Effects of Gap Width and Groove on the Mechanical Properties of Butt Joint Between Aluminum Alloy and Stainless Steel
来源期刊：Acta Metallurgica Sinica2013年第2期
论文作者：Honggang DONG Chuanqing LIAO
文章页码：143 - 148
摘 要：Butt joining of 5A02 aluminum alloy to 304 stainless steel sheets was conducted using gas tungsten arc welding process with Al-12%Si （wt.%, the same below） and Zn-15%Al flux-cored filler wires. The effects of gap width and groove in steel side on the microstructure and tensile strength of the resultant joints were investigated. For the joint made with 0 mm-wide gap and without groove in steel side, severe incomplete brazing zone occurred along the steel side and bottom surfaces, and consequently seriously deteriorated the joint strength. However, presetting 1.5 mm-wide gap or with groove in steel side could promote the wetting of molten filler metal on the faying surfaces, and then significantly enhance the resultant joint strength. Moreover, post-weld heat treatment could further improve the tensile strength of the joints. During tensile testing, the specimens from the joints made with Al-12%Si flux-cored filler wire fractured through the weld or interfacial layer, but those from the heat-treated joints made with Zn-15%Al flux-cored filler wire fractured in the aluminum base metal.
Honggang DONG1，Chuanqing LIAO1,2
1. School of Materials Science and Engineering, Dalian University of Technology2. Shanghai Aerospace Equipments manufacturer
摘 要：Butt joining of 5A02 aluminum alloy to 304 stainless steel sheets was conducted using gas tungsten arc welding process with Al-12%Si （wt.%, the same below） and Zn-15%Al flux-cored filler wires. The effects of gap width and groove in steel side on the microstructure and tensile strength of the resultant joints were investigated. For the joint made with 0 mm-wide gap and without groove in steel side, severe incomplete brazing zone occurred along the steel side and bottom surfaces, and consequently seriously deteriorated the joint strength. However, presetting 1.5 mm-wide gap or with groove in steel side could promote the wetting of molten filler metal on the faying surfaces, and then significantly enhance the resultant joint strength. Moreover, post-weld heat treatment could further improve the tensile strength of the joints. During tensile testing, the specimens from the joints made with Al-12%Si flux-cored filler wire fractured through the weld or interfacial layer, but those from the heat-treated joints made with Zn-15%Al flux-cored filler wire fractured in the aluminum base metal.
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