High frequency pulse tungsten arc welding process trials of TA15 titanium alloy are carried out. The microscopic structures and properties of weld with high frequency TIG and conventional TIG are compared based on metallographic test and mechanical test. The results show that the width of high frequency TIG weld is obviously narrower and the grain size is decreased by more than 30%. It also shows that the alpha phase layer is thicker than that of the conventional welding

and the distribution is more regular and more ordered. The tensile strength of the ultra high frequency pulse welding joint is equal to that of the conventional argon arc welding

and the plasticity is better

the fatigue property is higher.