Role of electroplated interlayer in continuous drive friction welding of AA6061 to AISI 304 dissimilar metals
Role of electroplated interlayer in continuous drive friction welding of AA6061 to AISI 304 dissimilar metals
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DOI：
10.1179/174329308x319217
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发表时间：
2008-10
影响因子：
3.3
通讯作者：
Madhusudhan Reddy;S. Rao;T. Mohandas
中科院分区：
文献类型：
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作者：
Madhusudhan Reddy;S. Rao;T. Mohandas
铝奥氏体不锈钢接头应用于低温发动机、航天器和汽车。由于脆性金属间形成的趋势，这种不同的材料组合不能通过传统的熔焊焊接。据报道，在这种情况下采用固态焊接工艺，如摩擦焊接。研究了AA6061铝合金与AISI 304奥氏体不锈钢的连续驱动摩擦焊接。由于Fe2Al5的形成，这种组合的直接焊接产生了弯曲角度为0°的脆性接头。为了解决这一问题，采用Cu、Ni和Ag作为扩散阻挡层进行焊接。中间层采用电镀复合。由于CuAl2和NiAl3的存在，带Cu和Ni夹层的焊缝也易脆。Ag作为Fe的有效扩散屏障，避免了Fe2Al5的形成。因此，有银夹层的焊缝强度高，延展性好，可弯曲至100°角。
Aluminium austenitic stainless steel joints find application in cryogenic engines, spacecrafts and automobiles. This dissimilar material combination is unweldable by conventional fusion welding due to a tendency for brittle intermetallic formation. Solid state welding processes such as friction welding are reported to be employed in such situations. This paper deals with continuous drive friction welding of AA6061 Al alloy to AISI 304 austenitic stainless steel. Direct welding of this combination resulted in brittle joints with 0° bend angle due to the formation of Fe2Al5. To alleviate this problem welding was carried out by incorporating Cu, Ni and Ag as diffusion barrier interlayers. The interlayer was incorporated by electroplating. Welds with Cu and Ni interlayer were also brittle due to the presence of CuAl2 and NiAl3. Ag acted as an effective diffusion barrier for Fe avoiding the formation of Fe2Al5. Therefore welds with Ag interlayer were stronger and ductile and could be bent to an angle of 100°.