CN116652349A - Electrode for resistance spot welding of metal thin-wall structure - Google Patents

Abstract

The application discloses an electrode for resistance spot welding of a metal thin-wall structure, which comprises the following components: one end of the electrode body is provided with a welding plane for contacting a welded piece, the welding plane is provided with an air outlet, and a gas channel communicated with the air outlet is formed in the electrode body; the conductive gasket is in a strip shape and comprises a first end head and a second end head, the first end head and the second end head are covered on the welding plane, and an exhaust hole communicated with the air outlet is formed in the conductive gasket; and the clamping mechanism is used for clamping and fixing the first end head and the second end head of the conductive gasket on the electrode body. Through set up gas channel and set up the venthole on the electrode tip, at welded in-process, the protection gas can spout and form the protection air current layer on the conductive pad, weakens the oxidation of conductive pad, reduces extra heat and produces, can take away unnecessary heat simultaneously, realizes the cooling, reduces the risk that oxidation and fusing appear in the conductive pad in the welding process, makes solder joint's intensity and stability obtain the guarantee.

Description

Electrode for resistance spot welding of metal thin-wall structure

Technical Field

The application relates to the field of metal resistance spot welding, in particular to an electrode for spot welding of a metal honeycomb structure.

Background

Spot welding technology has been widely used in many fields such as electronic devices, aerospace, automobiles, etc., wherein electrodes used in spot welding technology modes using resistance heat as a heat source such as resistance spot welding and energy storage spot welding are generally divided into an upper electrode and a lower electrode, the upper electrode and the lower electrode respectively contact the surface of a workpiece to be welded, and the materials, shapes, sizes and other functions of the corresponding upper electrode and the lower electrode are different due to the differences of materials, shapes, sizes and other physical and chemical properties of the workpiece to be welded. The metal honeycomb seal structure is one of the common structures in the field of aeroengine manufacturing, and consists of a metal honeycomb and a shell, ring or plate carrying the metal honeycomb, and the quality of the structure is important for products such as aeroengines, gas turbines and the like. The structure is typically manufactured using a high temperature vacuum brazing process, and the metal honeycomb is spot welded to the shell, ring or plate prior to brazing. The metal honeycomb is made of high-temperature alloy material, the wall thickness is only 0.05-0.08 mm, and the welding difficulty is high, so that a special electrode is required to be designed.

The scheme of installing the copper sheet on the electrode has been adopted in the prior art, the copper sheet can cushion the pressure of electrode to honeycomb structure, avoid electrode to press the honeycomb of wall thickness weak in welding process, because superalloy fusing point is higher, in welding process, the oxidation all easily appears in the surface of metal honeycomb, solder joint, electrode and the copper sheet of filling on the electrode, after the copper sheet oxidation, resistance increase, when the next electric current that approaches passes through, the copper sheet produces more heat, further accumulate oxidation, even because overheated copper sheet that leads to the melting of destruction, resistance increase still can lead to the current loss simultaneously, deteriorate the quality of solder joint between metal honeycomb structure and the work piece, lead to its unstable or intensity reduction.

Disclosure of Invention

The application provides an electrode for resistance spot welding of a metal thin-wall structure, which aims to solve the technical problems that oxidation reaction occurs in the process of spot welding operation of the metal thin-wall structure, so that a copper sheet is fused and damaged, and the strength of a welding spot is low.

The application provides an electrode for resistance spot welding of a metal thin-wall structure, which comprises an electrode body, wherein a welding plane is formed at one end of the electrode body, an air outlet hole is formed in the welding plane, and an air channel communicated with the air outlet hole is formed in the electrode body; the conductive gasket is in a strip shape and comprises a first end head and a second end head, the first end head and the second end head are covered on the welding plane, and an exhaust hole communicated with the air outlet hole is formed in the conductive gasket; and the clamping mechanism is used for clamping and fixing the first end head and the second end head of the conductive gasket on the electrode body.

