Abstract
Friction Stir Welding (FSW) was applied to dissimilar metal lap joints of thick plates between A3003 aluminum alloy and SUS304 stainless steel. The strength of the joints was dependent on the probe diameter of FSW tools when the sound welds were obtained with radiographic testing (RT) and ultrasonic testing (UT). In this case, the width of welds was approximately 75% area of the probe diameter and the joint fractured at A3003 base metal. Furthermore, larger joints were considered to fabricate by multi-pass FSW. When optimizing the shape of the joint and the configuration of FSW path (the number and position of FSW), it was demonstrated that large-scale structural joints of A3003 aluminum alloy and SUS304 stainless steel could be produced using the dissimilar lap FSW technique.
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