Diffusion processes in vacuum pressure welding of titanium with stainless steel

The role of diffusion processes in formation of mechanical titanium welded joint of the VT1-0 type with stainless steels of ferrite (2Kh13 steel) and austenite (12Kh18N10T) types is studied. The properties of titanium welded joints with steel are shown to depend essentially on diffusion processes in the zone of a contact, which are, in its turn, determined by welding temperature and time. It is established that reactive diffusion, leading to carbide and intermetallide phase formation, prevents a qualitative joint from preparing. Atomic heterodiffusion of titanium to a steel and iron to titanium to insignificant depth (approximately 2 μm) occurs during welding at T=650 deg C, tau=1...3 min., P=400 MPa in the zone of a contact; features of reactive diffusion are absent and specimens are failed viscously (σsub(v)=490 MPa)