Friction welding is a solid-state bonding process that presents itself as an interesting option as it generates less residual stress, less\ndistortion, and crack formation when compared to the fusion welding process. The characteristics of this process also allow\nsatisfactory welding of dissimilar materials, with good results in terms of mechanical strength. In this work, the butt welding of\naluminum ASTM A6351-T6 and SAE 1020 steel was carried out aiming at evaluating the effects of the initial contact geometry on\nthe mechanical properties of the welded joint. The methodology consisted of friction weld aluminum bars with different initial\ncontact geometry with steel bars in a machine specially developed for the application. The results indicated the influence of this\nparameter on the mechanical properties of the welded joint.
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