The strength of the spiral tube is generally higher than that of the straight seam welded pipe. It can use a welded pipe with a larger diameter of the billet material, and can also use the same width to produce a tube with different welded pipes with different billet production pipes. However, compared with the same length of the same length, the length of the weld is increased by 30 ~ 100%, and the production speed is lower. Therefore, most of the smaller -caliber welded pipes are welded with straight seams, and most of the large -caliber welded pipes are mostly spiral welded.
1. Real seam high -frequency welding steel pipe
High -frequency welding principle: After the hot -rolled curly plate is formed by forming, the skin collection effect and adjacent effect of high -frequency current are used to heat the edges of the tube billet, and pressure welding is performed under the action of the squeeze roller to achieve production steel pipes.
High -frequency welded steel pipe characteristics: The inside and outside the welds of the ERW welded pipes are scraped to the mother material. The geometric size is high, the concentricity is high, the wall thickness is uniform, the welding is uniform after the heat treatment of the heat, and the seamless steel pipe is high as high as the seamless steel pipe. Anti -squeezing ability.
2. The spiral angle of the welding of the spiral welding pipe is generally 50-75 degrees, which means that the synthetic stress at the spiral weld is 60-85%of the main stress of the straight seam. This means that the spiral tube can be smaller than the wall of the straight seam welded pipes when the same working pressure. This feature not only reduces the cost of manufacturing, but also reduces energy consumption and environmental pollution. In addition, the spiral steel pipe also has the advantages of high production efficiency, low cost, and flexible specifications, so that it has been widely used in many fields.
