What's Cause to Misalignment on Large Diameter SSAW Steel Pipes

Large diameter SSAW steel pipe is a spiral steel pipe with a diameter greater than 1 meter. It is formed by bending steel strip and then welding. Steel pipes are subjected to water pressure, bending, flattening and other experiments. Usually the delivery length is 12 meters, or customized length.

In the production of large-diameter SSAW steel pipes, there are many influencing factors cause to misalignment. Steel pipes are degraded due to misalignment excessive tolerance. What is cause to misalignment how to prevent it?

Reasons of misalignment for large-diameter SSAW steel pipes:

1. The sickle bend of the steel belt is the main factor causing the misalignment of the steel pipe. In the forming of SSAW steel pipes, the sickle bend of the steel strip changed the forming angle continuously, resulting in the change of the weld gap, resulting in seams, staggered edges or even overlapping edges, which serious affected the quality of steel pipe. Therefore, pay attention to the sickle bend after uncoiling the steel strip, controlling the vertical roll, the disc shear can cut off part of the sickle bend and the continuous control and correction of the forming angle are to reduce the sickle bend of the steel strip during the production process.

2. Due to the poor shape and dimensional accuracy of the untrimmed steel strip head and tail, it is easy to cause the steel strip to bend hard and cause misalignment during butt joints.

3. When the reinforcement of the welding seam of the head and tail of the steel strip is large, if the over-forming is not handled properly, it is easy to cause a large wrong edge.

4. The poor condition of the edge of the steel strip is another important reason for misalignment.

Changsha Xiangjia Metal Materical Co., Ltd. is the leading manufacture in China, has been insisting on product quality as the center and inheriting quality for 18 years. If you need any steel pipes, we are your good choice.