Discussion
Projection welding is.......
Answer: A
Projection welding is a multi-spot welding process.
Small projections are pressed into one of the parts beforehand. When the electrodes clamp the parts and the current flows, it concentrates at the projections, so several spot welds form at once, in a single operation.
Cross-wire welding of mesh is one use of the same principle, with the wires themselves acting as projections, but it is an application, not a description of the process. Continuous spot welding describes seam welding, and making cantilevers is not what the process is for.
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