By adopting the scheme, firstly, the conductive gasket is covered on the welding plane, the conductive gasket is in surface contact with the piece to be welded, partial discharge is not easy to occur, and the phenomenon that partial discharge occurs between the electrode and the piece to be welded due to point contact, so that the thin-wall structure is burnt or burned is avoided;

secondly, a gas channel is arranged on the electrode tip, and a gas outlet hole is arranged on the electrode tip, so that protective gas can enter from the gas channel in the welding process and is sprayed onto the conductive gasket from the gas outlet hole to form a protective gas flow layer, the conductive gasket is isolated from air, and the contact between the conductive gasket and oxygen is reduced, so that the oxidation of the conductive gasket is reduced, and the generation of extra heat is reduced;

meanwhile, the protective air flow passes through the electrode body, the conductive gasket and the thin-wall structure to be welded, so that redundant heat can be taken away, cooling is realized, and the oxidation probability of the conductive gasket is weakened while the temperature is controlled; under the combined action of the two means of isolating oxygen and controlling temperature, the risk of oxidation and fusing of the conductive gasket in the welding process can be reduced, and the strength and stability of welding spots are ensured.

Further, a transition chamfer is formed on the edge of the welding plane of the electrode body, a side blowing hole communicated with the gas channel is formed in the transition chamfer, and an included angle between the side blowing Kong Chuqi direction and the welding plane is an acute angle.

By adopting the scheme, the protective gas can act on the periphery of the welding spot through the side blowing holes, so that the oxidation reaction progress of the thin-wall structure around the welding spot is weakened, and the thin-wall structure workpiece can be protected; meanwhile, the side blowing holes and the air outlet holes are distributed at different positions of the electrode body, so that the contact area of the protective gas and the electrode body is larger, a better heat dissipation effect can be achieved on the electrode body, the electrode tip is prevented from being too high in temperature, and a guide air flow can be formed to guide the protective gas sprayed out of the air outlet holes to flow around the surface of the conductive gasket.

Further, the electrode body comprises an electrode head, and the welding plane and the air outlet hole are positioned on the electrode head; the connecting seat is detachably connected with the electrode head, a mounting hole communicated with the air outlet hole is formed in the connecting seat, and the clamping mechanism is arranged on the connecting seat; one end of the connecting rod is detachably arranged in the mounting hole, the other end of the connecting rod is connected with a protective gas source, a through hole is formed in the connecting rod along the length direction, and the through hole is communicated with the mounting hole to form the gas channel; the middle section of the conductive gasket wraps the surface of the electrode head, and the first end and the second end of the conductive gasket are respectively fixed on the surface of the connecting seat through the clamping mechanism.

By adopting the scheme, the electrode tip is detachably connected with the connecting seat, when the electrode tip is damaged, the electrode tip can be independently replaced, the cost is low, and meanwhile, different types of electrode tips can be flexibly configured for different types and shapes of workpieces to be welded, so that the application range is wider; the connecting seat is used as a connecting structure for connecting the electrode head and the connecting rod, so that stable connection of the electrode head and the connecting rod can be realized, meanwhile, the connecting seat is also used as a carrier of the clamping mechanism, the connecting seat can be kept stable under the action of the clamping force of the clamping mechanism, deformation is not easy to occur, the risk that the clamping mechanism repeatedly clamps the electrode body to deform to cause blockage of a gas channel can be avoided, and the stability is good; the middle section of the conductive gasket wraps the electrode head, two ends of the conductive gasket are clamped and fixed on the connecting seat, and the mounting mode ensures that the conductive gasket is stably mounted and simultaneously can also enable the conductive gasket to play an auxiliary fixing role on the electrode head, so that the electrode head is prevented from being separated from the connecting seat in the welding process.

Further, the mounting hole is embedded with a seat body reinforcing sleeve, the through hole is embedded with a rod body reinforcing sleeve, the hardness of the rod body reinforcing sleeve and the hardness of the seat body reinforcing sleeve are both larger than those of the connecting seat and the connecting rod, and the rod body reinforcing sleeve, the seat body reinforcing sleeve and the air outlet hole are sequentially communicated.

Through adopting above-mentioned scheme, for the good electric conductivity of electrode body, connecting seat, connecting rod need use copper to make, and copper's hardness and fusing point are all lower, and the effect of high temperature in the welding process is easy to take place to warp, can strengthen holistic stability through setting up great pedestal reinforcing sleeve pipe of hardness and body of rod reinforcing sleeve pipe to constitute internal stay shape structure in order to restrain connecting seat, connecting rod deformation.

Further, a voltage stabilizing cavity communicated with the air outlet hole is arranged in the electrode head, and the seat body reinforcing sleeve extends out of the connecting seat and extends into the voltage stabilizing cavity.

