What steps are necessary to connect the weld output terminals?

Turn off power before connecting. Remove the supplied nut from the weld output terminal and slide the weld cable terminal onto it, securing with a nut so that it tightens against the copper bar. Ensure surfaces of the weld cable terminal and copper bar are clean and no objects are placed between them (Page 10).

From the official Miller Millermatic 350p manual, page 10

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