Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 12    December 2014

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Electron beam welding of 304 stainless steel to QCr0.8 copper alloy with copper filler wire
Bing-gang ZHANG, Jian ZHAO, Xiao-peng LI, Ji-cai FENG

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Abstract:Electron beam welding (EBW) of 304 stainless steel to QCr0.8 copper alloy with copper filler wire was carried out. Orthogonal experiment was performed to investigate the effects of process parameters on the tensile strength of the joints, and the process parameters were optimized. The optimum process parameters are as follows: beam current of 30 mA, welding speed of 100 mm/min, wire feed rate of 1 m/min and beam offset of -0.3 mm. The microstructures of the optimum joint were studied. The results indicate that the weld is mainly composed of dendritic α phase with little globular ε phase, and copper inhomogeneity only occurs at the top of the fusion zone. In addition, a melted region without mixing exists near the weld junction of copper side. This region with a coarser grain size is the weakest section of the joints. It is found that the microhardness of the weld decreases with the increase of the copper content in solid solution. The highest tensile strength of the joint is 276 MPa.

 

Key words: 304 stainless steel; QCr0.8 copper alloy; electron beam welding; dissimilar joint; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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