CN106181021A - A kind of electric current auxiliary friction post/tapered plug welding method and frock thereof - Google Patents

Abstract

The invention discloses a current-assisted friction column/cone plug welding method. The steps are as follows: according to the technological requirements of friction plug welding, a cylindrical or truncated cone-shaped plug rod is used to prefabricate a plug hole in the area of a workpiece to be welded; Clamp the stopper rod and the workpiece, the plug hole and the stopper rod remain coaxial; start the welding machine and auxiliary power supply, apply axial force while the stopper rod rotates, and form a conductive circuit between the auxiliary power supply, stopper rod, workpiece and conductive block, The material at the end of the stopper quickly reaches a thermoplastic state under the action of frictional heat and resistance heat. At the same time, under the action of thermomechanical coupling, the plastic material transfers to the surroundings to fill the gap. As the welding process progresses, the gap is filled. When the top After the forging is completed, turn off the auxiliary power supply and the welding machine, so far the current-assisted friction column/taper plug welding is completed. The invention can reduce the requirement on frictional heat, thereby lowering the requirement on the power system of welding equipment; can improve the microstructure and mechanical properties of the plug weld; and can widen the welding process window.

Description

A current-assisted friction column/taper plug welding method and its tooling

technical field

The invention belongs to the technical field of solid-phase friction welding, and in particular relates to a novel friction column/cone plug welding method using a composite heat source of electric current and solid-phase friction.

Background technique

Friction column/plug welding is a new type of solid-phase joining technology based on the welding process of continuous drive friction welding and stud welding. It was invented and patented by the British Welding Institute in 1992. The basic principle is: prefabricate a plug hole to be welded on the base metal, keep the consumable plug rod material with a diameter smaller than the plug hole concentric with the plug hole, and rotate at a high speed, while exerting a certain axial pressure on the plug rod and The bottom of the plug hole moves, and when the rotating stopper rod comes into contact with the bottom of the plug hole, the heat generation process of frictional shearing begins. Under the joint action of thermal-mechanical coupling, the consumable stopper rod on the friction interface is in a thermoplastic state, and at the same time transfers to the surroundings to fill the radial gap between the stopper rod and the inner wall of the plug hole, and the plastic layer is formed due to the heat dissipation and cooling deposition of the base metal Dynamically recrystallized deposited layers. During the whole welding process, the production rate of the plastic layer is higher than the feed rate of the stopper rod, so the friction surface will continue to rise along the stopper rod, and the plug hole will be continuously filled by the dynamic recrystallization deposition layer, and finally achieve a tight bond with the base metal. According to the different geometric shapes of the plug hole and the stopper rod, it can be divided into two types, namely friction cylinder plug welding (Friction HydroPillar Processing, FHPP) and friction cone plug welding (Friction Taper Plug Welding, FTPW). Friction Stitch/Plug Seam Welding (FSW) is formed by overlapping multiple Friction Stitch/Plug Welds side by side, which can be used to repair long-sized defects.

Friction column/plug welding has the following advantages: (1) a "green" welding method, no smoke and dust splash, no arc light and radiation; (2) solid-state connection, thermal deformation and residual stress are small, effectively avoiding hydrogen-induced cracks Welding defects such as pores and inclusions can realize underwater welding; (3) The manufacturing cost of plug welds is low, and no flux and shielding gas are required; (4) All-position welding can be performed, remote control is possible, automation is easy, and welding efficiency is high , Welded joints are highly repeatable. Therefore, friction column/plug welding has attracted extensive attention in the industrial field, especially in some special applications such as the field of ocean engineering, which has outstanding advantages.

First of all, the friction column/cone weld can be used to repair various welding defects caused by the fusion welding process, and its repair effect is better than that of the original fusion welding repair. Concave holes and local defects of various friction stir welds can also be used to repair welding joint defects of space shuttle external tanks, various local corrosion defects of marine propellers and oil and gas storage tanks; secondly, when the stopper rod becomes a bolt, it is friction Stud welding, which can be used for stud welding of sacrificial anodes of subsea risers and floating production storage vessels; finally, friction column/cone welding technology can be used for welding and partial repair of underwater steel structures, nuclear industry The emergency partial repair of the surface of the boiling water reactor and the high-pressure steam pipeline can also be used for the friction surfacing modification of the inner and outer surfaces of the parts.

