EFFECT　OF　TRANSITION　METAL　Ni　ON　WELDING　PROPERTIES　OF　TITANIUM　ALLOY　STAINLESS　STEEL

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With increase of Ti alloys use in industry, weld of Ti alloys to steel becomes more and more impotant. Microstructures and properties of diffusion welded joint of TC 4 to 1Cr18Ni9Ti adding the transition metal Ni have been observed with microscopy, SEM, EPMA and tested by tensile tests, respectively. The results show that atom diffusion and migration between Ti and Fe or C are effectively prevented by adding pure Ni as transition metal and a film joint is obtained. The properties of welded joint depend on weld rate of Ti to stainless steel and the thickness of Ni Ti metallic compounds. The optimum weld parameters are as follows: weld temperature is 850 ℃, weld time is 5 min, weld specific stress is 10 MPa.