Submerged arc welding process
Submerged arc welding technology is an efficient welding technology, which is widely used in steel pipe production. The process first carries out strict physical and chemical inspection on raw materials to ensure that strip steel coils, welding wires and fluxes meet quality standards. Before forming, the strip steel is leveled, trimmed and planed, and the surface is cleaned, transported and pre-bent. Then, the strip steel is conveyed smoothly by the conveyor controlled by the electric contact pressure gauge, and is formed by external control or internal control roller. The weld gap control device ensures that the weld gap meets the welding requirements, and strictly controls the pipe diameter, offset and weld gap. For both internal welding and external welding, advanced electric welding machines are used for single-wire or double-wire submerged arc welding to obtain stable welding specifications. After welding is completed, the weld seam is inspected by online continuous ultrasonic automatic flaw detector to ensure 100% coverage of spiral weld nondestructive testing. If there is any defect, the system will automatically alarm and spray the mark, so that the production workers can adjust the process parameters in time and eliminate the defect. Finally, before each batch of steel pipes is put into production, it must go through a strict first inspection system to check the mechanical properties, chemical composition, melting condition, surface quality of steel pipes and nondestructive testing to ensure that the pipe-making process is qualified. This process not only ensures the stability of welding quality, but also improves the production efficiency, making it an indispensable and important material in modern industry. The production technology of submerged arc welding steel pipe is developing continuously, which has high automation, high welding speed and high output, and can weld steel pipes up to 30 meters per hour. These technical advantages and wide application fields make submerged arc welded steel pipe an indispensable and important material in modern industry.
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