Numerical analysis of dynamic coupling between the keyhole and molten pool in the rotating laser welding process of aluminum alloy

The stirring effect of a rotating laser on molten pool can expand the range heat source and effectively inhibit defects such as pores improve quality weld joint. Due to rotation, physical characteristics dynamic behavior keyhole are more complicated than those conventional welding. This paper adopts numerical simulation method. A three-dimensional model is developed, which takes into account coupling keyhole, recoil pressure, pool. describe keyholes fluid flow formation process mechanism keyhole-induced in welds during It be concluded that welding, deep, narrow, unstable, usually results bubbles. If bubbles fail overflow time, formed. With an increase rotation frequency, becomes shallow wide, tends stable, pores. When frequency increased up 150 Hz, completely suppressed.