Thermanit 25/14 E-309L is a submerged arc (SAW) wire for welding stainless and acid-resistant steels. Typical work covers tanks, process installations, food and chemical industry equipment and structures in contact with water and steam.
The base material is S500N. Submerged arc welding gives a very high deposition rate on long, repeatable welds.
- Classification EN ISO: S 23 12 L
- AWS classification: ER309L
- Shielding: flux matched to the wire, no shielding gas
- Diameters: 2.4 / 3.2 / 4.0 mm
Use brushes and discs kept only for stainless steel, carbon steel particles cause rust staining on the bead face. Match the flux to this wire and check how dry it is, drying the flux decides the hydrogen level in the weld. Keep an even flux layer over the arc, too thin a layer exposes the arc and too thick a one spoils the bead shape. Match the diameter to the material thickness and the welding position.
