Abstract
Titanium (Ti/Ti) rods and titanium and stainless steel (Ti/SS) rods have been joined by diffusion welding under phase transformation in an air atmosphere. Specimens were heated to above the transformation temperature of titanium and cooled below that temperature one, two, or three times by alternately applying and breaking an electric current. The welding process was finished in a few minutes. In Ti/Ti welds no joint interface was observed inside the specimen. With a maximum temperature of 1200–1300 K in the thermal cycling, the bulging ratio was less than 30%, the yield stress was 280 MN m−2 – exceeding 90% of that of the base metal, and the ultimate tensile strength was 380 MN m−2, exceeding 80% of that of the base metal. In Ti/SS welds a joint interface was observed inside the specimen, but there was no gross void at the interface. With a maximum temperature of 1150–1200 K in the thermal cycling, the bulging ratio was less than 30%, the yield stress was 250 MN m−2 – exceeding 90% of that of the stainless steel, and the ultimate tensile strength was 260 MN m−2 – exceeding 60% of that of titanium.
MST/278
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