Laser technology has received special attention in the field of aluminum alloy welding due to its characteristics of low welding heat input, little influence of welding heat area and not easy deformation. But on the other hand, due to its own defects, there are three major welding difficulties in aluminum alloy laser welding. So how to solve it ingeniously?
Difficulties in welding 1. Low laser absorption rate of materials
1. Take appropriate surface pretreatment process. For example, sandpaper polishing, surface chemical etching, surface plating and other pretreatment measures. Increase the absorption rate of the material to the laser light.
2. Reduce the spot size and increase the laser power density.
3. Change the welding structure to make the laser beam form multiple reflections in the gap, which is convenient for aluminum alloy welding.
Difficulty in welding 2. It is easy to generate pores and hot cracks
After many welding experiments and studies, it was found that adjusting the laser power waveform during the welding process can reduce the unstable collapse of the pores, changing the angle of the laser beam irradiation and applying a magnetic field during welding can reduce the pores generated during welding.
Difficulties in welding 3. During the welding process, the mechanical properties of the welded joints decrease
The mechanical properties of the welded joints are caused by the instability of the pores produced by the welding of aluminum alloys. Aluminum alloy mainly includes three elements: Zn, Mg, and Lv. When welding, aluminum has a higher boiling point than the other two elements. Therefore, some low-boiling alloy elements can be added when aluminum alloy elements are welded, which is conducive to the formation of small holes and the firmness of welding.
The high efficiency of aluminum alloy laser welding processing makes people look forward to its development prospects. Therefore, some researchers continue to develop new technologies such as laser-arc conforming technology and dual-focus technology to improve the stability of the welding process and improve the quality of the weld.
Post time: Mar-10-2022