There are some problems in the application process of traditional friction column/cone plug welding: (1) high requirements on welding equipment, high welding speed and large axial pressure are required, resulting in a narrow range of welding process adjustment; (2) At the beginning of welding, due to the excessive load, the welding torque rises rapidly, which may easily cause the welding machine to be stuck due to overload; (3) the flow of plastic material at the fillet transition at the bottom of the plug weld is not sufficient, and due to insufficient frictional heat source, it is easy to cause unwelded (4) Due to the short duration of the welding process and the fast welding cooling rate, a coarse structure may be formed inside the entire plug weld, resulting in an increase in hardness and a decrease in plasticity, which has an adverse effect on the mechanical properties and plastic deformation of the plug weld .

Contents of the invention

Aiming at the prior art, the present invention provides a current-assisted friction column/taper plug welding method, adopting the unique tooling of the present invention, when an auxiliary power supply is connected, the auxiliary power supply, the upper conductive block, the stopper rod, the workpiece and the lower conductive A conductive circuit is formed between the blocks; a large current is applied between the stopper rod and the workpiece, so that the friction interface of the stopper rod forms a plug weld under the joint action of the friction heat source and the contact resistance heat source, thereby realizing the current-assisted friction column/cone plug welding process .

In order to solve the above technical problems, the present invention proposes a tooling for current-assisted friction plug welding, which includes a stopper clamp, a workpiece clamp and an auxiliary power supply, the stopper clamp includes a metal sleeve, and the opening of the metal sleeve Downward, the top of the metal sleeve is provided with a cylindrical rod that matches the main shaft sleeve of the welding machine and the welding chuck, and a hard rubber bushing is provided along the inner wall of the metal sleeve, and a hard rubber bushing is provided inside the hard rubber bushing. There is a stopper chuck, and the stopper chuck is composed of a metal jacket and a spring chuck; an upper conductive block is arranged between the top of the metal jacket and the top of the hard rubber bushing, along the metal The axial center of the sleeve and the hard rubber bushing is provided with a first through hole; the upper end of the through hole communicates with the central hole of the main shaft sleeve of the welding machine; the workpiece fixture includes a workpiece box of insulating material and a fixing fixture , the bottom plate of the workpiece box is provided with a lower conductive block; the side wall of the workpiece box is provided with a second through hole; the positive electrode and the negative electrode of the auxiliary power supply are respectively drawn with a first cable and a second Two cables, the first cable is connected to the upper conductive block through the inner hole of the main shaft sleeve of the welding machine, the inner hole of the welding chuck and the first through hole in turn; the second cable is connected to the upper conductive block through the second through hole to the lower conductive block; after the stopper clamp clamps the stopper rod and the workpiece fixture clamps the workpiece, when the auxiliary power supply is turned on, from the first cable, through the upper conductive block, stopper, workpiece, and lower conductive block to the The second cable forms a loop.

Further speaking, the areas of the upper conductive block and the lower conductive block are larger than the horizontal projected area of the plug hole on the workpiece.

According to the technical requirements of friction plug welding, the auxiliary power supply is selected from one of AC arc welding power supply, DC arc welding power supply, inverter arc welding power supply and pulse arc welding power supply.

Utilizing the above-mentioned tooling for current-assisted friction plug welding of the present invention to realize the current-assisted friction column/taper plug welding method includes the following steps:

Step 1. According to the technical requirements of friction plug welding, use the same or different material as the workpiece to process the plug rod with a cylindrical or truncated cone shape at the bottom, prefabricate the plug hole matching the plug rod in the area to be welded of the workpiece, and place the plug Clean rods and plug holes;

Step 2, using the tooling for current-assisted friction plug welding according to claim 1 to clamp the stopper rod and the workpiece on the welding machine, wherein the area of the upper conductive block is larger than the area between the upper conductive block and the stopper rod Contact area; the area of the lower conductive block is greater than the contact area between the stopper rod and the plug hole on the workpiece; the lower conductive block is located between the workpiece and the upper surface of the workpiece box; the axis of the plug hole on the workpiece is in line with the The axes of the stopper rods coincide;

