Submerged-arc welding (SAW) is a common arc welding process that involves the formation of an arc between a continuously fed electrode and the workpiece. A blanket of powdered flux generates a protective gas shield and a slag which protects the weld zone. Although SAW is normally operated with a single wire using either AC or DC current, there are a number of variants including the use of two or more wires, and adding metal powder additions. SAW is ideally suited to the longitudinal and circumferential butt welds required for the manufacture of line pipe and pressure vessels.
It also has wide acceptance for welding heavy fillet welding preferably in a flat welding position and to get moderate size fillet weld in horizontal welding position in structural fabrication items.
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