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EFW Steel Pipe
EFW STEEL PIPE is the abbreviation of electric fusion welding. One of the Submerged Arc Welding (SAW)-Electric Welding(EFW) is a process in which metal is heated by one or several consumable electrodes and a workpiece to heat the metal,and the ARC is used to make the metal and the part of the filling metal is all from the electrode,Melt gas shielded welding(GMAW)-A type of electro fusion welding(EFW)that is similar to Submerged Arc welding,but its protection comes from inert gases and works better.