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Paper presents a new process of refurbishing by metal deposition in different zones of the used parts, the refurbishment by welding in the ultrasonic field. A comparative analysis of the main defects is made, that occur in the case of welding in the protective gas comparing with the process of refolding by welding in protective gas medium with the ultrasonic activation of the additive material. In the case of the refurbishment by ultrasonic welding of used parts, the problem that concerns most is the appearance an...