Projection Welding Vs Spot Welding. It is essentially a kind of multi-point spot welding but the position of these welding points is determined by the protruding part of. In spot welding one or more projections are attached to one or two attached work pieces.
ISODIS 14373 Resistance welding Procedure for spot welding of uncoated and coated low carbon steels. Like spot welding the projection welding process relies on heat generated by an electric current to join metal pieces together. Sheets as thin as 025 can be spot welded without issue.
As in spot welding the nugget is formed closer to the electrode with low thermal conductivity.
Projection welding is a kind of contact welding similar to spot welding. In spot weldingonly a small parta small spot is welded with heat pressure. Like spot welding the projection welding process relies on heat generated by an electric current to join metal pieces together. Thus heat balance can be achieved when required by manipulation of these factors.