In terms of welding process, the welding method of the spiral steel pipe and the straight seam steel pipe is consistent, but the straight seam steel pipes inevitably have a lot of b -welding seams. Therefore The stress is large, and the weld metal is often in a three -way stress state, increasing the possibility of cracking.
Spiral steel pipes and straight steel pipes are welded steel pipes. They are widely used in national production and construction. The spiral steel pipes and straight seam steel pipes have many differences because they are different. The difference.
The production process of straight seam steel pipes is relatively simple. The main production processes are high -frequency welding straight seam steel pipes and buried arc welding straight seam steel pipes. The production efficiency of straight seam pipes is high, low in cost, and rapid development.
When producing large -caliber straight seam steel pipes in the industry, the b -welding technology will be used. The short -sewing steel pipes in the short section of a short section will be connected to meet the length of the project. The welding residual stress at the seam is large, and the weld metal is often in a three -way stress state, increasing the possibility of cracking
The strength of the spiral steel pipe is generally higher than that of straight steel pipes. The main production process is buried arc welding. The spiral steel pipe can use different welded pipes with different billet production pipes with the same width, and can also use a narrower welding pipe with a larger diameter. 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.
In addition, according to the process of buried arc welding, each welding seam should be attached to the arc and extinguished arc. More welding defects. When the tube is underneath, it usually produces two main stress on the tube wall, namely radial stress and axial stress.
What is the difference between spiral steel pipes and straight steel pipes? Which one will be better? Generally, DN350 is above DN350, why should you use a spiral steel pipe without a straight sewing steel pipe?
Specifically, the spiral steel pipes and straight seam steel pipes are a weld form of welded pipes. The two are generally different. Because the welding seam is spiral, the pressure of the liquid will be distributed on all sides of the tube to enhance the strength of the pipe.
If a straight steel pipe is used, the general pipes are welded with steel plates. The larger steel plate required is greatly increased. Therefore, the spiral tube will be used with larger diameter. As for which one is good, because the scope of the two is different, you still need to choose the right steel pipe according to the needs.