Step 3, one end of the first cable passes through the inner hole of the main shaft sleeve of the welding machine, the inner hole of the welding chuck and the first through hole, and then connects with the upper conductive block; one end of the second cable passes through the workpiece box The second through hole on the side wall is connected to the lower conductive block at the bottom of the workpiece; the other ends of the first cable and the second cable are connected to the auxiliary power supply, and the auxiliary power supply selects AC arc according to the process requirements of friction plug welding. One of welding power supply, DC arc welding power supply, inverter arc welding power supply and pulse arc welding power supply, that is, according to the requirements of friction plug welding process, choose a power supply with appropriate current properties and current magnitude;

Step 4. Set the process parameters on the welding machine and auxiliary power supply, start the welding machine and auxiliary power supply, and after the speed of the stopper rod reaches the preset value, apply an axial force on the stopper rod, and at the same time, the stopper rod moves toward the plug along the axial direction. The direction of the bottom of the hole moves; when the stopper rod is in contact with the bottom of the plug hole, a conductive loop is formed between the auxiliary power supply, the upper conductive block, the stopper rod, the workpiece, and the lower conductive block; the friction interface between the stopper rod and the plug hole of the workpiece Due to the joint action of resistance heat and frictional heat, the material at the end of the stopper rod is quickly in a thermoplastic state. As the process progresses, the gap is filled. When the upsetting stage is completed, the auxiliary power supply and welding machine are turned off, and the current-assisted friction column/taper plug welding is completed so far.

Compared with prior art, the beneficial effect of the present invention is:

(1) The present invention is a simple and effective current-assisted method, which can ensure stable and reliable resistance heat generation. Under the auxiliary function of resistance heat, the technical requirements of friction column/cone plug welding are reduced, and the power requirements of welding equipment are reduced.

(2) The present invention can not only carry out auxiliary heating for friction column/plug welding, but also carry out preheating before welding and heat treatment after welding. Therefore, the generation of welding defects can be reduced, especially defects such as unfilled, unwelded, etc. caused by insufficient plastic flow state of the material due to insufficient heat. Thus, the welding quality is further improved, and the mechanical properties of the welded joint are improved.

(3) The additional equipment is simple and low in cost, which is conducive to the promotion and application of the current-assisted friction column/taper plug welding method, and has broad development prospects.

Description of drawings

Figure 1 is a schematic diagram of current-assisted friction plunger welding using a cylindrical stopper;

Fig. 2 is a schematic diagram of current-assisted friction plunger welding using a frustum-shaped stopper rod.

In the picture:

1-welding machine main shaft sleeve, 2-welding machine chuck, 31-upper conductive block, 32-lower conductive block, 4-metal sleeve, 41-cylindrical rod, 5-hard rubber bushing, 6-metal jacket, 7-collet collet, 8-stopper, 9-fixing fixture, 10-workpiece, 11-workpiece box, 12-workbench, 131-first cable, 132-second cable, 14-auxiliary power supply, 15 - Plug hole, arrow Ⅰ indicates the direction of axial pressure, and arrow Ⅱ indicates the direction of rotation of the stopper rod.

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

The design concept of the present invention is to pass current into the welding zone of the workpiece and generate resistance heat at the friction interface where the stopper rod contacts the plug hole of the workpiece, and the resistance heat and friction heat form a composite heat source in the friction column/cone plug welding process, Thus, the current-assisted friction column/taper plug welding process is realized. The main measures to realize resistance heat generation are: connect one electrode of the auxiliary power supply to the upper conductive block in contact with the stopper through a cable, and connect the other electrode of the auxiliary power supply to the lower conductive block connected to the welding workpiece through a cable , and insulate between the stopper rod, the main shaft sleeve of the welding machine and the welding machine chuck, and between the workpiece and the workbench, and form a conductive circuit between the auxiliary power supply, the stopper rod and the workpiece, so that the plug hole between the stopper rod and the workpiece Resistance heat is generated at the friction contact surface. In addition, in order to ensure that the maximum effect of the current acts on the plug weld area, the upper and lower conductive blocks are respectively designed between the center of the metal jacket above the stopper rod and the insulating bushing and the back of the workpiece at the bottom of the plug hole (that is, the upper surface of the workpiece box) ), and the area of the conductive block is designed to be larger than the projected area of the plug weld, so that the current can flow through the plug weld area to the maximum extent, rather than short-circuit transition to the surface area of the workpiece.

