and the wire feeding system, the heat insulation fire-resistant cotton is arranged on the side, facing the wire feeding system, of the steel plate shell, and the welding flux discharging positioning mechanism is arranged on the outer circumference of a conducting rod in the heat preservation box. The surfacing welding device has the advantages that the surfacing welding device can go deep into a high-temperature heat preservation furnace for surfacing welding, and the stability of welding bead forming in the surfacing welding process is improved.

A contact tip reshaping device 3 comprises: a core rod 37 having a circular cross-section; and three or more pressing metal pieces 36 disposed so as to be arranged in the circumferential direction along an outer circumferential surface 23c of a contact tip 23. Each pressing metal piece 36 has an arc-shaped shaping surface 36a. A shaping unit 30 includes: a guide part 31b for guiding each pressing metal piece 36 in the radial direction of the contact tip 23; and a shaping part 30 for causing the plurality of pressing metal pieces 36 to advance / retreat in the guidance direction of the guide part 31b. Shaping loads from the plurality of pressing metal pieces 36 are simultaneously applied to the outer circumferential surface 23c of the contact tip 23.

The invention discloses a double-side-arranged type double-layer inner side bent nozzle device and a narrow gap welding method thereof.The nozzle device is composed of an outer-layer front nozzle pipe and an inner-layer front nozzle pipe which are arranged in the vertical direction, and each nozzle pipe is formed by connecting an upper connecting section, a middle vertical section and a lower bent section; wherein the middle vertical section and the lower bent section both extend into the narrow-gap welding groove and can be used in the full groove depth; the lower bent sections of the inner-layer front nozzle pipe and the inner-layer rear nozzle pipe are both bent towards the inner side and are respectively aligned with the lower section of the contact tube of the welding torch from the front side and the rear side, and the lower bent sections of the outer-layer front nozzle pipe and the outer-layer rear nozzle pipe are both bent towards the inner side and are respectively aligned with a welding arc area in the groove obliquely downwards from the front side and the rear side; and the inner / outer layer nozzle air flow is vectorized and adjusted to protect a welding high-temperature area, meanwhile, the contact tube is directly cooled, and the contact tube and the lower end face of the welding torch body are prevented from being impacted by welding high-temperature hot air, so that the narrow-gap welding quality is improved, and the service life of the welding torch contact tube is prolonged.

The utility model provides a welding gun nozzle structure and a welding gun. The welding gun nozzle structure comprises a gun barrel, a welding nozzle and a clamping assembly. A first through groove is formed in the gun barrel. The welding nozzle is inserted into the end, close to the first through groove, of the gun barrel. The clamping assembly comprises a first limiting piece and a movable piece, the first limiting piece is slidably installed in the first through groove, the gun barrel is sleeved with the movable piece, and the movable piece can slide relative to the gun barrel. And when the movable part slides away from the first through groove, the welding nozzle can be inserted into or separated from the gun barrel. After the welding gun nozzle is inserted into the gun barrel, when the movable part slides to the position for shielding the first through groove, the first limiting part can be pushed to limit movement of the welding nozzle. According to the welding gun nozzle structure, the welding nozzle does not need to rotate in the process that the welding nozzle is installed on the gun barrel. The situation that workers need to repeatedly adjust the insertion angle of the gun barrel when assembling the gun barrel is avoided, the installation difficulty of the welding gun nozzle and the gun barrel is lowered, and the installation efficiency is improved.

The utility model discloses a cooling nozzle and a welding gun. The cooling nozzle comprises a connecting seat, a nozzle pipe body and a nozzle head, the connecting base is fixedly installed at the end of the welding gun neck, a water receiving pipe protrudes out of the front end of the connecting base and communicates with a water path of the welding gun neck, and a first water inlet hole and a first water outlet hole are formed in the water receiving pipe. The nozzle pipe body is connected to the connecting base in an inserted mode and comprises an inner pipe and an outer pipe, a water channel is formed between the inner pipe and the outer pipe, the water channel is communicated with the first water inlet hole and the first water outlet hole, and heat exchange cooling of the cooling nozzle is achieved. The nozzle head is detachably installed at the front end of the nozzle pipe body so that the nozzle head can be replaced conveniently.