Through adopting above-mentioned scheme, after the shielding gas gets into from the gas passage, at first enters into the steady voltage chamber, then enters into the venthole from the steady voltage chamber again, can stabilize the pressure fluctuation of shielding gas in the steady voltage chamber, make from venthole spun shielding gas flow can keep stable, the reinforcing is to the suppression of conductive pad and welding face oxidation.

Further, the clamping mechanism comprises a first clamping plate, a second clamping plate and a connecting seat, wherein the first clamping plate is used for clamping a first end head of the conductive gasket, one end of the first clamping plate is hinged with the connecting seat, and the other end of the first clamping plate is a free end; the second clamping plate is used for clamping the second end head of the conductive gasket, one end of the second clamping plate is hinged with the connecting seat, the other end of the second clamping plate is a free end, and the axis of the second clamping plate hinged with the connecting seat is parallel to the axis of the first clamping plate hinged with the connecting seat; the locking piece is arranged at the free ends of the first clamping plate and the second clamping plate; the first clamping plate and the second clamping plate are rotated so that the free ends of the first clamping plate and the second clamping plate are close to or far away from each other, and when the two free ends meet, the first clamping plate and the second clamping plate are locked through the locking piece.

By adopting the scheme, one ends of the first clamping plate and the second clamping plate are hinged with the connecting seat, and when the locking piece and the conductive gasket are unlocked, the first clamping plate and the second clamping plate cannot be separated from the connecting seat, so that repeated disassembly and assembly are not needed, and the use is more convenient; the free ends of the first clamping plate and the second clamping plate share a locking piece, and when the conductive sheet is replaced, only one unlocking and locking action is needed, so that the steps of replacing the conductive gasket are fewer.

Further, the locking piece comprises an elastic body which is fixed on the first clamping plate, and the expansion and contraction direction of the elastic body is parallel to the rotation axis of the first clamping plate; the locking block is connected with the elastic body, one side of the locking block, which is far away from the elastic body, is a working surface, and the working surface is a smooth convex spherical surface; the locking groove is positioned on the second clamping plate and is used for being matched with the locking block; the working surfaces of the locking blocks are extruded by the surfaces of the second clamping plates through the rotation intersection of the first clamping plates and the second clamping plates, so that the elastic bodies are compressed, and when the locking blocks move to the position opposite to the locking grooves, the working surfaces of the locking blocks enter the locking grooves under the action of the tension of the elastic bodies, so that the locking of the first clamping plates and the second clamping plates is realized.

By adopting the scheme, in the locking process, the first clamping plate and the second clamping plate are rotated, when the first clamping plate and the second clamping plate are intersected, the spherical working surface is contacted with the surface of the second clamping plate, a component force parallel to rotation is generated, the elastic piece is further compressed, the working surface continues to slide on the surface of the second clamping plate, and when the working surface slides to a position where the locking block is opposite to the locking groove, the locking block enters the locking groove under the action of tension of the elastic body, so that the locking is realized; when the locking block is separated from the locking groove, unlocking is completed; the whole locking and unlocking process does not need to manually control the locking piece, and the locking and unlocking can be completed only by rotating the first clamping plate and the second clamping plate, so that the locking and unlocking speed is high, and the operation is convenient.

Further, the first clamping plate comprises a first clamping part for pressing the clamping gasket and a first locking part for locking, wherein an inserting groove is formed in the first locking part, and a mounting hole for accommodating the elastic body is formed in the inserting groove; the second clamping plate comprises a second clamping part for pressing the clamping gasket and a second locking part for locking, an inserting protrusion for inserting and matching with the inserting groove is formed on the second locking part, and the locking groove is located on the inserting protrusion.

By adopting the scheme, the first clamping part and the second clamping part are used for clamping the conductive gasket, the first locking part and the second locking part are used for being matched with the locking piece for locking, the two functional areas are not mutually interfered, and the clamping stability and unlocking convenience can be ensured; the surface of the inserting protrusion and the inner wall of the inserting groove are in contact with the conductive gasket, friction force can be increased in a mode of increasing contact area, and clamping of the conductive gasket is more stable.

Further, the locking pieces are provided with at least two groups, the elastic body of each group of locking pieces is arranged on different sides of the inner wall of the inserting groove, and the locking grooves of each group of locking pieces are formed in different sides of the inserting protrusions.

