Welding characteristics and mechanical property of rotating laser welding-brazing of aluminum alloy to steel

Rotating laser welding-brazing technology was developed to fabricate aluminum alloy and steel joint. The effects of laser rotating diameter and frequency on wettability, interfacial microstructure, welding temperature field and mechanical property were studied. The brazed width decreased as rotating diameter increases. IMCs layer could not be observed with rotating diameter of 4 mm. The maximum line load of joint reached 271.1 N/mm with rotating diameter and frequency of 2 mm and 50 Hz, which was about 30.3% higher than that without rotating laser. The thickness of IMCs interlayer decreased and formation of brittle theta-Fe(Al, Si)3 phase was suppressed, since peak temperature and temperature gradient at interface decreased with optimized laser rotating parameters. Consequently, the line loads of joints were improved significantly.

Automated summary

This study investigated the effect of laser rotating diameter and frequency on laser welding-brazing joint, and found that optimized laser rotating parameters significantly improved the line load of joints.