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
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.