Straight seam steel pipe and spiral steel pipe are one kind of welded steel pipe. They are widely used in national production and construction. Straight seam steel pipe and spiral steel pipe have many differences due to different production processes. The following will discuss the straight seam steel pipe and spiral steel pipe in detail. The difference. The production process of straight seam welded pipe is relatively simple. The main production processes are high frequency welded straight seam steel pipe and submerged arc welded straight seam steel pipe. The production of straight seam pipe is high, the cost is low, and the development is fast.
The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. The main production process is submerged arc welding. Spiral steel pipes can be used to produce welded pipes with different diameters from blanks of the same width, and narrower blanks can be used to produce welded pipes with larger diameters. However, compared with the straight seam pipe of the same length, the weld seam length is increased by 30 to 100%, and the production speed is lower.
Therefore, the smaller-diameter welded pipes are mostly straight seam welded, and the large-diameter welded pipes are mostly spiral welded. T-welding technology is used in the production of larger diameter straight seam steel pipes in the industry. That is, the short straight seam steel pipes are short butt jointed to meet the length required by the project. The welding residual stress at the seam is relatively large, and the weld metal is often in a three-way stress state, which increases the possibility of cracks.