Home > Electrodes > 309LMo MIG & TIG Filler Welding Wire & Rod
Here’s a detailed look at **309LMo MIG and TIG filler welding wire/rod** — we’ll explore what it is, its composition and mechanical properties, as well as its typical applications. This information can be handy for documentation or when providing overviews for suppliers or products:
309LMo MIG and TIG filler metal is a high-alloy austenitic stainless-steel filler designed for welding stainless steels (like 309 and 316 types or Mo-alloyed stainless) to carbon, mild, or low-alloy steels. It’s also great for cladding or overlay applications where you need corrosion resistance and strong weld integrity. It works beautifully in both MIG (GMAW) and TIG (GTAW) processes under inert-gas shielding, delivering a stable arc, smooth weld deposits, and impressive slag/weld-bead quality.
| Classification | AWS A5.9, 309LMo |
| Form | MIG spools, TIG cut lengths, Reels and Coils |
| Type Of Welding | Inert Gas Welding |
| Current | MIG-DCEP / TIG-DCEN |
| Diameters | .023”, .030”, .035”, .045”, 1/16”, 3/32”, 1/8” |
| Standard TIG straight lengths are available | 36” (914 mm) or 39” (1000 mm) lengths. Other lengths available upon request. |
| AWS 309LMo MIG & TIG Filler Metal Application & uses |
|
| C | Mn | Si | Cr | Ni | S | P | Mo | Cu |
| 0.03 max | 1.0-2.5 | 0.30-0.65 | 23-25 | 12-14 | 0.03 max | 0.03 max | 2-3 | 0.75 max |
| Tensile Strength (psi) | 86,000 psi (593 MPa) |
|---|---|
| Yield Strength (psi) | 57,000 psi (393 MPa) |
| Elongation (%) | 42% |
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Alloy 309LMo MIG filler wire provides excellent corrosion resistance and high-temperature strength, suitable for welding in harsh environments like chemical processing and power generation.
Alloy 309LMo TIG filler wire offers superior resistance to pitting and crevice corrosion, ideal for high-temperature applications and joining dissimilar metals in challenging environments.
Alloy 309LMo TIG filler rod delivers robust corrosion resistance and strength, perfect for precision welding in harsh conditions, including chemical processing, petrochemical, and power generation industries.
We conduct extensive in-house testing to ensure that the highest quality standards are achieved by 309L Mo MIG and TIG Filler Welding Wires and Rods. Our customers know that we offer comprehensive third-party inspection services for these products to provide them with the assurance that these products are reliable and performing. We equally hold equal attention with regard to the timely supply of products for which you can place your orders in advance thus enabling you to also plan efficiently the other components of your project.
The typical chemistry of 309LMo filler includes about 23-25% chromium (Cr), 12-14% nickel (Ni), and 2-3% molybdenum (Mo), with very low carbon content (≤ 0.03%) to reduce carbide precipitation and maintain corrosion resistance. You might also find small amounts of manganese (Mn) and silicon (Si) depending on the specifications. The weld deposits usually achieve tensile strengths between 550-620 MPa, with yield strengths around 350-400 MPa (this can vary based on the rod/wire and process), and elongation often reaches 30-35% or more, ensuring good ductility and toughness. Plus, the weld metal shows excellent impact resistance and keeps its corrosion resistance in environments rich in chlorides or chemicals, thanks to the molybdenum.
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