From 1989, USO produces high frequency (HF) welded mild steel galvanized, aluminized and also perforated tubes from Ø 32 mm to Ø 127 mm for exhaust pipes.

The induction welding (ERW) allows us to reach a high quality standard in sealing. Outside and inside of welded tubes, the weld seam is always removed. As for the aluminized and galvanized tubes we usually recoat the external weld-seam so that the outside surface is uniformly protected.