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Why Coated Steel Welds Differently: Galvanised, Primed and Painted Sheet Most of the sheet metal that arrives at our bench is not bare steel. It is galvanised, or primed, or painted, and in each case there is a second material in the joint that was not there when the welding procedure was written. ...

Where the Heat Goes in Resistance Spot Welding Two identical machines, the same programme and the same sheet thickness can produce one joint that peels cleanly and one that leaves a mark with almost no nugget. The difference is rarely the machine. It is where the heat actually went, and how much of ...