The self-regulation phenomenon that occurs during friction welding process was characterised, and the effect of the self-regulation of the energy-related parameters on structure and hardness distribution in SW7Mo steel – 55 steel welded joint was determined experimentally. The structure and hardness of the weld zone were examined, the energy required for the stable run of a friction welding process was calculated, and a relationship between the welding energy and weld hardness was derived.
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