How to operate the joint of thick-walled spiral steel pipe without wrong edge?

If the production process of thick-walled spiral steel pipes is unreasonable and the machine parameters are not set appropriately during the production process, deviation will occur, especially for large-diameter thick-walled spiral steel pipes. This is what people often call the misalignment phenomenon.

The treatment plan for thick-walled spiral steel pipes that have been misaligned after production is as follows:

1. Grind the wrong edge and then perform repair welding.
2. If the wrong side occurs frequently, the only option is to replace the equipment.

It is very necessary to analyze the reasons for the misalignment of thick-walled spiral steel pipes after they occur. The following are the common reasons for the misalignment.

1. The sickle bend of the steel strip is an important factor causing the misalignment of the steel pipe. In the forming of spiral welded pipes, the sickle bend of the steel strip will continue to turn into the forming angle, causing the weld gap to change, resulting in seams, misaligned edges and even overlapping edges.
2. When the weld reinforcement of the head-to-tail butt welding of the steel strip is large, if it is not handled properly during over-forming, it is easy to cause large misalignment.
3. Due to the poor shape and dimensional accuracy of the head and tail of the untrimmed steel strip, it is easy to cause the steel strip to bend hard and cause misalignment during docking.
4. The poor edge condition of the steel strip is another important reason for the wrong edge.

Therefore, observing the sickle bending situation after the steel strip coil is uncoiled, controlling the vertical roller so that the disc shear can cut off part of the sickle bend and the continuous control and correction of the forming angle are effective measures to reduce the misalignment of the steel strip sickle bending in the production process. .