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Keyhole repairing welding method for friction stir welding of thick plate aluminum alloy

A friction stir welding and aluminum alloy technology, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as cracks, and achieve the effect of solving cracks and reducing product scrap rate.

Inactive Publication Date: 2012-06-27
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for keyhole repair welding of thick plate aluminum alloy friction stir welding, which solves the keyhole problem produced in the thick plate aluminum alloy friction stir welding process, and can greatly reduce the product scrap rate on the one hand , on the other hand, it can effectively solve the tendency of cracks caused by heat treatment-strengthened aluminum alloy fusion welding

Method used

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  • Keyhole repairing welding method for friction stir welding of thick plate aluminum alloy
  • Keyhole repairing welding method for friction stir welding of thick plate aluminum alloy
  • Keyhole repairing welding method for friction stir welding of thick plate aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] refer to figure 1 , figure 2 , image 3 , after the keyhole 2 appears during the welding process of the 10mm thick plate part 1, fill the keyhole position with a filling plug 4 of the same quality as the base material, whose shape and size match the keyhole, and then choose a speed of 1200 rpm after filling / min; the friction stir welding welding head 5 with a welding speed of 600mm / min performs secondary repair welding, and 3 is the weld seam. After tensile test analysis, the tensile strength is 185MPa; the metallographic analysis of the microstructure is qualified.

Embodiment 2

[0013] 25mm thick plate parts, friction stir welding process: rotating speed 900 rpm; welding speed 400mm / min. After tensile test analysis, the tensile strength is 175MPa; the metallographic analysis of the microstructure is qualified.

Embodiment 3

[0015] 35mm thick plate parts, friction stir welding process: speed 720 rpm; welding speed 180mm / min. After tensile test analysis, the tensile strength is 170MPa; the metallographic analysis of the microstructure is qualified.

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Abstract

The invention discloses a keyhole repairing welding method for friction stir welding of a thick plate aluminum alloy. The method is characterized by comprising the following steps of: filling a filling plug which is made of the same material as a mother plate into a keyhole position, wherein the shape and size of the filling plug are matched with those of the keyhole; and after filling, performing secondary repairing welding with a friction stir welding process. Due to the adoption of the method disclosed by the invention, the problem of keyholes formed on the thick plate aluminum alloy in a friction stir welding process is solved by using the conventional conditions, the product rejection rate can be lowered greatly, and the tendency of cracks generated by melting repairing adopted for an aluminum alloy which can be thermally treated and strengthened can be eliminated effectively.

Description

technical field [0001] The invention relates to a method for repairing keyholes by friction stir welding of thick aluminum alloys. Background technique [0002] During the double-sided friction stir welding of thick aluminum alloys, keyholes are often left at the welding seam position of the workpiece after accidental parking, and the keyholes need to be eliminated after the product is welded. The current method is to preset the lead-out plate before the friction stir welding of aluminum alloy profiles. Although the keyhole problem of the welding position is solved to a certain extent, the method of pre-setting the lead-out plate is complicated and does not solve the keyhole left by accidental parking during the welding process. question. Therefore, it is very important to find a new method for aluminum alloy friction stir welding keyhole repair to reduce product scrap rate and improve production efficiency. Contents of the invention [0003] The purpose of the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 刘杰张力杨景宏
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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