BÖHLER C 9 MV-UP is a submerged arc (SAW) wire for welding creep-resistant CrMo steels. It is used on boilers, steam pipelines, refinery installations and parts working at elevated temperature.
The wire joins materials such as 1.4903 and ASTM A 335. It is used on boilers and pressure vessels under statutory inspection, and submerged arc welding gives a very high deposition rate on long, repeatable welds.
- Classification EN ISO: S S CrMo91 FB
- AWS classification: EB9
- Shielding: flux matched to the wire, no shielding gas
- Diameters: 2.5 / 3.0 mm
Do not interrupt welding and do not let the joint drop below the interpass temperature before the fill is finished. Keep an even flux layer over the arc, too thin a layer exposes the arc and too thick a one spoils the bead shape. Watch the wire stick-out and the position of the head against the weld centre line, under a flux you cannot see the pool and a mistake shows only after the slag is chipped off. Thinner diameters suit root runs, thicker ones suit filling.
