Discussion
Which of the following is not a resistance welding?
Answer: C
The one that is not a type of resistance welding is pressure welding.
Pressure welding is the broad family of processes that join metal by applying pressure, with or without heat. Resistance welding is one member of that family, not the other way round, so pressure welding is not a resistance welding process.
Spot welding, butt welding and percussion welding are all genuine resistance processes: in each, the heat comes from passing a heavy current through the parts at the joint, with pressure applied to complete the weld.
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