UTP UP 776 is a solid submerged arc wire in a nickel alloy of the NiCrMo-4 type, for corrosion resistant NiCrMo alloys of the C276 group. It works on boiler components, furnace parts, chemical installations and heat exchangers exposed to aggressive media.
The wire works as a set with a matched flux, which decides the mechanical properties of the weld. It is used on mechanised stations, on butt welds in plate and circumferential welds on tanks.
- Classification EN ISO: 18274 S Ni 6276 (NiCr15Mo16Fe6W4)
- AWS classification: A5.14 / SFA-5.14 ERNiCrMo-4
- Shielding: flux matched to the wire, no shielding gas
Keep the interpass temperature low and limit weaving, nickel is prone to hot cracking. 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. Degrease the joint first, sulphur and lead residues cause hot cracking in nickel.
