Sub Arc Welding
Automatic purpose built sub-arc welding machine is used for welding of drill rods.
Submerged arc welding, the process requires a continuously fed consumable solid electrode. The molten weld and the arc zone are protected from atmospheric contamination by being “submerged” under a blanket of granular fusible flux. When molten the flux becomes conductive, and provides a current path between the electrode and the work. This thick layer of flux completely covers the molten metal thus preventing spatter and sparks as well as suppressing the intense ultraviolet radiation and fumes that are part of the arc welding process.