Through adopting above-mentioned scheme, multiunit locking piece can lock from the different directions, and the stability of locking is better, can realize the unblock and the locking of multiunit locking piece at the in-process of rotatory first grip block and second grip block, and the operation is comparatively convenient.

Further, fastening ribs are respectively arranged on two sides of the electrode body, and the first end and the second end of the conductive gasket are respectively covered on the fastening ribs; the first clamping part and the second clamping part are respectively provided with a fastening groove corresponding to the fastening convex edge, and when the first clamping plate and the second clamping plate are locked, the fastening convex edge jacks the conductive gasket into the fastening grooves, so that the fastening convex edge and the inner wall of the fastening grooves jointly clamp the conductive gasket.

Through adopting above-mentioned scheme, the setting of fastening protruding edge and fastening recess can increase the area of contact between fixture and electrode body and the conductive gasket, and then increases frictional force, makes the centre gripping of conductive gasket more stable.

The application has the following beneficial effects:

1. according to the application, the gas channel is arranged on the electrode tip, the gas outlet hole is arranged on the electrode tip, and in the welding process, the protective gas can be sprayed onto the conductive gasket to form the protective gas flow layer, so that the oxidation of the conductive gasket is weakened, the generation of extra heat is reduced, and meanwhile, the protective gas flow can take away the extra heat through the electrode body, the conductive gasket and the thin-wall structure to be welded; under the combined action of two means of isolating oxygen and controlling temperature, the risk of oxidation and fusing of the conductive gasket in the welding process can be reduced, and the strength and stability of welding spots are ensured;

2. by arranging the side blowing holes, the protective gas can act on the periphery of the welding spots through the side blowing holes, so that the oxidation reaction progress of the thin-wall structure around the welding spots is weakened, and the thin-wall structure workpiece can be protected;

3. the clamping mechanism can ensure stable clamping of the conductive gasket, the whole locking and unlocking process does not need to manually control the locking piece, the locking and unlocking can be completed only by rotating the first clamping plate and the second clamping plate, the locking and unlocking speed is high, and the conductive gasket can be conveniently and quickly replaced.

In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic diagram of an assembled structure of an electrode for resistance spot welding of a metallic thin-walled structure in accordance with a preferred embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a resistance spot welding electrode of a thin metal wall structure in accordance with a preferred embodiment of the present application;

FIG. 3 is an exploded schematic view of an electrode for resistance spot welding of a thin metal wall structure in accordance with a preferred embodiment of the present application;

fig. 4 is a schematic view showing an internal structure in a transparent manner in fig. 3.

Legend description:

1. a conductive pad; 2. an electrode body; 21. an electrode head; 211. welding a plane; 212. an air outlet hole; 213. a side blowing hole; 214. a pressure stabilizing cavity; 22. a connecting seat; 221. a seat reinforcing sleeve; 23. a connecting rod; 231. a rod body reinforcing sleeve; 3. a clamping mechanism; 31. a first clamping plate; 311. a first clamping part; 312. a first locking part; 313. a plug-in groove; 32. a second clamping plate; 321. a second clamping portion; 322. a second locking part; 323. inserting the bulge; 33. a locking member; 331. an elastomer; 332. a locking groove; 34. a cylindrical pin; 35. fastening the convex edges; 36. fastening grooves.

Detailed Description

Embodiments of the application are described in detail below with reference to the attached drawing figures, but the application can be practiced in a number of different ways, as defined and covered below.

As shown in fig. 1, the embodiment provides an electrode for resistance spot welding of a metal thin-wall structure, which is applied to a welding process of the resistance spot welding of the metal thin-wall structure, in particular to a welding process of a metal honeycomb seal member structure in the field of aeroengine manufacturing, wherein the structure is generally manufactured by adopting a high-temperature vacuum brazing process, and the metal honeycomb spot welding is required to be positioned on a shell, a ring or a plate before brazing. The electrode for resistance spot welding with the metal thin-wall structure comprises an electrode body 2, a conductive gasket 1 and a clamping mechanism 3 for clamping and fixing the conductive gasket 1 on the electrode body 2, wherein during welding, the conductive gasket 1 is in direct contact with a piece to be welded, and current is conducted to the piece to be welded through the electrode body 2 and the conductive gasket 1.

