FIELD: welding, namely processes for welding tubes of aluminium alloys with tubes of stainless steel. SUBSTANCE: method comprises steps of making intermediate layer on end of tube of stainless steel and welding tube of aluminium alloy with said layer; making intermediate layer at joining titanium alloy sleeve with sleeve of stainless steel by diffusion welding in the form of tubular adaptor; joining sleeve of stainless steel with tube of stainless steel by fusion welding; joining end portion of sleeve of titanium alloy with tube of aluminium alloy by welding-soldering; spacing welded-soldered joint from diffusion welded joint by distance not allowing secondary heating of diffusion welded joint. One end of sleeve of titanium alloy may be placed inside sleeve of stainless steel; its other end may be placed outside tube of aluminium alloy. At welding-soldering sleeve of titanium alloy with tube of aluminium alloy, temperature in zone of their contact is sustained no more than 1100 C. EFFECT: stable high quality of welded joint. 4 cl, 3 dwg
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