Abstract

Reducing welding defects and improving welding manufacturing speed are important for the development of automated welding technology. Low-power pulsed laser–induced TIG hybrid welding method was used to join 6061-T6 aluminium alloy. The formation mechanism of porosity during the high speed welding process was investigated in different parameters, such as pulse frequency, pulse duration, pulse energy and arc current. The results showed that the pulse duration made influence on the energy fluctuations in the welding process, and there was an interaction between laser frequency and welding speed. The energy state of the pulsed laser became a key factor affecting the welding defect and appropriate arc current can effectively decrease the porosity generation.

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