Pipe shaping and continuous tack-welding
During the first step of the two-step process, the hot wide strip passes through a forming machine to be shaped to a pipe. The resulting pipe diameter depends on the strip width and on the run-in angle of the strip into the forming machine.
The forming unit consists of a three-roll bending system with external roll cage. In the run-in section, the starting material is subjected to ultrasonic testing for laminations over its entire width. After forming, the strip edges of the shaped pipe are joined by MAG tack-welding.
In the run-out section, the continuous pipe string produced in this way is cut to the specified lengths by a flying plasma burner.