Straight seam steel pipes can be divided into high-frequency straight seam steel pipes and submerged arc welded straight seam steel pipes according to the production process.

The submerged arc welding process is suitable for the requirements of heavy industrial applications such as pipelines, pressure vessels and tanks, locomotive manufacturing, heavy construction, and excavation.

If the cold treatment method selected for seamless steel pipes is not correct, its performance will be affected to a certain extent. Therefore, preventive measures must be taken during the cold treatment process.

In the actual production process, these three welding forms are often intertwined. However, the solid-melt welding form is more favored by operators and used more frequently.

Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Generally divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc.

Welding thermal cycle refers to the process that the temperature of a certain point on the edge of the tube changes over time under the action of the heat source generated by the high-frequency welding current.