The relation between magnesium evaporation and laser absorption and weld penetration in pulsed laser welding of aluminum alloys: Experimental and numerical investigations

摘要: Abstract It is observed that in laser welding of aluminum alloys, magnesium can evaporate, and the weld penetration dependent on Mg content alloy loss from pool. In this research, it proposed presence not base metal alloy, but rather vapor plasma plume over pool affects absorption, through phenomenon profile affected. Numerical simulation was performed to determine relationship between estimate effective absorption coefficient four Al alloys parallel EPMA technique used losses metals. The combined analysis results showed increasing pulse energy (decreasing frequency), evaporation increased, that, turn, increased coefficient. However, more power does necessarily mean penetration. Laser penetration, once threshold rate 200 ×  10 - 6 g/cm2 passed.