A Friction Stir Welding Method Based on Double-pass Offset Welding

A welding method and friction stir technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as limited application range and shape limitation of repair welding materials, and achieve the effect of increasing the elongation rate of the joint and improving the elongation rate

Active Publication Date: 2017-11-24
SICHUAN AEROSPACE LONG MARCH EQUIP MFG CO LTD
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Problems solved by technology

Although this type of method eliminates the disadvantages caused by the fusion welding filling method, it is limited by the shape of the repair welding material, and its application range is limited

Method used

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  • A Friction Stir Welding Method Based on Double-pass Offset Welding
  • A Friction Stir Welding Method Based on Double-pass Offset Welding

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Embodiment

[0027] see figure 1 and 2 , a friction stir welding method based on double-pass offset welding, the steps are as follows: according to the material properties and geometric characteristics to be welded, select the appropriate stirring needle and welding process parameters, the selected stirring needle is as follows figure 1 As shown, there is a stirring needle tip 1 and a stirring needle shoulder 2, and the width of the material missing area is set to 2p, and repair welding is carried out in two steps: the first step is symmetrical to the center of the material missing area, and the welding track is moved to one side Row offset, the distance is p, so that after the offset, the symmetrical center line is located on the retreating side of the welding track, and welding is performed; the second step is to offset the welding track to the other side of the symmetric line, and the offset distance is also p, The center line of symmetry after the offset is located on the advancing si...

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Abstract

The invention discloses a stirring friction welding method based on double-way offset welding, and belongs to the technical field of stirring friction welding. The method comprises the steps that preweld cleaning is carried out on an area to be welded; a symmetric center line of the area to be welded is determined according to the shape characteristic of the area to be welded, the welding track is offset towards one side, and then welding is carried out; and the welding track is offset towards the other side of the symmetric center line, and then welding is carried out. According to the method, the situation that in a traditional repair welding method, due to the difference of material filling and a material filling method, the strength of a repair welding connector is weakened is avoided. Meanwhile, special welding tools and special welding technologies are not needed in the welding method, the original position repair welding can be implemented on any welding line, the repair welding connector with the strength equal to the tensile strength of an original welding line can be obtained after repair welding, and the strength coefficient of the connector is larger than or equal to 0.6. Meanwhile, the ductility of the repair welding connector is obviously improved compared with a welding line obtained before repair welding, and the ductility of the connector can be increased by 20%-30%.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a friction stir welding method based on double-pass offset 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 aluminum alloy structural parts in the fields of aerospace, automobiles, ships, and rail vehicles. However, in the process of engineering application, the occurrence of w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/12B23K20/24
Inventor 石璟邹敏裴利成王刚王爽王博陈明杏
Owner SICHUAN AEROSPACE LONG MARCH EQUIP MFG CO LTD
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