Abstract
In this study, high frequency induction heating assisted spot friction stir welding was applied to 1.6mm thick S12C low carbon steel plates. With the same welding parameter including an applied load of 2500kg, rotation speed of 800rpm and dwell time of 2s, the average grain size in the stir zone slightly increased from 12.9μm for the welds without preheating to 14.8μm when 10s preheating was used. However, larger joint interface was formed within the stir zone of the welds with preheating and therefore the bonding strength can be significantly increased. As a result, the shear tensile load of the joint increased from 8kN to12.4kN with preheating and the joint fractured through the plug failure mode rather than interfacial failure mode. It was revealed that the frictional heat generated between the rotating tool and the work-piece can be reduced to obtain sound welds by means of high frequency induction preheating.
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