To provide a contact tip which is hardly worn even when used for aluminum welding and to which spatters are hardly stuck.SOLUTION: The split type contact tip is formed by screwing a tip 20 made of nickel silicon copper to the tip of an adapter 10 made of copper alloy. It is preferable that the copper alloy constituting the adapter 10 is chromium copper or zirconium chromium copper, and the nickel silicon copper constituting the distal end tip 20 has a composition of nickel: 1.0 to 5.0% (mass%, the same applies hereinafter), silicon: 0.4 to 2.0%, and the balance: copper and inevitable impurities.SELECTED DRAWING: Figure 1

In the welding contact tip of the present invention, the entire tip body is made of a copper alloy having a composition of Ni: 1.0 to 5.0%, Si: 0.4 to 2.0%, and a balance: Cu and unavoidable impurities in % by mass. It is possible to improve the service life so that the service life is 6 to 8 times longer than that of the conventional one while suppressing the manufacturing cost. The total quantity of unavoidable impurities is preferably 0.3% or less. In addition, it is particularly preferable that Ni is in a range of 2.0 to 4.0% and Si is in a range of 0.8 to 1.5%.

A correcting device is used for correcting a welding gun. The welding gun comprises a welding handle, a gun body and a gun head, and the correcting device comprises a fixing element used for positioning the welding gun by fixing the welding handle of the welding gun; the alignment element is used for providing a correction reference position; the correcting assembly comprises a grabbing element used for grabbing at least one part of the welding gun at the preset position of the welding gun, a driving mechanism used for driving the grabbing element to move and a connecting rod element connected between the driving mechanism and the grabbing element. The driving mechanism is configured to enable the connecting rod element to move up and down in the vertical direction, move left and right in the transverse direction perpendicular to the vertical direction and parallel to the connecting rod element, and move front and back in the longitudinal direction perpendicular to the vertical direction and the transverse direction. And the grabbing element is configured to move along with the movement of the connecting rod element, so that the gun head of the welding gun is driven to move to a position aligned with the correction reference position of the alignment element, and the welding gun is corrected.

The utility model relates to an automatic argon arc welding torch of small drift inner wall surfacing cooling circulation system, including welding torch body, ceramic mouth, tungsten electrode and cooling circulation mechanism, the bottom of welding torch body is equipped with ceramic mouth, the bottom of ceramic mouth is equipped with tungsten electrode, and is equipped with the cooling circulation mechanism for welding torch cooling in welding body, sends the cooling liquid into the liquid inlet pipe through the external drive pump, the cooling liquid flows into the spiral liquid pipe through the liquid inlet pipe, the heat of welding torch is passed through red copper heat transfer cylinder, and the heat is quickly conducted to the spiral liquid pipe, and the low temperature cooling liquid is pumped into the spiral liquid pipe from the liquid inlet pipe, absorbs the heat when the cooling liquid flows through the surface of the welding torch part, the high temperature cooling liquid flows out from the liquid outlet pipe, and the recycling use after the cooling through the external radiator, thereby taking away the heat of welding torch body, can long -time welding work, the cooling circulation mechanism is located in the welding torch body, and the unique gun body structure design can be flexible and deep into the narrow space.

A nozzle assembly for a welding torch is disclosed. The nozzle assembly comprises a nozzle, a contact tip, and a gas diffuser assembly. The gas diffuser assembly comprises a gas diffuser, coupled to an insulator. The gas diffuser is also coupled to a gooseneck and the contact tip. The nozzle is coupled to the gas diffuser assembly, such that the contact tip is retained within the nozzle. The nozzle and gas diffuser assembly further include complementary engagement features to couple the nozzle to the gas diffuser assembly. The nozzle also includes a spatter deflector configured to deflect or block spatter from obstructing gas holes of the gas diffuser assembly.

The invention discloses a detachable split type air plug, and relates to the technical field of argon arc welding gun accessories. The air plug comprises the air plug flow guide part and the air plug screen which are detachably connected, so that the air plug screen can be quickly replaced, only the front-section screen needs to be replaced, and the consumption of accessories is greatly reduced. The air plug screen is specially designed, and the shape, the size and the distribution of meshes are optimized, so that protective gas is uniformly sprayed out, and the gas protection effect is remarkably improved. Meanwhile, compared with a traditional nozzle, the gas plug improves the gas saving effect by 20%, and the gas utilization rate is effectively improved. By replacing the screens of different specifications, the requirements of various welding working conditions for the gas flow and the protection effect can be met, and practicability and economical efficiency are both achieved.

The utility model discloses a connecting structure and a welding gun. The connecting structure comprises a connecting block, an elastic connecting piece and a connecting sleeve. The connecting sleeve comprises an inner sleeve and an outer sleeve, a first cavity and a second cavity which are communicated are formed in the outer sleeve, and the diameter of the first cavity is larger than that of the second cavity; the inner sleeve is arranged and attached to the interior of the first cavity. A third cavity and a fourth cavity which are communicated with each other are formed in the inner sleeve, and the fourth cavity is communicated with the second cavity; the elastic connecting piece is arranged in the fourth cavity, and the connecting block is arranged in the third cavity and the fourth cavity and connected with the elastic connecting piece. The connecting block comprises an open section and a closed section which are connected, when the connecting block is at the first position, the closed section isolates the third cavity from the fourth cavity, and when the connecting block is at the second position, the elastic connecting piece is compressed, and the third cavity is communicated with the fourth cavity through the open section. The problems that when one end of the connecting piece is assembled and disassembled, the assembling and disassembling efficiency is low, and original stored objects in the other end of the connecting piece are prone to leaking in the assembling and disassembling process are solved.

