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Thermanit 309L Mo solid MIG/MAG wire: Böhler Welding wire on a BS300 spool, uncoppered
Thermanit, solid MIG/MAG wire, stainless and acid-resistant steels

Thermanit 309L Mo solid MIG/MAG wire

EN ISO classification14343-A G 23 12 2 L
AWS classificationA5.9 / SFA-5.9, ER309LMo(mod.)
Shielding gasM12: Ar with CO2 added (up to 5 %), M13: Ar with O2 added (up to 3 %)
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Authorised distributorvoestalpine Böhler Welding
Courier shippingfrom the warehouse in Krotoszyn
Data sheetcomposition, properties, specifications
Wire selectionhelp from a welding engineer
Manufacturer data sheet
Application Specifications Manufacturer datasheet Fits Substitute Bought together
Application

What Thermanit 309L Mo solid MIG/MAG wire is used for

Thermanit 309L Mo is a high-alloyed solid wire for special applications. It suits welding stainless and acid-resistant steels on tanks, process plant, food and chemical equipment and structures in contact with water and steam.

The wire suits hand work with a semiautomatic torch and mechanised stations, and it also serves for cladding runs on steel.

  • Classification EN ISO: 14343-A G 23 12 2 L
  • AWS classification: A5.9 / SFA-5.9 ER309LMo(mod.)
  • Shielding gas: M12, M13
  • Diameters: 0.8 / 1.0 / 1.2 mm

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. Check the contact tip, a worn bore upsets the wire feed and causes burnback. Match the drive rolls to the wire diameter and check the liner, wire slip shows up at once in an unstable arc.

Manufacturer datasheet

Chemical composition and properties from the manufacturer datasheet

Datasheet PDF

Typical weld metal values from the voestalpine Böhler Welding data sheet, issue 08/2024. The minimum or the range guaranteed by the maker is given in brackets. The figures depend on the heat treatment condition and the shielding gas stated in the row and do not replace testing the joint to your own WPS.

Welding data and approvals
Shielding gas to EN ISO 14175M1
Datasheet edition08/2024
Mechanical properties of the all-weld metal, typical values
Condition Yield strength Re, MPa Tensile strength Rm, MPa Elongation A, % Impact energy KV, J at 20 °C Impact energy KV, J at -40 °C
u 390 (min. 350) 610 (min. 550) 32 (min. 30) 75 (min. 60) 60 (min. 47)
Fits

For which materials and machines

Base materials

Material group: stainless and acid-resistant steels. The exact grades and thicknesses are in the manufacturer data sheet, and for an unusual joint call us, we will pick the filler metal.

Process and machines

Solid MIG/MAG wire, works on any sound machine for this process: welders. Shielding gas: M12: Ar with CO2 added (up to 5 %), M13: Ar with O2 added (up to 3 %).

Used welders New welders Ask us to help you choose
Technical substitute

A substitute for this consumable

We will find a substitute with the same classification, diameter and shielding gas over the phone: +48 669 162 833.

From the same group

Other consumables for the same material

For comparison before you buy. A technical substitute is listed above.

All: Solid MIG/MAG wires