No-accessory constant-strength repair welding method based on pumpback type friction stir welding

A friction stir welding, no auxiliary material technology, used in welding equipment, non-electric welding equipment, metal processing equipment and other directions, can solve the problems of randomness in the location and size of defects, weakened resistance to damage of welds, and rising repair welding costs. , to achieve the effect of controllable length, smooth and beautiful surface, and convenient operation.

Inactive Publication Date: 2019-12-10
SICHUAN AEROSPACE LONG MARCH EQUIP MFG CO LTD
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AI Technical Summary

Problems solved by technology

Due to the formation of flashes during the welding process, the weld seam will become thinner, which will weaken the anti-damage ability of the weld seam to a certain extent.
On the other hand, there is randomness in the position and size of the defects in the weld, and there may not be defects in the entire weld
However, using the above repair welding method, in order to avoid the influence of the "keyhole" on the weld, the repair welding process needs to re-weld the entire weld from the beginning to the end; when the length of the weld is long, but the defect only appears in a small In the local area, this method will cause a substantial increase in the cost of repair welding

Method used

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  • No-accessory constant-strength repair welding method based on pumpback type friction stir welding
  • No-accessory constant-strength repair welding method based on pumpback type friction stir welding
  • No-accessory constant-strength repair welding method based on pumpback type friction stir welding

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Embodiment 1

[0033]According to the material properties and geometric characteristics of the welding, select the appropriate stirring head and welding process parameters. Assuming that the width of the missing material area is 2p, repair welding is carried out in two steps. In the first step, take the center of the missing material area as the symmetry line ( image 3 ), offset the welding trajectory to one side with a distance of p, so that the central symmetry line after the offset is located on the receding side of the welding trajectory ( image 3 ), for welding. After the stirring head moves out of the existing area and completes the repair welding, continue to move forward, and at the same time withdraw the stirring needle into the shoulder at a certain speed, and finally obtain a weld without "keyhole"; the second step is to move the welding track to the symmetrical The other side of the line is offset, and the offset distance is also p, so that the center symmetric line after off...

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Abstract

The invention relates to a no-accessory constant-strength repair welding method based on pumpback type friction stir welding. The method includes the steps of firstly, selecting a proper ordinary stirring head and friction stir welding process parameters; secondly, making a preparation for implementing repair welding; thirdly, determining the welding trajectory; fourthly, offsetting the welding trajectory to one side line for welding; fifthly, offsetting the welding trajectory to the other side line of the symmetric line for welding; and sixthly, polishing a welding joint. No additional materials need to be added and no specific repair welding tools are needed in the repair welding process of the method, and the method is suitable for repair welding under various conditions and is convenient to operate. No key joints exist in the surface of the welding joint formed after repair welding, the strength of the joint is equivalent to the strength of an original welding joint, and the constant-strength repair welding can be realized.

Description

technical field [0001] The present invention relates to a friction stir welding method, in particular to a welding method using retraction friction stir welding technology, in particular to a welding method using zero-inclination friction stir welding technology to realize defects such as missing weld materials Methods of strength repair welding. Background technique [0002] Friction stir welding technology is a solid-phase joining technology born in the UK Welding Technology Institute (TWI) in the 1990s. Its welding process has no arc, smoke, gas protection and metal filling. It is a typical new green welding technology. Compared with the traditional fusion welding method, the weld has the advantages of high joint strength, not easy to produce defects such as thermal cracks and pores, small welding deformation, and low residual stress. In particular, the unique advantages of this technology in welding aluminum alloys have made it widely used in the manufacture of various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
CPCB23K20/123
Inventor 石璟刘永坡贺飞飞李光耀贺达龙林刚邹敏马丁
Owner SICHUAN AEROSPACE LONG MARCH EQUIP MFG CO LTD
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