Union S 3 NiMoCr is a low-alloy, high strength submerged arc (SAW) wire. It goes into mobile equipment, machine frames, cranes and weight saving components.
The wire is used on mechanised stations, on butt welds in plate and circumferential welds on tanks. Its copper coated surface improves current pick-up in the contact tip and smooth feeding.
- Classification EN ISO: 26304-A SZ3Ni2.5CrMo
- AWS classification: A5.23 / SFA-5.23 EG [EF6 (mod.)]
- Shielding: flux matched to the wire, no shielding gas
- Diameters: 3.0 / 4.0 mm
Do not exceed the permitted interpass temperature, an overheated heat affected zone loses its toughness. 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. Match the diameter to the material thickness and the welding position.
