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A welding power supply is a device that provides or modulates an electric current to perform arc welding. [1] There are multiple arc welding processes ranging from Shielded Metal Arc Welding (SMAW) to inert shielding gas like Gas metal arc welding (GMAW) or Gas tungsten arc welding (GTAW).
Oxy-fuel welding torch (commonly called oxyacetylene welding, oxy welding, or gas welding in the United States) and oxy-fuel cutting are processes that use fuel gases (or liquid fuels such as gasoline or petrol, diesel, biodiesel, kerosene, etc) and oxygen to weld or cut metals.
A third variant, the N3-M-A1, at 2,900 DWT, was a very limited design with diesel-powered ships with superstructure aft instead of amidships. Fourteen built at Penn-Jersey Shipbuilding Co. of Camden, New Jersey. Barnes-Duluth shipyard built 12. The N3-M-A1 were 2,483 gross tons with a length of 291 feet by beam of 42 feet.
Also on the fantail was the Almon Johnson Towing machine which held 2,100 feet (640 m) of 2-inch (51 mm) wire rope capable of a maximum pull of 50 tons. Further, in her salvage holds was an extensive inventory of portable salvage equipment- pumps, generators, and welding machines of various sizes that could be placed wherever needed.
The conversion placed machine, welding and carpenter shops in number two hold along with generators and air compressors supporting engineering work. Number one hold was reserved for construction machinery with number three containing repair stock, portable generators, refrigerated stores and quarters.
A related process, flux-cored arc welding (FCAW), uses similar equipment but uses wire consisting of a steel electrode surrounding a powder fill material. This cored wire is more expensive than the standard solid wire and can generate fumes and/or slag, but it permits even higher welding speed and greater metal penetration.