Submerged arc welding wire and flux welding method

Submerged arc welding (including submerged arc surfacing and electroslag surfacing) is a method in which an arc is burned under the flux layer for welding. Its inherent welding quality is stable, welding productivity is high, and there is no arc and smoke. It makes it the main welding method in the manufacture of important steel structures such as pressure vessels, pipe segments, and box beams. In recent years, although many high-efficiency and high-quality new welding methods have appeared, the application field of submerged arc welding has not been affected. From the point of view of the weight of the deposited metal of various welding methods, submerged arc welding accounts for about 10%, and has not changed much for many years.

When the wire is determined (usually depending on the type of steel being welded), the matching flux becomes a key material, which directly affects the mechanical properties of the weld metal (especially plasticity and low temperature toughness), crack resistance, and incidence of weld defects. And welding productivity and so on. The weight ratio of the welding wire to the flux is the welding wire: flux = 1.1 to 1.6, depending on the type of welded joint, the type of flux used, and the welding specification parameters. Compared with smelting flux, the amount of sintered flux is relatively small, about 20% less.