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Also known as SAW, it was originally implemented by the Linde-Union Carbide Company. The process being quite similar to the MIG requires a steady stream of high pressure gas to be supplied to the electrode. The gases and the slag are produced by a flux generated as current is supplied to the electrode. Submerged welding does not in essence need any protective gases for the co-joining. Instead in the place of the inert gases, some sort of powder is placed on the metal surface being worked on. Any fused slag that remains after welding can be extricated from the surface.