TYHI is the design and manufacture base of pipe welding equipment. Its production line includes intermittent and continuous whole mill unit, which can be made as one-step molding and two-step molding. The finishing mill unit can realize the layout of different processes according to API standard, finishing pipe end expansion, flattening and chamfering, hydraulic test and NDT.  Spiral pipe welding equipment with one step forming and pre-finishing welding forming meeting API standard.