Effects of Welding Current on Elements Diffusion and Microhardness of Ti_3Al/TC11 Welding Interface
Ti3Al and TC11 alloy were joined by electron beam welding,and then the alloying elements diffusion and microhardness of the welding interface obtained under different welding currents were investigated.The results show that the welding current has a little effect on the alloying elements diffusion at the welding interface.There is larger concentration gradient in the weld and the interfaces among the two bases,which is attributed to the insufficient diffusion because of the coarse-solidified structure and phase transformation in the cooling after welding,inadequate energy and time.Whatever the welding current is,the microhardness of the weld is the highest along the whole specimen.The microhardness in the weld and the TC11 side increases with increasing welding current.However,the effect of welding current on the microhardness in the Ti3Al alloy side has not obvious regularity,