Submerged arc welding is a kind of welding method which takes the arc as the heat source and carries out arc combustion in the welding state. Due to the deep penetration, high productivity, and high degree of mechanization of arc welding, it is suitable for welds of medium and heavy plate structures. Submerged arc welding is one of the most widely used welding methods in welding production, but it can only be wielded at the flat welding position.

The main welding parameters of submerged arc welding include welding current, arc voltage, welding speed, wire diameter, and wire extension length. The welding materials for submerged arc welding include welding wire and flux, which shall be selected according to the mechanical properties and chemical composition of the base metal, groove form, thickness, process conditions, and structural dimensions. Welding wire and flux matching with steel strength can be selected for low alloy steel and low carbon steel, and other standard requirements shall be met at the same time. Carbon steel H08A and H08MnA welding wires, high manganese, and high silicon flux, or H08MnA and H10Mn2 welding wires, matched with low fierce manganese free flux.

Low alloy high strength steel welding wire shall be used for low alloy high strength steel, and sintering flux can also be used when medium fierce medium silicon or low manganese medium smelting flux is selected.

The surface quality of welding wire, such as diameter deviation, surface hardness, and curvature uniformity, will affect the stability and quality of the welding process. Therefore, the welding wire shall be checked and the bending shall be eliminated before loading. Dry before use. The particle size of flux affects the air permeability and has a certain impact on the weld formation and internal quality. When the flux size remains unchanged, if the welding current is increased, the arc will be unstable and the weld surface and edge will be uneven. The larger the current is, the larger the flux particle size should be.

The welding speed has an effect on the width and depth of penetration. When other conditions remain unchanged, the welding speed decreases significantly with the increase of welding speed. The increase of the arc backward angle is conducive to the metal flow in the molten pool, so the depth increases slightly.

Cangzhou Shenlong Pipe Manufacturing Co., Ltd. specializes in the production of straight seam submerged arc welding steel pipe, with a φ400-φ1422 straight seam double-sided submerged arc welding steel pipe production line, the company has an advanced physical and chemical laboratory, can undertake the physical and chemical testing of steel pipe. The company has obtained ISO9001 certification, CE certification, and API certification, the company's products are widely used in all kinds of oil and gas pipelines and construction steel structures, including oil pipelines, natural gas, urban pipe network, mine water, and coal pipeline, mine coal slurry pipeline, high voltage transmission line, wind power, bridge, high-speed railway steel structure building.