Abstract
Aluminum alloy and steel sheets were welded by coupled YAG laser beams. The welding system consisted of continuous wave YAG laser and pulsed wave YAG laser oscillators. Overlapped laser beams were irradiated on the surface of steel sheet placed on aluminum alloy sheet. Optical microscope observation and electron probe micro analysis (EPMA) were examined. Because of deep weld penetration formed by pulsed beam and slow solidification by continuous beam heating, any cracks and porosities were not observed in the weld bead. The results of EPMA suggested that intermetallic compound layers such as Fe3Al and FeAl existed at aluminum/steel interface.Aluminum alloy and steel sheets were welded by coupled YAG laser beams. The welding system consisted of continuous wave YAG laser and pulsed wave YAG laser oscillators. Overlapped laser beams were irradiated on the surface of steel sheet placed on aluminum alloy sheet. Optical microscope observation and electron probe micro analysis (EPMA) were examined. Because of deep weld penetration formed by pulsed beam and slow solidification by continuous beam heating, any cracks and porosities were not observed in the weld bead. The results of EPMA suggested that intermetallic compound layers such as Fe3Al and FeAl existed at aluminum/steel interface.
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