As shown in fig. 1, the electrode body 2 includes an electrode head 21, a connection base 22 and a connection rod 23 which are sequentially connected, and an electrode clamping handle on the welding device clamps the connection rod 23 to support the electrode body 2 during welding operation. One side of the electrode tip 21, which is far away from the connecting seat 22, is provided with a welding plane 211, the conductive gasket 1 is covered on the welding plane 211, and when welding, the conductive gasket 1 positioned at the welding plane 211 contacts the welding surface of a workpiece to be welded.

In this embodiment, the conductive gasket 1 is in a strip shape, and includes a first end and a second end, and the conductive gasket 1 is made of copper, so that the conductive gasket has good electrical conductivity and thermal conductivity, is helpful to ensure the stability of welding quality, and meanwhile, has lower hardness, so that the metal thin-wall structure can be prevented from being crushed or scratched in the welding process. In other specific embodiments, gold, silver, or elemental metals or alloy materials that achieve the same result may be used. Optionally, the conductive pad 1 is a copper wire braid, and because of the fine pores densely distributed, the conductive pad 1 can uniformly distribute current on the welding surface while having good air permeability, and in other specific embodiments, a similar effect can be achieved by forming fine holes on the metal sheet.

As shown in fig. 2, the electrode tip 21 is narrowed along the direction of the rectangular slot with a rounded corner to form a circular arc boss with an isosceles trapezoid cross section, the boss is a welding plane 211, the welding plane 211 is provided with an air outlet hole 212, a mounting hole communicated with the air outlet hole 212 is formed in the connecting seat 22, a through hole is formed in the connecting rod 23 along the length direction, and the through hole is communicated with the mounting hole to form a gas channel. In the welding process, the gas channel is communicated with a protective gas source, protective gas can enter from the gas channel and is sprayed out from the gas outlet 212 onto the conductive gasket 1 to form a protective gas flow layer, the conductive gasket 1 is isolated from air, the oxidation of the conductive gasket 1 is further weakened by reducing the contact between the conductive gasket 1 and oxygen, the generation of extra heat is reduced, meanwhile, the protective gas flow passes through the electrode body 2, the conductive gasket 1 and the thin-wall structure to be welded, the extra heat can be taken away, the temperature is reduced, and the oxidation of the conductive gasket 1 is weakened after the temperature is controlled; under the combined action of the two means of isolating oxygen and controlling temperature, the risk of oxidization and fusing of the conductive gasket 1 in the welding process can be reduced, and the strength and stability of welding spots are ensured.

As shown in fig. 1 and 2, transition chamfers are formed on two sides of the welding plane 211, side blowing holes 213 communicated with the gas channels are formed on the transition chamfers, the gas outlet direction of the side blowing holes 213 and the included angle of the welding plane 211 are acute angles, and protective gas can act on the periphery of the welding point through the side blowing holes 213, so that the oxidation reaction progress of the metal thin-wall structure around the welding point is weakened, and the metal thin-wall structure can be protected.

As shown in fig. 2, a pressure stabilizing cavity 214 communicated with the gas channel is arranged in the electrode head 21, the gas outlet hole 212 and the side blowing hole 213 are both communicated with the pressure stabilizing cavity 214, and after the protective gas enters from the gas channel, the protective gas firstly enters into the pressure stabilizing cavity 214 and then enters into the gas outlet hole 212 from the pressure stabilizing cavity 214, so that the pressure fluctuation of the protective gas can be stabilized in the pressure stabilizing cavity 214.

As shown in fig. 2, the mount hole is embedded with a seat body reinforcing sleeve 221; the through hole is embedded with a rod body reinforcing sleeve 231; the hardness of the rod body reinforcing sleeve 231 and the hardness of the seat body reinforcing sleeve 221 are both greater than those of the connecting seat 22 and the connecting rod 23, the rod body reinforcing sleeve 231, the seat body reinforcing sleeve 221 and the air outlet 212 are sequentially communicated, the connecting seat 22 and the connecting rod 23 are required to be made of copper for good conductivity of the electrode body 2, the hardness and the melting point of copper are both low, deformation is easy to occur under the action of high temperature in the welding process, the stability of the electrode body 2 can be enhanced by arranging the seat body reinforcing sleeve 221 and the rod body reinforcing sleeve 231 with high hardness, and conduction of protective gas cannot be influenced simultaneously, and optionally, the rod body reinforcing sleeve 231 and the seat body reinforcing sleeve 221 are made of stainless steel.

