Solid-phase Welding between Chromium Bronze and Wolfram Alloy based on Superplasticity of Chromium Bronze

The feasibility of solid-phase welding between chromium bronze and wolfram alloy was explored under the condition of superplastic deformation of chromium bronze. The results show when the sample surfaces of chromium bronze and wolfram alloy to be welded were carefully cleaned, pre-pressed under 10~30 MPa. at the welding temperature of 740~800℃ and at initial strain rate of(1.67~13.3)×10^-4s^-1, the shear strength of butt joint is up to or close to that of chromium bronze base metal in 3~10 minutes pressure welding, so that the solidphase welding can be finished. The chromiumbronze takes place superplastic deformation in welding process, but the deformation of wolfram alloy is little. The atoms of two sides at initial interface appears obvious diffusion.