Union ER 90S-B3 is a low-alloyed, creep resistant solid wire. It suits welding CrMo steels in boiler, pressure vessel and petrochemical plant construction.
Among the parent materials it covers ASTMA 182, ASTMA 213, ASTMA 234, ASTMA 335, 1.7380, 10CrMo9-10 and ASTMA 217. The wire goes on boilers and pressure vessels under technical inspection, with a deposit that stands up to creep.
- Classification EN ISO: 21952-A G CrMo2
- AWS classification: A5.28 / SFA-5.28 ER90S-B3
- Shielding gas: M2
- Diameters: 0.9 / 1.14 / 1.2 mm
Plan the preheating and the post weld heat treatment to the WPS for the grade in hand, CrMo steels harden in the heat affected zone. Set the gas flow so the pool is covered over the whole length of the bead, and shield the station when you work in wind. Check the contact tip, a worn bore upsets the wire feed and causes burnback. Match the diameter to the thickness and the position, thinner wires are easier to control in constrained positions.
