The main welding parameters of submerged arc welding are: welding current, arc voltage, welding speed, wire diameter and wire extension length. Welding materials for submerged arc welding include welding wire and flux, the selection of which should be based on the mechanical properties and chemical composition of the base material, bevel form, thickness, process conditions and structural dimensions. Low-alloy steel and low-carbon steel can be selected to match the strength of the steel wire and flux, but also to meet other standard requirements. Selection of carbon steel H08A, H08MnA wire, select high manganese and high silicon flux, or select H08MnA, H10Mn2 wire, matching the low ferocity and no manganese type flux.
Low-alloy high-strength steel should be used in low-alloy high-strength steel wire, in the selection of medium ferocious silicon or low manganese medium-sized smelting flux can also be used in the sintered flux.
Heat-resistant steel welding, should choose the composition and steel similar to welding. For the choice of flux, low-temperature heat-resistant steel and corrosion-resistant steel can be selected as alkaline medium-silicon or low-silicon type of agent, should be selected from high alkalinity alloy steel or sintered bonded welding and other high-alloyed steel, in order to reduce the alloying elements of the combustion of the alloying elements to increase more alloying elements. In addition, the influence of various technical factors should be considered.
The surface quality of the welding wire, such as diameter deviation, surface hardness, and curvature uniformity, affects the stability of the welding process and the quality of the weld. Therefore, the welding wire should be checked before loading and bending should be eliminated. It should be dried before use, and the flux particle size affects the permeability, which has a certain effect on the weld shaping and internal quality. In the case of constant flux size, if the welding current is increased, the arc will be unstable and the surface and edge of the weld will be uneven, the higher the current, the larger the flux particle size should be.
Welding speed has an effect on melt width and melt depth. Under other conditions unchanged, the welding speed decreases significantly with the increase of weld joint speed. The increase in the backward inclination of the arc favours the flow of metal in the molten pool, so that the depth increases slightly.
