Postwelding adjusting and repairing method capable of improving metal welding line property

A technology of adjustment and performance, applied in metal processing equipment, welding equipment, non-electric welding equipment, etc., can solve the problems of product fatigue performance, difficulty in large parts, poor bonding, etc., to improve fatigue strength, accelerate aging precipitation, effect significant effect

Inactive Publication Date: 2018-11-23
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although friction stir welding has many advantages for joining aluminum alloys, the performance of the weld also depends on the welding parameters. When the heat input is insufficient or the size deviation is large, poor bonding or even tunnel defects may occur. These Defects have a greater impact on the fatigue performance of the product
In order to improve the performance of aluminum alloy friction stir welded joints, traditional friction stir welds use post-weld heat treatment to improve performance. The post-weld heat treatment method is generally direct high-temperature heating, but this method is difficult for large parts

Method used

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  • Postwelding adjusting and repairing method capable of improving metal welding line property

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Experimental program
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Effect test

Embodiment 1

[0028] Welding equipment adopts domestic dynamic gantry type CNC friction stir welding machine. The test material is a 4mm 6005A-T6 profile, the friction stir welding parameters are 1400r / min, and the welding speed is 600mm / min. Friction adjustment adopts short needle stirring head 2, the length of the short needle is 0.2mm, and rubs again on the welded seam that has been welded. The amount is 0.1mm. The average tensile strength of the friction stir welded state is 168.75MPa, and the tensile strength after adjustment is 176MPa. The results of fatigue experiments show that the fatigue limit value of friction stir welding is 96.29MPa, and the fatigue limit value after adjustment is 105.2MPa. That is to say, the fatigue strength of welded joints can be effectively improved after friction adjustment.

Embodiment 2

[0030] Welding equipment adopts static gantry type CNC friction stir welding machine, the test material adopts 15mm thick 7N01P-T4 plate, and the joint form is butt joint. Friction stir welding parameters are rotational speed 250-400r / min, welding speed 100-400mm / min. The friction adjustment adopts a needleless flat-head stirring head 2 with a clockwise thread groove, and rubs it again on the welded seam that has been welded. The amount of sub-shoulder pressure is 0.2mm. The average tensile strength of the friction stir welded state is 350.2MPa, and the tensile strength after adjustment is 367.7MPa. The results of the fatigue test show that the fatigue limit value of friction stir welding is 117MPa, and the fatigue limit value after adjustment is 125MPa.

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Abstract

The invention relates to a postwelding adjusting and repairing method capable of improving the metal welding line property. After stir friction welding, a short-needle or needle-free stirring head isused, certain axial force is applied to compress the stir friction welding head area, a stirring head rotates, under certain rotating speed and traveling speed, the stirring head runs at least one time along the welding line area, through friction of the stirring head, the welding line area is subject to temperature rise, and aging treatment is carried out; heat generated by friction is used for carrying out one-time rapid heat treatment on the welding line area, through the reasonable temperature rise, welding stress generated by stir friction welding is subject to partial releasing, the fatigue strength of a welding joint can be effectively improved, and compared with the traditional postwelding heat treatment, the method has the beneficial effects of being efficient, simple in process,obvious in effect and the like.

Description

technical field [0001] The invention relates to welding technology, in particular to a post-welding repair method for improving the performance of metal welds. Background technique [0002] Aluminum alloy has the characteristics of low density, high strength, good corrosion resistance, and excellent formability. It is currently widely used in aviation, high-speed trains, and yachts. When the aluminum alloy is arc welded, there are problems such as high welding temperature, serious softening of the welded joint, and a decrease in the strength of the welding heat-affected zone, and defects such as pores, slag inclusions, and cracks are prone to occur, especially for aging aluminum alloy joints. more serious. Friction stir welding (FSW), a solid phase joining technology invented by the British Welding Institute in 1991, has made a breakthrough in joining aluminum alloys. During the welding process, the heating temperature is low and the welding material does not melt, which c...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/122
Inventor 张铁浩张贺张风东党键
Owner CRRC QINGDAO SIFANG CO LTD
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