As shown in FIG. 1 and FIG. 2 , a tooling for current-assisted friction plug welding proposed in the present invention includes a stopper clamp, a workpiece clamp and an auxiliary power source 14 .

The stopper rod clamp includes a metal sleeve 4, the opening of the metal sleeve 4 faces downward, and the top of the metal sleeve 4 is provided with a cylindrical rod 41 that is matched with the welding machine main shaft sleeve 1 and the welding machine chuck 2, A hard rubber bushing 5 is provided along the inner wall of the metal sleeve 4, and a stopper chuck is arranged inside the hard rubber bushing 5, and the stopper chuck is composed of a metal jacket 6 and a collet 7; The stopper rod clamp is composed of three layers. From the outer layer to the inner layer, the high-strength metal sleeve 4-hard rubber bushing 5-high-strength metal jacket 6 are respectively nested by mechanical force. And between the top of the metal jacket 6 and the top of the hard rubber bushing 5, an upper conductive block 31 is provided, and a second block is arranged along the axial center of the metal sleeve 4 and the hard rubber bushing 5. A through hole; the upper end of the through hole communicates with the central hole of the welding machine main shaft sleeve 1 and cooperates with the welding machine chuck 2 to form an independent stopper rod clamping mechanism, which can not only ensure the strength, but also be connected with the welding machine main shaft The sleeve and welding machine chuck are insulated, and it is fixed on the main shaft sleeve of the welding machine to realize current-assisted welding.

Described workpiece fixture comprises the workpiece box 11 of insulating material and fixing fixture 9, and the bottom plate of described workpiece box 11 is provided with lower conductive block 32, and the area of described upper conductive block 31 and lower conductive block 32 is all greater than the plug on workpiece 10. The horizontal projected area of the hole allows the current to flow through the plug weld area to the maximum extent, rather than short-circuiting and transitioning to the surface area of the workpiece. The side wall of the tool box 11 is provided with a second through hole. The used insulating working box 11 (groove) and insulating fixing fixture 9 must have certain mechanical properties and thermal stability, and ensure complete insulation. Therefore, the insulated working box 11 can adopt a sandwich structure, that is, it is composed of high-strength metal-hard rubber-high-strength metal nested with each other. The fixing fixture 9 can be made of hard rubber and high-strength metal, and the workpiece 10 can be fixed by bolt connection, so that the workpiece 10 is insulated from the workbench 12 during the whole welding process.

In the present invention, the upper and lower conductive blocks 31 and 32 used will have good electrical conductivity, and circular copper materials can be selected, and matched with the projection surface of the plug weld, with the workpiece and the plug used to clamp the plug rod. Good contact should be maintained between the metal jackets. At the same time, in order to reduce the current escaping to the non-welding area, the areas of the upper and lower conductive blocks 31 and 32 only need to be slightly larger than the projected area of the plug hole.

According to the technical requirements of friction plug welding, the auxiliary power supply is selected from one of AC arc welding power supply, DC arc welding power supply, inverter arc welding power supply and pulse arc welding power supply, so as to provide a relatively large current. A first cable 131 and a second cable 132 are respectively drawn from the positive electrode and the negative electrode of the auxiliary power supply 14, and the first cable 131 passes through the inner hole of the main shaft sleeve 1 of the welding machine and the chuck 2 of the welding machine in turn. The inner hole and the first through hole are connected to the upper conductive block 31; the second cable 132 is connected to the lower conductive block 32 through the second through hole; the stopper clamp clamps the stopper rod 8 and the work clamp clamps the workpiece 10 Afterwards, when the auxiliary power supply 14 is turned on, a loop is formed from the first cable 131, through the upper conductive block 31, the stopper 8, the workpiece 10, and the lower conductive block 32 to the second cable 132.

