A high-frequency welded round tube is a round tube made by welding metallic materials (primarily steel plates) together using the resistive heat effect of high-frequency current.
In addition to being called a high-frequency welded round tube, it may also be referred to as a high-frequency straight-seam tube, an electrically welded straight-seam tube, a straight-seam tube, a high-frequency tube, a high-frequency welded pipe, or simply a round tube.
