Spreading behavior and microstructure characteristics of dissimilar metals TIG welding–brazing of aluminum alloy to stainless steel
Spreading behavior and microstructure characteristics of dissimilar metals TIG welding–brazing of aluminum alloy to stainless steel
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DOI：
10.1016/j.msea.2009.02.036
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发表时间：
2009-05
期刊：
影响因子：
6.4
通讯作者：
Jianling Song;Sanbao Lin;Chaozhi Yang;G. Ma;Huijie Liu
中科院分区：
文献类型：
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作者：
Jianling Song;Sanbao Lin;Chaozhi Yang;G. Ma;Huijie Liu
采用4047 Al-Si共晶钎料和改性无腐蚀性助焊剂，对5A06铝合金与SUS321不锈钢进行了异种金属TIG焊钎焊。研究了钎料在焊槽表面的扩散行为和对接接头的显微组织特征。液态填充金属的扩散行为包括两部分：一是扩散到钢的背面以填充钢；另一种是在槽的正面上坡铺开，形成良好的钎焊缝。界面层厚度在5 ~ 35μm之间，不同位置的界面层厚度不等。由三种不同的IMC层组成：从焊缝到不锈钢，第一种是τ5-Al7.2Fe2Si和α-Al相，第二种是η- fe2al5相，第三种是fesi2和η- fe2al5相。对接接头的平均抗拉强度达到120.0MPa，界面层发生断裂。当其厚度超过10μm时，脆性η- fe2al5界面层顶部产生裂纹。
Dissimilar metals TIG welding–brazing of 5A06 aluminum alloy to SUS321 stainless steel had been conducted using 4047 Al–Si eutectic filler metal and modified non-corrosive flux. And spreading behavior of filler metal on the groove surface and microstructure characteristics of the butt joint were investigated. The spreading behavior of liquid filler metal consisted of two parts: one was to spread on the back face to pack the steel; the other was to uphill spread on the front face of the groove to form a sound brazed seam. The interfacial layer, unequal in thickness at different position, ranged from 5μm to 35μm. And it was made up of three different kinds of IMC layers: from the welded seam to stainless steel, the first was τ5-Al7.2Fe2Si and α-Al phases, the second was η-Fe2Al5phase, and the third was FeSi2and η-Fe2Al5phases. Average tensile strength of the butt joint reached 120.0MPa and fracture occurred at the interfacial layer. Cracks derived from the top part of brittle η-Fe2Al5interfacial layer when its thickness exceeded 10μm.