In the present invention, the apertures of the first through hole and the second through hole used to pass through the cable are all round holes that match the diameter of the cable to pass through, and the first cable 131 passes through the round hole and is arranged on the stopper clamp The metal jacket 6 in the middle is connected to the upper conductive block 31 at the center between the insulating bushings 5, and the second cable 132 is connected to the lower conductive block 32 on the back of the workpiece 10 below the plug hole 15, which can avoid high-speed rotation and cause the cable Tangle problem.

Using the above tooling for current-assisted friction plug welding, the current-assisted friction column/cone plug welding method can be easily realized, which mainly includes the following steps:

Step 1. According to the technical requirements of friction plug welding, use the same or different material as the workpiece to process the stopper rod 8 with a cylindrical or truncated cone shape at the bottom, and prefabricate the plug hole matching the stopper rod 8 in the area to be welded of the workpiece 10 15. Clean the stopper rod 8 and the plug hole 15;

Step 2, using the tooling for current-assisted friction plug welding as claimed in claim 1 to clamp the stopper rod 8 and the workpiece 10 on the welding machine, wherein the areas of the upper conductive block 31 and the lower conductive block 32 are larger than the workpiece 10 The horizontal projection area of the upper plug hole; the lower conductive block 32 is located between the upper surface of the workpiece 10 and the workpiece box 11; the axis of the plug hole 15 on the workpiece 10 coincides with the axis of the stopper rod 8;

Step 3, one end of the first cable 131 is connected to the upper conductive block 31 after passing through the inner hole of the welding machine main shaft sleeve 1, the inner hole of the welding chuck 2 and the first through hole; the second cable 132 One end passes through the second through hole on the side wall of the workpiece box 11 and is connected to the lower conductive block 32 at the bottom of the workpiece 10; the other end of the first cable 131 and the second cable 132 are connected to the auxiliary power supply 14, and the auxiliary power supply According to the technical requirements of friction plug welding, choose one of AC arc welding power supply, DC arc welding power supply, inverter arc welding power supply and pulse arc welding power supply.

Step 4. After the clamping and fixing is completed, set the process parameters on the welding machine and the auxiliary power supply 14, start the welding machine and the auxiliary power supply, and make the stopper rod 8 rotate at a high speed. Axial force is applied on the rod 8, and at the same time, the stopper rod 8 moves axially toward the bottom of the plug hole 15; A conductive loop is formed between the workpiece 10 and the lower conductive block 32; according to the principle of maximum contact resistance, the resistance at the stopper rod 8 and the friction interface is the largest, generating a large amount of resistance heat. At the friction interface between the stopper rod 8 and the plug hole 15 of the workpiece 10, due to the joint action of resistance heat and friction heat, the material at the end of the stopper rod 8 is quickly in a thermoplastic state, and at the same time, under the joint action of thermomechanical coupling, the plastic material moves toward the Transfer around to fill the gap between the stopper rod 8 and the plug hole 15, and form a dynamic recrystallization deposition layer due to the heat dissipation and cooling deposition of the base material. As the welding process proceeds, the gap is continuously filled. After the upsetting stage is completed, the auxiliary power supply 14 should be turned off immediately, and then the welding machine should be stopped, so far the current-assisted friction column/plug welding is completed. The stopper rod 8 is unloaded from the stopper rod clamp, the clamp is unloaded, the workpiece clamp is removed, and the redundant stopper rod material on the workpiece is processed, the whole processing process can be completed.

Compared with the traditional friction column/cone welding process, this method has the following obvious features: (1) It can reduce the requirements for frictional heat, thereby reducing the requirements for the power system of welding equipment and equipment manufacturing costs; (2) It can improve the welding seam Insufficient frictional heat source at the bottom is likely to cause unfavorable factors of defects, thereby improving the microstructure and mechanical properties of plug welds; (3) It can widen the welding process window of ferrous metals, superalloys and other materials.

