Pore formation during C. W. Nd: YAG láser welding ofaluminum alloys for automotive applications
DOI:
https://doi.org/10.3989/revmetalm.2000.v36.i2.562Keywords:
Pore formation, Nd, YAG láser welding, Aluminum alloysAbstract
Pore formation is an important concern in laser welding of automotive aluminum alloys. This paper investigates the influence of the laser beam defocusing on pore formation during continuous wave Nd: YAG laser welding of aluminum automotive alloys 5182 and 5754. It was found that the instability of the keyhole during welding was a dominant cause of pore formation while hydrogen rejection played an insignificant role. The defocusing of the laser beam greatly affected the stability of the keyhole. Finally, the mechanism of the collapse of the keyhole and pore formation is proposed.
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