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Method for improving welding efficiency of backfill type friction stir spot welding

A friction stir, spot welding technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as unfavorable industrial production, long welding time, and low welding efficiency.

Pending Publication Date: 2021-09-10
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of long welding time and low welding efficiency in the prior art, which are not conducive to industrial production, and provide a method for improving the welding efficiency of backfill friction stir spot welding, so as to shorten the formation of backfill friction stir spot welding. time for a good welded joint

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  • Method for improving welding efficiency of backfill type friction stir spot welding
  • Method for improving welding efficiency of backfill type friction stir spot welding
  • Method for improving welding efficiency of backfill type friction stir spot welding

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Embodiment 1

[0029] The present invention provides a new method for improving the welding efficiency of backfill friction stir spot welding. The backfill friction stir spot welding tool is used to weld two aluminum alloy plates. The welding material used in this embodiment is 0.9mm thick 6022 -T4 aluminum alloy (upper plate) and 2.0mm thick 7075-T6 aluminum alloy (lower plate), the sample size of the upper and lower plates is 100mm×25mm; the spot welding tool consists of three parts: a compression ring, a sleeve and a stirring needle. Its diameter is 15mm, 9mm and 6mm respectively, the method is as follows figure 1 shown, including the following steps:

[0030] Before welding, use acetone to remove oil and other impurities on the surface of the workpiece. Such as figure 2 As shown, a sleeve with a threaded outer wall and a grooved bottom is used. Under the condition that the pressing and withdrawing time of the welding stirring head remains unchanged, the welding efficiency is improved...

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Abstract

The invention provides a method for improving the welding efficiency of backfill type friction stir spot welding. The problems of long welding time, low welding efficiency and unfavorable industrial production in the prior art are solved. According to the method, the pressing speed of a sleeve in the pressing stage of the sleeve is improved in the welding process of traditional backfill type friction stir spot welding, and the pressing speed is 80-520 mm / min. According to the method, the downward pressing speed of a stirring head is increased, downward pressing force is increased, the heat input rate and the heat utilization rate are increased, meanwhile, the welding insertion time is shortened, heat cannot be dissipated into the surrounding environment in time, the sleeve is pressed downwards, a stirring needle is squeezed back, materials in a cavity are dynamically recrystallized, finally backfilling is conducted, and a defect-free compact-structure welding joint is formed.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a method for improving the welding efficiency of backfill friction stir spot welding. Background technique [0002] Refill friction stir spot welding (RFSSW) is a solid-state joining technology that locally plasticizes the welding material by generating a large amount of heat and strong plastic deformation through the rapid rotation of the stirring tool. This technology is therefore suitable for joining light metals such as aluminum alloys, magnesium alloys or titanium alloys. Since the welding process does not involve the melting and solidification of materials, the solidification defects caused by traditional resistance spot welding can be avoided. [0003] The existing backfill friction stir spot welding is mainly divided into four steps: 1) The pressing ring is pressed on the surface of the upper plate (the material to be welded on the top), and the sleeve ...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/1245B23K20/122
Inventor 申志康陈海燕刘鑫宇李文亚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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