With reference to Fig. 1, the welding method of the present invention will be described below by taking current-assisted friction plunger welding of 35 mm thick X65 pipeline steel as an example.

First, a cylindrical plug hole with a diameter of 11mm and a height of 20mm is prefabricated at the position of the workpiece 10 to be welded, and then the surface oil, abrasive grains and debris are cleaned. A cylindrical X65 stopper rod 8 with a diameter of 10mm is used to match it. The upper and lower conductive blocks 31 and 32 are made of disc-shaped copper material, the auxiliary power supply 14 is an IGBT arc welding rectifier, the upper conductive block 31 is connected with the auxiliary power supply 14 with the first cable 131, and the lower conductive Block 32 is connected. As shown in FIG. 1, the stopper rod clamp and workpiece clamp are installed in place, and the stopper rod 8 and the workpiece 10 are clamped and assembled.

After the clamping and assembly are completed, the stopper rod 8 is kept coaxial with the plug hole 15, and various relevant parameters are set on the friction plunger welding machine and the auxiliary power supply 14. Wherein, it is assumed that the rotational speed of the stopper rod 8 is 5000-7500rmp, the axial pressure is 20-40KN, and the auxiliary current is 300-700A. The parameters set in this embodiment are: stopper rotation speed 6500rmp, axial pressure 30KN, auxiliary current 400A. Start the friction plunger welding machine and the auxiliary power supply 14 to make the stopper rod 8 rotate at a high speed. After the rotating speed reaches 6500rmp, apply 30KN axial pressure on the stopper rod 8 (as shown by the downward arrow I in Figure 1), so that it Move along the axial direction of the plug hole 15 toward the bottom of the plug hole.

When the stopper rod 8 was in contact with the bottom of the plug hole 15, through the connection of the first and second cables 131 and 132, the plug hole 15 of the auxiliary power supply 14, the stopper rod 8, the workpiece 10 and the upper and lower conductive blocks 31 and 32 A conductive loop is formed between them. According to the principle of maximum contact resistance, the resistance at the stopper rod 8 and the friction interface is the largest, generating a large amount of resistance heat, which not only provides auxiliary heating for friction plunger welding, but also performs pre-weld preheating and post-weld heat treatment. Under the combined action of resistance heat and friction heat, the material at the end of the stopper rod is rapidly in a thermoplastic state. At the same time, under the joint action of thermomechanical coupling, the plastic material transfers to the surroundings to fill the gap between the plug rod and the plug hole, and forms a dynamic recrystallization deposition layer due to the heat dissipation and cooling deposition of the base metal. As the welding process proceeds, the plug hole is continuously filled. When the upsetting stage is completed, the auxiliary power supply is immediately turned off, and then the friction plunger welding machine is stopped, thereby realizing current-assisted friction plunger welding.

The stopper rod 8 is unloaded from the stopper rod clamp, and the stopper rod and the workpiece fixture are removed, the accessories are removed, and the redundant stopper rod 8 material on the workpiece 10 is processed, and the whole processing process can be completed. It has been tested that the current-assisted friction plunger welding method of the present invention can obtain welded joints with good shape and excellent mechanical properties by adopting relatively small welding rotation speed and axial pressure.

The application examples described above are not limited to the X65 pipeline steel material, and can also be applied to other types of materials for current-assisted friction plunger welding.

The principle of the current-assisted friction cone welding method for the frustum-shaped stopper hole shown in FIG. 2 is exactly the same as the current-assisted friction plunger welding method for the cylindrical stopper hole shown in FIG. 1 . Therefore, no detailed description will be given.

Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the present invention, many modifications can be made without departing from the gist of the present invention, and these all belong to the protection of the present invention.