A rotary grip (9) grips a nozzle (11) in a component replacement area (V2) in a forward rotation or in a reverse rotation about a central axis of the nozzle (11). A rotary storage (4) stores a plurality of nozzles (11) at predetermined intervals in a circumferential direction about an axis of rotation (C1) and moves each of the plurality of nozzles (11) to a component supply area (V1) by rotating about the axis of rotation (C1). A component transporter (7) transports each nozzle (11) from the component supply area (V1) to the component replacement area (V2). A clutch assembly (8) transmits rotation and blocks transmission of rotation between the rotary storage (4) and a drive motor (5).

To efficiently perform sound welding by suppressing weld defects while suppressing a welding amount and preventing the occurrence of high temperature cracks in flat position welding.SOLUTION: In a narrow groove 50 of horizontal welding, a lower groove angle θ on a lower plate 5A side is set to 35 ° to 45 ° upward from the horizontal, and an upper groove angle α is set to be larger than the lower groove angle θ in a range of 2 ° to 5 °. In the inclined narrow groove welding method, a root gap RG of a narrow groove 50 is set in a range of 9 mm-12 mm, a backing metal 6 is provided which is attached to a lower plate 5A and an upper plate 5B and positions a groove surface lower end part 5A of the upper plate 5B and sets a groove angle and the root gap RG, a contact tip having a wire hole for feeding a weld wire into the narrow groove 50 is inserted, and the lower plate 5A and the upper plate 5B are welded without rotating the contact tip around a nozzle shaft in one pass in the narrow groove 50.SELECTED DRAWING: Figure 3

The present invention relates to the field of automatic welding technology, and in particular to a double-wire welding gun, which solves the problem of large friction and severe wear between the welding wire and the inner wall of the wire feeding tube. A double-wire welding gun comprises a gun body, a joint and two conductive nozzles distributed in parallel. Two wire feeding channels distributed in parallel are opened in the gun body, and springs are arranged in the wire feeding channels. The outer sides of the two springs are sleeved with locking rings. One end of the conductive nozzle is fixedly connected to a conductive seat, and one side of the conductive seat is fixedly connected to a conductive rod. The present invention has a built-in spring in the wire feeding channel, and the welding wire contacts the spring during the welding process. The surface of the spring is an arc surface with small friction. In addition, the surface hardness of the spring is high and the wear resistance is good, which reduces the friction between the welding wire and the wire feeding channel and can significantly improve the life of the welding gun. In addition, the gun body and the conductive part are connected by a spring, which has good flexibility, can conform to the bending of the welding wire, and the wire feeding is relatively smooth.

To provide a contact tip exchanging apparatus which can attach and detach a contact tip relative to a torch main body of a welding torch and can be formed in a compact shape as a whole.SOLUTION: A tip case 3 stores a plurality of contact tips 10 in such a posture that a center axis is elongated in a vertical direction and the tips are directed to the lower side, linearly in a horizontal direction. A reciprocating driving mechanism 5 reciprocates the tip case 3 in a parallel arrangement direction of the contact tips 10 and allows the tip case to advance or retreat to a tip supply space S2. A tip taking-out mechanism 6 takes out the contact tips 10 to the upper side from the tip case 3 of such a state as to advance to the tip supply space S2. A holding rotary mechanism 4 holds and rotates the contact tips 10 taken-out by the tip taking-out mechanism 6 and, thereby, screws and connects the contact tips 10 to a torch main body 11 or removes the contact tips 10 from the torch main body 11.SELECTED DRAWING: Figure 6

The utility model discloses a double-material clamping welder, relates to the technical field of welding equipment, and is mainly used for solving the problem that welding acting points are unbalanced due to the fact that a gun head of an existing argon arc welding gun is directly pressed on an uneven corrugated steel plate. The upper end of the welding gun body is a gun tail, the lower end of the welding gun body is a gun head, a control handle is connected to the welding gun body, a hollow pressing pipe is movably connected to the outer portion of the welding gun body in a sleeved mode, and an elastic piece capable of providing vertically-downward elastic force for the welding gun body is further arranged in the hollow pressing pipe. According to the double-material clamping welding device, the peripheral area of a welding point is pressed through the hollow pressing pipe, a certain amount of pressure is kept on the ceramic nozzle of the gun head all the time, the ceramic nozzle can be prevented from being damaged, meanwhile, the quality and size of the welding point are not changed, and the appearance of the welding point is kept attractive.