几种常见合金的激光扫描焊接特性及研究现状

激光扫描焊接是一种高效的新型激光焊接技术,具有独特的激光束定位方式、扫描范围广、灵活性高、工作距离长等优点,相比于传统激光焊接,其多点焊接的特性能在很大程度上提升焊接效率.概述了激光扫描焊接技术的工作原理和分类,重点阐述铝合金、镁合金、钛合金、铜及铜合金、铝-钢异质合金几种常用合金的激光扫描焊接特性及研究现状.扫描激光...

Laser Scanning Welding Characteristics and Research Status of Several Common Alloys

Laser scanning welding is a highly efficient new laser welding technology, with unique laser beam positioning,wide scanning range, high flexibility, long working distance and other advantages, compared to traditional laser welding, its multi-point welding characteristics can largely enhance the welding efficiency. Overview of the working principle and classification of laser scanning welding technology, focusing on the laser scanning welding characteristics and research status of several common alloys such as aluminum, magnesium, titanium, copper and copper alloys, and aluminum-steel. The stirring effect of the scanning laser beam on the molten pool can effectively improve the defects in the aluminum alloy weld, the microstructure of small holes and the force changes in the welding process is a breakthrough point for future research on scanning laser welding of aluminum alloys. Laser scanning welding can significantly improve the quality of weld forming of magnesium alloys, optimization, control, adjustment of different laser scanning welding process parameters operating window and the development of relevant process specifications, as well as how to control the formation of the intermediate phase and its content is the focus of research on scanning welding magnesium alloys need to break through. An important difficulty in laser scanning welding of titanium alloys is the instability of the keyhole during the welding process, which largely affects the weld formation. The stability of the keyhole depends on its force state, so the first step is to control the movement of the laser beam(such as scanning trajectory, scanning amplitude, scanning frequency, etc.). The low absorption and high thermal conductivity of copper and copper alloys require higher laser power for scanning welding copper. The required equipment, high cost and possible inclusions limit the diffusion of the process, and more research is still needed to understand the mechanism of scanning welding of copper alloys and to overcome the problems of low process stability, large spatter and high porosity during welding. Laser scanning welding of other heterogeneous alloys such as magnesium-aluminum, aluminum-copper, magnesium-titanium, titanium-aluminum alloy will also be the focus of future laser scanning welding research. Finally, for the shortcomings in the existing research proposed laser scanning welding challenges and future development trends.