Submerged arc welding technology (SAW), is the molten welding process where the arc is created by electrodes (welded wire) and the solder is protected under the drug layer. Welding to avoid the harmful effects of air.

Under the effect of the heat emitted by the arc, the weld bead, the welded wire and a part of the solder with special components along with the speed of movement corresponding to its rate of combustion, Welded.

On the surface of solidified puddle will form a slag layer that will be involved in metallurgical processes during welding. This technology is automated from the supply chain, supplying the drug to the arc and moving the arc along the weld shaft. This is why this welding technique is called “automatic arc welding under the drug layer”. If automatic stitching of the wires into the arc area is not required, the arc welding of the welds is done by hand, which is called “semiautomatic arc welding under the drug layer”.

The drug coat covers the weld from harmful effects of the air and the external environment. The composition of the drug class is usually lime, silica, calcium fluoride and other compounds. The technology of welding under the drug layer requires high investment in equipment so it is usually only applied to mechanical welding. Under-layer welding process is operated under different currents from 300 to 2000A, many cases up to 5000A. Welding technology under the drug layer makes the welds more profound than other welding methods. Due to the coating of the drug layer, the welder also avoids the effect of the light generated by the arc.