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2 Introduction General Description of Submerged Arc Welding Definition Submerged are welding is a method in which the heat required to fuse the metal is generated by an arc formed by an electric current passing between the welding wire and the workpiece. The tip of the welding wire, the arc, and the workpiece are covered by a layer of granulated mineral material known as submerged arc welding flux. There is no visible arc and no sparks, spatter or smoke. General Scope Welding Current - Currents up to 2,000 amperes, a.c. or d.c., on a single welding wire electrode have been used. Thicknesses - One-pass welding up to 1-1/2-in. thick and multipass welding to any thickness can be done. Practical minimum thickness is 18-gage. Welding Speed - Up to 150 inches per minute with a single welding wire. Higher speeds may be attained with multiple electrodes in the same welding zone. Position - High welding current with resulting high rate of heat input creates a large pool of liquid metal. Under such conditions, welds must be kept horizontal to prevent spilling. Welds in which the pool is small may be inclined as much as 15 degrees from the horizontal without causing difficulties. If the size of the individual passes is limited, horizontal welds can be made on vertical surfaces if a suitable support is provided for the welding flux. Continued on next page...