Abstract
In general, Friction stir welding (FSW) of aluminum alloy is carried out usually by mild steel (MS) backing plate due to high load carrying capabilities than other backing plate. However, the backing plate material is one of important factor to control the quality of joint. Hence an effort has been made to use titanium backing plate as the material during FSW. In this wok, AA2014-T6 sheets were friction stir welded with the aid of two dissimilar backing plate, namely MS and Ti alloy. The results indicate that the MS backing plate with greater conductivity effectively reduces the temperature distribution to the weld zone in due course of FSW. Whereas in Ti backing plate, due to less conductivity, the size of equi-axed grain increases as a result of peak temperature in the weld zone. The peak hardness of the weld zone considerably increases for MS backing plate. On the other hand, the hardness distribution on the joint welded using Ti backing plate yields inferior hardness. Moreover, the increase of strength welded with MS backing plate may be attributed due to the density distribution of precipitates (Al 2 Cu).
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