Avesta 318-Si/SKNb-Si is a solid MIG/MAG wire for welding stainless and acid-resistant steels. It works on pressure vessels, process piping and austenitic structures where corrosion resistance counts.
The wire suits hand work with a semiautomatic torch and mechanised stations, fed continuously under shielding gas.
- Classification EN ISO: G 19 12 3 Nb Si
Keep the heat input down and do not hold the joint hot longer than needed, austenite expands strongly and pulls the structure out of shape. 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. After welding remove the heat tint by pickling or brushing, the oxide layer alone lowers the corrosion resistance of the joint.
