In fact, spiral steel pipes and scaffold steel pipes are all welded steel pipes.
They are widely used in national production and construction, but spiral steel pipes and scaffold steel pipes have many differences because of different production processes.
The following discussion specifically discusses the difference between spiral steel pipe and scaffold steel pipe.
First, the strength of the spiral welded pipe is generally higher than that of the shelf pipe.
The main production process is submerged arc welding.
The spiral steel pipe can use the same width blank to produce welded pipes with different pipe diameters, such as large-diameter spiral steel pipes, and narrower blanks can also be used to produce pipe diameters.
Larger welded pipe.
However, compared with the same length of pipe, the weld length is increased by 30 to 100%, and the production speed is low.
Straight seam welded pipe production process is relatively simple, the main production process of high-frequency welding straight seam steel pipe and submerged arc welding scaffold steel pipe, scaffold steel production efficiency, low cost, rapid development.
Therefore, the smaller-caliber scaffold steel pipes mostly use straight seam welding, and the large-diameter welded pipes mostly use spiral welding. In the industry, large-diameter scaffolding steel pipe will use the T-welding technology, which will be followed by short-duration scaffolding steel pipe to meet the length required by the project, which greatly increases the probability of T-shaped welding scaffold steel pipe defects and T-welding
The welding residual stress at the seam is large, and the weld metal is often in a three-dimensional stress state, increasing the possibility of cracking.