As shown in fig. 3, the electrode tip 21 is connected with the connecting seat 22 by a pin, so that the electrode tip 21 and the connecting seat 22 can be detached, the electrode tip 21 can be replaced independently when the electrode tip 21 is damaged, and meanwhile, different types of electrode tips 21 can be flexibly configured for different types and shapes of workpieces to be welded. The connecting rod 23 can be detachably arranged in the mounting hole, optionally, the connecting mode of the connecting rod 23 and the mounting seat is threaded connection, the outer wall of the connecting rod 23 is provided with external threads, and the inner wall of the mounting hole is provided with internal threads matched with the external threads. One end of the socket body reinforcing sleeve 221 is fixed in the connecting socket 22 by brazing, and the other end extends into the pressure stabilizing cavity 214 to enhance air tightness.

As shown in fig. 3, the clamping mechanism 3 includes a first clamping plate 31, a second clamping plate 32, and a locking member 33, where the first clamping plate 31 is used to clamp a first end of the conductive gasket 1, the second clamping plate 32 is used to clamp a second end of the conductive gasket 1, one side of the first clamping plate 31 is hinged to the connection seat 22, the other end is a free end, one side of the second clamping plate 32 is hinged to the connection seat 22, the other end is a free end, an axis of the second clamping plate 32 hinged to the connection seat 22 is parallel to an axis of the first clamping plate 31 hinged to the connection seat 22, and the locking member 33 is disposed at the free ends of the first clamping plate 31 and the second clamping plate 32 and is used to lock the first clamping plate 31 and the second clamping plate 32. The free ends of the first clamping plate 31 and the second clamping plate 32 share a locking member, which facilitates quick replacement of the conductive pad 1.

As shown in fig. 3, the optional mounting seat is provided with a threaded hole, the first clamping plate 31 and the second clamping plate 32 are provided with pin holes, the two pin holes are coaxially arranged, a cylindrical pin 34 is jointly arranged in a penetrating manner, the cylindrical pin 34 is mounted in the threaded hole of the mounting seat, and two ends of the threaded hole are respectively connected with a set screw in a threaded manner so as to fix the cylindrical pin 34.

As shown in fig. 3, the first clamping plate 31 includes a first clamping portion 311 for pressing the conductive pad 1 and a first locking portion 312 for locking, a plugging recess 313 is formed on the first locking portion 312, the second clamping plate 32 includes a second clamping portion 321 for pressing the conductive pad 1 and a second locking portion 322 for locking, a plugging protrusion 323 for plugging engagement with the plugging recess 313 is formed on the second locking portion 322, and when the first clamping plate 31 and the second clamping plate 32 are rotated for locking, the plugging protrusion 323 is first engaged with the plugging recess 313 to perform a preliminary positioning function so as to facilitate locking of a subsequent locking member.

As shown in fig. 3, the locking piece 33 includes an elastic body 331, a locking block, and a locking groove 332. The inner wall of the insertion groove 313 is provided with a mounting hole, the elastic body 331 is fixedly arranged in the mounting hole, and the expansion and contraction direction of the elastic body 331 is parallel to the rotation axis of the first clamping plate 31; the locking block is fixedly connected with the other coagulation body, one side of the locking block, which is far away from the elastic body 331, is a working surface, the working surface is a smooth convex spherical surface, and when the elastic body 331 is not subjected to external force, the working surface of the locking block extends out of the mounting hole; the locking groove 332 is provided on the insertion protrusion 323 for cooperation with the locking block. In the locking process, the first clamping plate 31 and the second clamping plate 32 are rotated, when the first clamping plate 31 and the second clamping plate are intersected, the spherical working surface is contacted with the surface of the first inserting protrusion 323, a component force parallel to rotation is generated, the elastic piece is compressed, the working surface continues to slide on the surface of the inserting protrusion 323, and when the working surface slides to a position where the locking block is opposite to the locking groove 332, the locking block enters the locking groove 332 under the tension of the elastic body 331, so that locking is realized; when the unlocking is needed, the first clamping plate 31 and the second clamping plate 32 are reversely rotated, the working surface is extruded by the edge of the locking groove 332, and an axial component force is generated, so that the elastic body 331 is compressed again, and when the locking block is separated from the locking groove 332, the unlocking is completed; the whole locking and unlocking process does not need to manually control the locking piece 33, and the locking and unlocking can be completed only by rotating the first clamping plate 31 and the second clamping plate 32, so that the locking and unlocking speed is high.

