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.