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S. Sahu et al.
Fig. 5.13 Mechanical interlocking phenomenon; formation of sawtooth structure in FSW in lap
configuration
Fig. 5.14 Sawtooth
structure in Al-steel FSW
joint
interlocking has been observed as the hard steel is pushed upward into the softer Al
surface by the action of the rotating tool.
5.6 Case Study on Dissimilar Material Welding by FSW
The environmental concerns such as controlling CO 2 emissions have commanded
the transportation sector to make use of dissimilar material to manufacture components. Thus, it is crucial to identify an arrangement of metals that will optimize the
weight and at the same time provide appreciable strength during crash situations.
Light-weight structures with aluminium (Al) alloys and steel have shown a good
combination in this regard. Al alloys deliver lower density and higher strength, and
steel increases the stiffness [15]. Therefore, to attain the benefits out of this combination, a proper welding method is required to be adopted. One of the uses of Al-steel
hybrid structure in automotive sector is the Honda manufactured sub-frames [43].
S. Sahu et al.
Fig. 5.13 Mechanical interlocking phenomenon; formation of sawtooth structure in FSW in lap
configuration
Fig. 5.14 Sawtooth
structure in Al-steel FSW
joint
interlocking has been observed as the hard steel is pushed upward into the softer Al
surface by the action of the rotating tool.
5.6 Case Study on Dissimilar Material Welding by FSW
The environmental concerns such as controlling CO 2 emissions have commanded
the transportation sector to make use of dissimilar material to manufacture components. Thus, it is crucial to identify an arrangement of metals that will optimize the
weight and at the same time provide appreciable strength during crash situations.
Light-weight structures with aluminium (Al) alloys and steel have shown a good
combination in this regard. Al alloys deliver lower density and higher strength, and
steel increases the stiffness [15]. Therefore, to attain the benefits out of this combination, a proper welding method is required to be adopted. One of the uses of Al-steel
hybrid structure in automotive sector is the Honda manufactured sub-frames [43].