Mar 30, 2021
A few days ago, the research and development of coaxial maglev trains ushered in a new breakthrough. Recently, the high-speed maglev test prototype with a speed of 600 kilometers per hour was successfully tested in Shanghai.
For rail trains to achieve the speed of "flying close to the ground", participants must successfully reduce weight, which is called "lightweight" in industry jargon. Lightweight rail trains, especially high-speed rail, double-deck passenger cars and subway trains, are the focus of rail transportation modernization, and the extensive use of aluminum alloy materials is an effective way to achieve lightweight vehicles and increase train speeds.
Although aluminum alloy is good, this material is recognized as a "hard-to-weld" material:
1. The variability of welds;
2. The weld joint is softened seriously and the strength is reduced;
3. There are many pores inside the weld, which is easy to crack;
4. The weld is easy to collapse, causing serious undercut.
Because laser welding has high aspect ratio, small weld width, small heat-affected zone, small deformation, fast welding speed, high weld quality, no porosity, accurate correction, small focus spot, and positioning during the welding process. It has the advantages of high precision and easy automation, so it is widely used in the processing and manufacturing of rail transit equipment.
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