Laser-TIG Hybrid Welding of Magnesium Alloy T-Joint with Cold Filler Wire

Abstract

The weldability of magnesium alloy T-joint using laser-TIG hybrid welding heat source with cold filler wire was studied in this paper. The effects of welding parameters (wire feeding angle α, wire feeding speed V_W, welding speed V, shielding gas flow rate acts on either of the connect corner Q_C, the distance between filler wire and laser beam D_LW) on weld appearance and penetration were discussed. Results show that high-quality magnesium alloy T-joint can be achieved by adjusting the parameters. Shearing test result indicates that shear strength of the T-joint welded by laser-TIG heat source can be as high as 92.3% of that of base metal.