Electron beam welding of titanium alloy to stainless steel with powder metallurgical V/Cu-V composite filler metal
Fusion welding of titanium alloy onto stainless steel is difficult because of the formation of brittle intermetallics. In this paper, composite V/Cu and V/Cu-V filler metals for electron beam welding were designed, based on the metallurgical compatibility of the elements involved. A powder metallurgy method was proposed for manufacture of the V/Cu-V filler metal. Welding experiments were carried out to determine the suitability of these filler metals for electron beam welding. Microstructure was analyzed by optical microscopy, scanning electron microscopy and X-ray diffraction. Mechanical properties of the joints were evaluated by tensile tests. The welding manufacturability of the Cu/V filler metal was poor because of the large differences in thermal and physical properties between copper and vanadium. A non-fusion defect was produced in the joint welded under low heat input, while cracking occurred in the joint welded under higher heat input, as a result of the formation of continuously distributed TiCu, TiFe and τ2 compounds. However, defect free electron beam welded joints characterized by a solid solution of titanium, vanadium and iron were obtained using the powder metallurgical V/Cu-V filler metal. The average tensile strength of the joint was 395 MPa, 72％ of that of the 304 stainless steel.
Titanium alloy Stainless Steel Electron beam Welding Filler metal Microstructure
Ting Wang Binggang Zhang Jicai Feng
Key Laboratory of Special Welding Technology in Shandong Province, Harbin Institute of Technology at State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 92 Xidazhi Str Key Laboratory of Special Welding Technology in Shandong Province, Harbin Institute of Technology at
国际会议
济南
英文
1-12
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）