Helical two-step process

Back in 1986, we were the first manufacturer to use the helical two-step (HTS) process, and we have been continuously improving it ever since.

The big difference to conventional helical welding is the separation of the process into two steps:

Pipe shaping and continuous tack-welding

External and internal submerged-arc welding
on separate stands

The advantages of HTS technology

  •  Production steps similar to longitudinally welded pipe production
    • Up to 100 % ultrasonic testing of the hot wide strip before pipe forming
    • Strip edges are trimmed and milled
    • Strip edge is crimped before pipe forming
  • High process efficiency
    Pipe shaping and tack-welding at 15 m/min makes for high productivity
  • Minimum defect rate
    No submerged-arc welding defects thanks to continuous pipe forming without start-stop interruptions.

In addition, there is no restriction to standard diameters, because the HTS welding process allows pipe inside and outside diameters to be tailored to individual requirements.



Björn Ehlers
Plant Manager

Phone: +49 5341 21-4879
Fax: +49 5341 21-7813