Abstract
This study investigated the effect of nanograin formation on joint strength through sliding friction during ultrasonic welding (USW). The nanograined austenite phase would induce the surface strengthening effect, potentially impeding the bonding process. A bonding strength exceeded 2000 N within a short welding duration of 2.5 s. Interestingly, the strength was attributed to ultrafine-grained interfacial microstructure resulting from the plastic flow during processing. This unique nanograined microstructure formed from dynamic recrystallisation unexpectedly facilitated the bond formation rather than hindering the bonding process. This study gained insights into the critical interfacial microstructure required for the USW of metals and alloys with high melting temperatures.
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