Dissimilar Joining of Stainless Steel and 5083 Aluminum Alloy Sheets by Gas Tungsten Arc Welding-Brazing Process

[摘要] The dissimilar joining using gas tungsten arc welding - brazing of 304 stainless steel to 5083 Al alloy had been conducted with the addition of Al-Cu eutectic filler metal. The interface microstructure formation between filler metal and substrates, and spreading of the filler metal were studied. The interface microstructure between filler metal and aluminum alloy characterized that the formation of pores and elongated grains with the initiation of micro cracks. The spreading of the liquid braze filler on stainless steel side packed the edges and appeared as convex shape, whereas a concave shape has been formed on aluminum side. The major compounds formed at the fusion zone interface were determined by using X-ray diffraction techniques and energy-dispersive X-ray spectroscopy analysis. The micro hardness at the weld interfaces found to be higher than the substrates owing to the presence of Fe2Al5and CuAl2intermetallic compounds. The maximum tensile strength of the weld joints was about 95 MPa, and the tensile fracture occurred at heat affected zone on weak material of the aluminum side and/or at stainless steel/weld seam interface along intermetallic layer. The interface formation and its effect on mechanical properties of the welds during gas tungsten arc welding-brazing has been discussed.

[发布机构] Department of Mechatronics Engineering, Kyungsung University, Busan; 48434, Korea, Republic of^1;Department of Mechanical Engineering, MVGR College of Engineering, Andhra Pradesh; 535005, India^2;Department of Research and Development, DandH Secheron Electrodes Pvt. Limited, Madhya Pradesh; 452006, India^3;Defence Research and Development Laboratory, Telangana; 500058, India^4;Department of Mechanical Engineering, Marri Laxman Reddy Institute of Technology and Management, Telangana; 500043, India^5

[效力级别] 机械制造

[关键词] 304 stainless steel;5083 aluminum alloys;Energy dispersive x-ray spectroscopy analysis;Gas tungsten arc welding;Interface formation;Interface mi-crostructure;Intermetallic layer;X-ray diffraction techniques