The results of recent researches on the weldability of laser/arc hybrid welding of AZ-based Mg alloy was presented.Experiments were conducted with a low-power(500 W) Nd:YAG laser and a TIG arc.The synergic effects and mechanical properties of the Mg joints by laser/arc hybrid welding were investigated,and the interaction mechanism of laser to arc was also discussed.The results show that Mg alloys can be easily welded in similar and dissimilar joints by laser/arc hybrid welding technique.With the arc power increasing,a higher weld depth is obtained,and the weld depths for laser and arc acting in combination(laser/arc) are two times higher than that of the total of laser and arc acting separately(laser+arc) in optimal conditions.The tensile strength and fatigue strength of the AZ31B joints welded by laser/arc hybrid process are equivalent to that of the based metal.Besides,the laser-induced plume/plasma images captured by high speed camera were used to study the interaction between laser beam and arc.
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