Thermanit MTS 3-LNi is a low-alloy, creep resistant TIG rod. It works in power plant, on superheaters, headers and pressure pipework in chromium molybdenum steels.
Base materials are 1.4903 and 1.4955. The deposit resists creep at elevated temperature, and TIG gives you full control over the heat input and a clean, smooth weld.
- Classification EN ISO: 21952-A W CrMo 9 1
- AWS classification: A5.28 / SFA-5.28 ER90S-B91
- Shielding gas: I1
- Diameters: 0.5 / 2.0 / 2.4 / 3.2 mm
Do not interrupt welding and do not let the joint drop below the interpass temperature before the fill is finished. 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 material thickness and the welding position, thinner rods are easier to control out of position. Plan the preheating and the post weld heat treatment to the WPS for the grade in hand, CrMo steels harden in the heat affected zone.
