The titanium alloy was welded by argon tungsten arc welding(TIG) under longitudinal magnetic field. The magnetic field current was adjusted during the welding process. The tensile test, hardness test and microstructure of the welded joint were detected to explore the rules of magnetic field current for mechanical properties and microstructure of the welded joint, under different magnetic field current. The results show that: the external magetic field can improve the comprehensive properties of welded joint...