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.

The welding process of seamless steel pipe includes: heating before welding, heat treatment after welding, quenching.

In addition to the skin effect, the proximity effect is another characteristic of current. When alternating currents of equal magnitude and opposite directions pass through two adjacent conductors, the current will flow through the adjacent inner surface layers of the two conductors, and when the two conductors pass When alternating currents of the same size and direction, the current will flow through the outer surface layers of the two conductors.

High-quality pipes are different, because such pipes have undergone some anti-oxidation treatments. This makes the surface of the pipe, with a protective film, looks very shiny.