Influence of Laser Remelting for Back Weld on Microstructure Properties of High Speed FA-MIG Welded Ti/Al Joint
The critical problem that Ti/Al dissimilar single-sided high speed FA-MIG welding faced to is the great difference in Ti/Al interfacial structural properties.Laser remelting on the back weld was used to deal with the Ti/Al interfacial heterogeneity and improve the joint mechanical properties.Contrastive analysis was conducted to study the influence of laser offset to the Al side d,laser power q,and welding speed v on the joint structural properties.The results showed that the joint structural properties were greatly influenced by d,q,and v.With optimal parameters of d=2 mm,q=1.3 kW,v=5 mm·s-1,the Ti/Al interfacial reaction layers thickness of the remelted joint root increased and difference in microstructure in the thickness-direction decreased;the tensile strength of the joint reached>280 MPa,which is approximately 20%higher than that of untreated joints;the tensile fractured surface exhibited fracture mechanism of plastic+ductile mixed.
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