Submerged arc welding generally refers to the method in which the arc is burned under the flux layer for welding. From the appearance, the arc is buried under the flux layer, so it is called submerged arc welding. Generally, the welding wire is automatically fed by a machine. When welding, a layer of granular flux is covered on the welding area, and the arc burns under the flux layer to melt the end of the wire and the local base metal to form a weld.
Submerged arc welding can use a larger current. Compared with manual arc welding with electrodes, because there is no manual participation in the welding process, the big advantage is that the weld quality is good, the welding speed is high, and its work efficiency can be dozens of times that of manual arc welding. . Therefore, it is particularly suitable for welding straight seams and circular seams of large weldments, and this welding method has a high degree of mechanization, and the quality of welds generally does not change due to the deterioration of welders' quality. It has been widely used in welding carbon steel, low alloy structural steel, stainless steel, etc. Because slag can reduce the cooling rate of joints, some high-strength structural steels and high-carbon steels can also be used.
Disadvantages: Due to the use of granular flux and the large current, submerged arc welding generally can only be operated at the flat welding position, and cannot achieve full position welding. At the same time, the operation is not flexible, and it is not suitable to weld complex welds.