As shown in fig. 3 and 4, the locking members 33 are provided with at least two groups, the elastic body 331 of each group of locking members 33 is mounted on different sides of the inner wall of the inserting groove 313, the locking grooves 332 of each group of locking members 33 are formed on different sides of the inserting protrusion 323, in this embodiment, the locking members 33 are provided with two groups of locking grooves 332 formed on the inserting protrusion 323 and two positioning surfaces perpendicular to the axis of the cylindrical pin 34, two positioning surfaces perpendicular to the axis of the cylindrical pin 34 are also formed in the inserting groove 313, two positioning surfaces of the inserting protrusion 323 are respectively provided with a mounting hole for mounting the elastic member and the locking block, the two groups of locking members 33 are respectively locked on the upper side and the lower side of the inserting protrusion 323, locking is stable, and unlocking and locking of the plurality of groups of locking members 33 can be realized in the process of rotating the first clamping plate 31 and the second clamping plate 32. Alternatively, the locking element 33 can also be arranged on a surface of the plug-in projection 323 which is parallel to the axis of the cylindrical pin 34, i.e. on the end surface of the plug-in projection 323 facing away from the end of the second holding part 321.

As shown in fig. 3, fastening ribs 35 are respectively arranged at two sides of the connecting seat 22, and a first end and a second end of the conductive gasket 1 are respectively covered on the fastening ribs 35; the first clamping part 311 and the second clamping part 321 are respectively provided with a fastening groove 36 corresponding to the fastening convex edge 35, and when the first clamping plate 31 and the second clamping plate 32 are locked, the fastening convex edge 35 jacks the conductive gasket 1 into the fastening grooves 36, so that the fastening convex edge 35 and the inner wall of the fastening grooves 36 jointly clamp the conductive gasket 1. The arrangement of the fastening convex edges 35 and the fastening grooves 36 can increase the contact area between the clamping mechanism 3 and the electrode body 2 and the conductive gasket 1, so that the friction force is increased, and the clamping of the conductive gasket 1 is more stable.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. An electrode for resistance spot welding of a metal thin-walled structure, comprising:

one end of the electrode body (2) is provided with a welding plane (211), the welding plane (211) is provided with an air outlet hole (212), and a gas channel communicated with the air outlet hole (212) is formed in the electrode body (2);

the conductive gasket (1) is in a strip shape and comprises a first end and a second end, the first end and the second end are covered on the welding plane (211), and an exhaust hole communicated with the air outlet hole (212) is formed in the conductive gasket (1);

and the clamping mechanism (3) is used for clamping and fixing the first end head and the second end head of the conductive gasket (1) on the electrode body (2).

2. An electrode for resistance spot welding of a thin metal wall structure as defined in claim 1,

the electrode body (2) is provided with a transition chamfer at the edge of the welding plane (211), a side blowing hole (213) communicated with the gas channel is formed in the transition chamfer, and the air outlet direction of the side blowing hole (213) and the included angle of the welding plane (211) are acute angles.

3. Electrode for resistance spot welding of thin metal wall structure according to claim 1, characterized in that the electrode body (2) comprises

The electrode head (21), the welding plane (211) and the air outlet hole (212) are positioned on the electrode head (21);

the connecting seat (22) is detachably connected with the electrode head (21), a mounting hole communicated with the air outlet hole (212) is formed in the connecting seat (22), and the clamping mechanism (3) is arranged on the connecting seat (22);

one end of the connecting rod (23) is detachably arranged in the mounting hole, the other end of the connecting rod is connected with a protective gas source, a through hole is formed in the connecting rod (23) along the length direction, and the through hole is communicated with the mounting hole to form the gas channel;

the middle section of the conductive gasket (1) is wrapped on the surface of the electrode head (21), and the first end and the second end of the conductive gasket (1) are fixed on the surface of the connecting seat (22) through the clamping mechanism (3) respectively.

