High-speed train 6005A-T6 aluminum alloy welding method based on fast hot start

Abstract

The invention relates to a high-speed train 6005A-T6 aluminum alloy welding method based on fast hot start, and belongs to the technical field of aluminum alloy welding. The welding method is characterized by adopting an automatic induction heating device for preheating a 6005A-T6 aluminum alloy welding area, wherein under the condition of fast hot start, the welding preheating temperature is 60 to 80 DEG C, the preheating area is the arc starting position of welding, and two-layer two-process welding is adopted during 6005A-T6 aluminum alloy butt-joint; and a high-speed train aluminum alloy joint welding process route is characterized by carrying out welding for the first time by adopting a weld toe as the center and the weld toe on the right side of an original weld pass as a center line, and carrying out welding for the second time by adopting the weld toe on the left side after welding for the first time. According to the welding method, through fast hot start before welding, the local temperature of the welding arc starting part of the aluminum alloy is quickly raised, the hot damage during the welding process is reduced, and the aim of improving the aluminum alloy welding joint structure and performance is achieved.

Description

technical field [0001] The invention relates to a high-speed train 6005A-T6 aluminum alloy welding method based on rapid hot start, which belongs to the technical field of aluminum alloy welding. Background technique [0002] In the past ten years, China is striving to develop the high-speed railway industry, and the manufacturing and repair technology of high-speed trains has made rapid progress. In order to obtain a faster train set, it is imperative to innovate the materials used to manufacture the car body. Since our country has made remarkable progress in the technology of manufacturing high-speed trains, our country has put forward higher requirements for high-speed trains with a speed of more than 250 kilometers per hour. [0003] The aluminum alloy materials used in high-speed trains usually have strong thermal conductivity, and the method of welding aluminum alloy materials for high-speed trains usually adopts fusion welding with concentrated heat, so it is easy to...

AI Technical Summary

Problems solved by technology

[0003] The aluminum alloy materials used in high-speed trains usually have strong thermal conductivity, and the method of welding aluminum alloy materials for high-speed trains usually adopts fusion welding with concentrated heat, so it is easy to produce a softening zone on the welded joint, and in the aluminum A lot of residual stress accumulates in the alloy material, which leads to a serious decline in the mechanical properties of the welded joint

And the deformation phenomenon of aluminum alloy material is also very serious

The softening phenomenon of welded joints will lead to the reduction of the strength of the high-speed train body, which poses a considerable threat to the safety of the train

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