Union X 70 is a solid MIG/MAG welding wire. It suits welding quenched and tempered high-strength steels in machine building, crane structures and commercial vehicles.
Typical parent materials are S620Q, S620QL, S690Q, S690QL and ASTM A 514. The wire runs by hand with a semiautomatic torch and on mechanised stations, on working machines, booms, cranes and structures that need a high yield strength.
- Classification EN ISO: 16834-A, G 69 5 M21 Mn3Ni1CrMo
- AWS classification: A5.28 / SFA-5.28, ER110S-G
- Diameters: 1.0 / 1.2 mm
Do not exceed the permitted interpass temperature, an overheated heat affected zone loses its toughness. 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.