4. An electrode for resistance spot welding of a thin metal wall structure according to claim 3,

a seat body reinforcing sleeve (221) is embedded in the mounting hole;

the through hole is embedded with a rod body reinforcing sleeve (231);

the hardness of the rod body reinforcing sleeve (231) and the hardness of the seat body reinforcing sleeve (221) are both larger than those of the connecting seat (22) and the connecting rod (23), and the rod body reinforcing sleeve (231), the seat body reinforcing sleeve (221) and the air outlet hole (212) are sequentially communicated.

5. An electrode for resistance spot welding of a thin metal wall structure as defined in claim 4,

the electrode head (21) is internally provided with a pressure stabilizing cavity (214) communicated with the air outlet hole (212), and the seat body reinforcing sleeve (221) extends out of the connecting seat (22) and extends into the pressure stabilizing cavity (214).

6. An electrode for resistance spot welding of a thin metal wall structure according to claim 3, characterized in that said clamping means (3) comprise,

the first clamping plate (31) is used for clamping the first end of the conductive gasket (1), one end of the first clamping plate (31) is hinged with the connecting seat (22), and the other end of the first clamping plate (31) is a free end;

the second clamping plate (32) is used for clamping the second end of the conductive gasket (1), one end of the second clamping plate (32) is hinged with the connecting seat (22), the other end of the second clamping plate (32) is a free end, and the axis of the second clamping plate (32) hinged with the connecting seat (22) and the axis of the first clamping plate (31) hinged with the connecting seat (22) are parallel;

a locking member (33) provided at the free ends of the first clamping plate (31) and the second clamping plate (32);

by rotating the first clamping plate (31) and the second clamping plate (32) so that the free ends of the first clamping plate (31) and the second clamping plate (32) are brought closer to or farther from each other, and when the free ends meet, the first clamping plate (31) and the second clamping plate (32) are locked by the locking member (33).

7. An electrode for resistance spot welding of thin metal wall structure according to claim 6, characterized in that said locking member (33) comprises

An elastic body (331) fixed on the first clamping plate (31), wherein the expansion and contraction direction of the elastic body (331) is parallel to the rotation axis of the first clamping plate (31);

the locking block is connected with the elastic body (331), one side of the locking block, which is far away from the elastic body (331), is a working surface, and the working surface is a smooth convex spherical surface;

a locking groove (332) located on the second clamping plate (32) and used for being matched with the locking block;

the working surfaces of the locking blocks are extruded by the surfaces of the second clamping plates (32) through the rotation intersection of the first clamping plates (31) and the second clamping plates (32), the elastic bodies (331) are compressed, and when the locking blocks move to a position opposite to the locking grooves (332), the working surfaces of the locking blocks enter the locking grooves (332) under the action of the tension of the elastic bodies (331), so that the locking of the first clamping plates (31) and the second clamping plates (32) is realized.

8. An electrode for resistance spot welding of a thin metal wall structure as defined in claim 7,

the first clamping plate (31) comprises a first clamping part (311) for pressing the conductive gasket (1) and a first locking part (312) for locking, wherein an inserting groove (313) is formed on the first locking part (312), and a mounting hole for accommodating the elastic body (331) is formed in the inserting groove (313);

the second clamping plate (32) comprises a second clamping part (321) for pressing the conductive gasket (1) and a second locking part (322) for locking, a plug-in protrusion (323) for plug-in matching with the plug-in groove (313) is formed on the second locking part (322), and the locking groove (332) is positioned on the plug-in protrusion (323).

9. An electrode for resistance spot welding of a thin metal wall structure as defined in claim 8,

the locking pieces (33) are provided with at least two groups, the elastic body (331) of each group of the locking pieces (33) is arranged on different sides of the inner wall of the inserting groove (313), and the locking grooves (332) of each group of the locking pieces (33) are arranged on different sides of the inserting protrusion (323).

10. An electrode for resistance spot welding of a thin metal wall structure as defined in claim 8,

fastening ribs (35) are respectively arranged on two sides of the electrode body (2), and a first end and a second end of the conductive gasket (1) are respectively covered on the fastening ribs (35);

fastening grooves (36) corresponding to the fastening convex edges (35) are formed on the first clamping part (311) and the second clamping part (321),

when the first clamping plate (31) and the second clamping plate (32) are locked, the fastening protruding edges (35) jack the conductive gasket (1) into the fastening grooves (36), so that the conductive gasket (1) is clamped by the fastening protruding edges (35) and the inner walls of the fastening grooves (36).