Union I Mo is a TIG rod for mild and low-alloy steels, including fine grained grades. It is used on steel structures, tanks, machine frames and workshop work on plain carbon steel.
Typical base materials are P235GH, P265GH, P295GH, S460N and ASTM A335. The rod suits root runs, thin walls and welds that need a smooth face.
- Classification EN ISO: W 46 3 W2Mo
- AWS classification: ER80S-G(A1)
- Diameters: 1.6 / 2.0 / 2.4 / 3.0 mm
On heavier sections and in a cold workshop plan the preheating, so that the risk of cold cracking stays down. Set the gas post-flow long enough for the pool and the electrode to cool under the shield. Grind the tungsten tip along its axis and hold a short arc, otherwise the pool spreads. Match the diameter to the plate thickness and the welding position, thinner rods are easier to control out of position. Clean rust, paint and grease out of the groove, contaminated plate gives porosity even with the parameters set correctly.
