Submerged arc welded steel pipe: advantages and disadvantages analysis and industry focus
In the field of steel pipe manufacturing, submerged arc welding steel pipe occupies an important position with its unique process and performance characteristics. As a member of the industry, Hebei Huayang Steel Pipe Co., Ltd. has rich experience and outstanding performance in the production and application of submerged arc welded steel pipes. Today, we will discuss the advantages and disadvantages of submerged arc welded steel pipes.
Advantages of submerged arc welded steel pipe
High weld quality
During submerged arc welding, the arc is covered by granular flux and its slag, and the arc and molten pool are in good slag phase protection, which makes the welding process less disturbed by external factors, greatly reduces the dependence on the welder's operation skills, and the chemical composition and mechanical properties of the weld are more stable, which can effectively guarantee the safety and reliability of the pipeline, and has obvious advantages in the field of high-pressure transportation such as oil and natural gas.
High production efficiency
From the point of conducting mode, the current is introduced into the welding wire from the conducting nozzle, and the length of the conducting welding wire is short and stable, and there is no limitation of covered electrode coating being decomposed by heat. Therefore, the welding current and current density of submerged arc welding are obviously improved compared with manual arc welding, and its arc power, penetration ability and melting rate of welding wire are correspondingly increased. Even under certain conditions, a 10-20mm steel plate can be formed by once penetration, and the highest welding speed can reach 60-150m/h, which is suitable for mass production.
Strong raw material adaptability and production flexibility
Spiral submerged arc welding can use narrow steel strip to produce large diameter welded pipes, and can also produce welded pipes with different wall thicknesses according to the demand, which meets the diversified engineering construction needs. Longitudinal submerged arc welding plays an important role in pipeline construction with high pressure and high strength requirements by pre-bending the edge of steel plate and then rolling it into a tubular welding, which has high dimensional accuracy of steel pipe and good surface quality of internal and external walls.
Good working conditions
Submerged arc welding has no arc radiation, and the welder is mainly responsible for operating the welder, which makes submerged arc automatic welding one of the arc welding methods with ideal operating conditions and improves the working environment of workers.
Disadvantages of submerged arc welded steel pipe
Limited welding position
Submerged arc welding needs to rely on granular flux to cover the arc to form protective conditions. At present, it is mainly suitable for horizontal welding. Although vertical welding and horizontal welding have been studied, the effect is not good and they have not been widely used, which limits their application in complex construction environment to some extent.
Limited welding materials
The main components of flux are MnO, SiO2 _ 2 and other metals and nonmetallic oxides, which makes it difficult for submerged arc welding to weld metals and their alloys with strong oxidation, such as aluminum and magnesium, and its application scope is limited to some extent.
Weld length and welding limitation of thin plate
It is only suitable for long seam welding, and its productivity is not as good as manual arc welding for short seam. Moreover, due to the chemical composition of flux, the arc column potential gradient of submerged arc welding is large, and the arc stability is poor when the current is less than 100A, so it is not suitable for welding thin plates with a thickness of less than 1 mm.
Facing the advantages and disadvantages of submerged arc welded steel pipes, Hebei Huayang Steel Pipe Co., Ltd. gives full play to its advantages, continuously optimizes production technology and improves product quality. In oil and gas pipelines and other projects, with the high-quality weld seam and high production efficiency of submerged arc welded steel pipes, reliable pipe support is provided for various projects. At the same time, we are actively exploring the improvement scheme to overcome its shortcomings and further expand the application field of submerged arc welded steel pipes. It is believed that with the continuous progress of technology, submerged arc welded steel pipes will play a greater role in future industrial construction.