Claims (4)

1., for a frock for electric current auxiliary friction plug welding, including stopper fixture, work piece holder and accessory power supply (14), it is special Levy and be:

Described stopper fixture includes metal sleeve (4), described metal sleeve (4) opening down, the top of described metal sleeve (4) Portion is provided with the cylindrical rod (41) coordinated with welding machine collar bush (1) and welding machine chuck (2), and the inwall along described metal sleeve (4) sets Having ebonite bush (5), be provided with stopper chuck in described ebonite bush (5), described stopper chuck is by metal chuck (6) and bullet Spring chuck (7) is constituted；It is provided with conducting block between top and the top of described ebonite bush (5) of described metal chuck (6) (31), the axial center along described metal sleeve (4) and ebonite bush (5) is provided with the first through hole；Described first through hole Upper end connects with the centre bore of described welding machine collar bush (1)；

Described work piece holder includes workpiece box (11) and the stationary fixture (9) of insulant, on the base plate of described workpiece box (11) Face is provided with lower conducting block (32)；The sidewall of described workpiece box (11) is provided with the second through hole；

The first cable (131) and the second cable is led to respectively on the anelectrode and negative electrode of described accessory power supply (14) (132), described first cable (131) sequentially passes through welding machine collar bush (1) endoporus, the endoporus of welding machine chuck (2) and described One through hole is connected to conducting block (31)；Described second cable (132) is connected to lower conducting block (32) by the second through hole；Plug After rod clamp clamping stopper (8) and work piece holder clamping workpiece (10), when connecting accessory power supply (14), from described first cable (131), successively through upper conducting block (31), stopper (8), workpiece (10), lower conducting block (32) to described second cable (132) shape Become primary Ioops.

The most according to claim 1 for the frock of electric current auxiliary friction plug welding, it is characterised in that described upper conducting block (31) With the horizontal projected area that the area of lower conducting block (32) is all higher than the upper consent (15) of workpiece (10).

The most according to claim 1 for the frock of electric current auxiliary friction plug welding, it is characterised in that described accessory power supply is to hand over One in stream Arc Welding Power, electricity source for dc arc welding, inverter arc welding power source and pulsed arc-welding power source.

4. electric current auxiliary friction post/tapered plug welding method, it is characterised in that comprise the following steps:

Step one, according to the technological requirement of friction plug weld, uses or foreign material of the same race with workpiece process bottom be cylindric Or the stopper (8) of frustum, the prefabricated consent (15) coordinated with stopper (8) in the region to be welded of workpiece (10), by stopper (8) clean up with consent (15)；

Step 2, utilize as claimed in claim 1 for the frock of electric current auxiliary friction plug welding on welding machine clamping stopper (8) and Workpiece (10), wherein, the area of described upper conducting block (31) and lower conducting block (32) is all higher than the upper consent (15) of workpiece (10) Horizontal projected area；Described lower conducting block (32) is positioned between the upper surface of workpiece (10) and workpiece box (11)；Described workpiece (10) axis of the consent (15) on and the dead in line of described stopper (8)；

Step 3, one end of the first cable (131) pass the endoporus of welding machine collar bush (1), the endoporus of welding machine chuck (2) and institute It is connected with upper conducting block (31) after stating the first through hole；One end of second cable (132) is through the second of workpiece box (11) sidewall It is connected with the lower conducting block (32) being positioned at workpiece (10) bottom after through hole；First cable (131) and the second cable (132) The other end is connected to accessory power supply (14), described accessory power supply according to the technological requirement of friction plug weld, select AC arc welding power source, One in electricity source for dc arc welding, inverter arc welding power source and pulsed arc-welding power source；

Step 4, on welding machine and accessory power supply (14), set technological parameter, start welding machine and accessory power supply, treat that stopper (8) turns After speed reaches preset value, applying axial force on stopper (8), meanwhile, stopper (8) moves to consent (15) bottom direction vertically Dynamic；When stopper (8) contacts with consent (15) bottom, at accessory power supply (14), upper conducting block (31), stopper (8), workpiece (10), galvanic circle is formed between lower conducting block (32)；Frictional interface between the consent (15) of stopper (8) and workpiece (10) Place's resistance heat acts on the common of frictional heat, and the end material of stopper (8) is in rapidly hot plastic state, meanwhile, in thermo-mechanical Coupled Amounting under same-action, plastic material fills the gap between stopper (8) and consent (15), along with welding process to surrounding transfer Carrying out, this gap is filled, and after the upset stage completes, closes accessory power supply (14) and welding machine, so far completes electric current auxiliary Help friction column/tapered plug welding.