The Advantages Of Large-diameter Submerged Arc Welded Steel P

 Common submerged arc welded steel pipes mainly include lsaw steel pipes and ssaw steel pipes. The first advantage of large diameter submerged arc welded steel pipes is that they are fully automated; the second advantage is that they are welded under the submerged arc. Therefore, its heat exchange and protection performance is relatively strong, and the quality of welding is relatively high. The third advantage is that since the arc is buried under the flux under the automatic welding of the submerged arc, it can use a large current and the welding efficiency is relatively high. Recently, we have The West-East Gas Pipeline Project underway in the country.

Submerged arc welding of large diameter steel pipes is a method in which an electric arc is burned under the flux layer for welding. Its inherent welding quality is stable, welding productivity is high, there is no arc and smoke, and so on, making it the main welding method in the production of important steel structures such as pressure vessels, pipe segments, box beams and columns. 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.

The second advantage is that after the wire is changed into a wire, the wire is continuously fed to the wire by means of a wire feeding device and a wire spool. The welding method is a continuous feeding wire which ignites the arc under the cover of the meltable granular flux. A part of the welding wire, the base material and the flux are melted and evaporated to form a cavity, and the arc is stably burned in the cavity, so it is called submerged arc automatic welding. The arc is buried in the cavity.

Large-diameter submerged arc welded steel pipes are currently mainly used for welding various steel plate structures. Weldable steel grades include carbon structural steel, stainless steel, heat resistant steel and composite steel. Submerged arc welding is the most widely used in shipbuilding, boilers, chemical containers, bridges, lifting machinery, metallurgical machinery manufacturing, marine structures, and nuclear power equipment. In addition, it is also desirable to use a submerged arc welding to weld a wear-resistant corrosion-resistant alloy or to weld a nickel-based alloy.

Common welding wires and fluxes have the same effect as welding electrode cores and electrode strips for manual arc welding. Welding different materials should choose different components of the wire and flux. For example, H08A welding wire is commonly used when welding low carbon steel, and high manganese and high silicon type flux HJ431 is used. Welding power supplies usually use a larger capacity arc welding transformer.