Home > Electrodes > AWS Class ER309LSi Mig & Tig Filler Welding Wire & Rod
ER309LSi is a type of stainless steel filler metal that falls under AWS A5.9 / ASME SFA‑5.9 (UNS S30988). It shares a similar base composition with ER309L but boasts a *higher silicon* content (around **0.65‑1.00 % Si**) to enhance wetting and fluidity in the weld pool. ([Weld Wire][1]) Other important alloying elements include: Carbon ≤ 0.03 %, Chromium ~ 23‑25 %, Nickel ~ 12‑14 %, Manganese ~1.0‑2.5 %, with trace limits on Phosphorus and Sulfur. Molybdenum (Mo) and Copper (Cu) are either optional or limited (≤ ~0.75 %) in most specifications. ([Weld Wire][1])
**Mechanical Properties** The as-welded ER309LSi weld metal shows impressive strength and ductility. Here are some typical mechanical values: * Yield strength is around **~ 60,500 psi** (~ 417 MPa) ([Weld Wire][1]) * Tensile strength hovers around **~ 89,000 psi** (~ 614 MPa) ([Weld Wire][1]) * Elongation (A%) is typically about **35‑40 %** ([Weld Wire][1]) * A good reduction of area (~ 60 %) has also been noted in some data sets. ([Weld Wire][1])
| Classification | AWS A5.9, ER309LSi |
| 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 ER309LSi MIG & TIG Filler Metal Application & uses |
|
| C | Cr | Ni | Mo | Mn | Si | P | S | Cu |
| 0.12 | 24.0-26.0 | 13.0-15.0 | 0.75 | 1.0-2.5 | 0.65-1.00 | 0.03 | 0.03 | 0.75 |
| Yield, kpsi: | 564 |
| Tensile Strength, kpsi: | 87 |
| Elongation%, min: | 41 |
Contact us to get a quick quote for your requirement.
Stainless Steel ER309LSi MIG Filler Wire offers high-quality, silicon-enhanced welds for dissimilar metals, providing excellent corrosion resistance and bead appearance in applications like power generation and industrial fabrication.
Stainless Steel ER309LSi TIG Filler Wire delivers superior weld quality and corrosion resistance for dissimilar metal joints, ideal for high-temperature and critical applications in industries such as petrochemical and structural fabrication.
Stainless Steel ER309LSi TIG Filler Rod ensures strong, corrosion-resistant welds with enhanced fluidity for dissimilar metals, suitable for high-stress applications in power generation, chemical processing, and industrial sectors.
After the production of our AWS Class ER309LSi MIG and TIG Filler Welding Wire and Rod, our quality control team conducts thorough destructive and non-destructive testing using advanced equipment to ensure the superior performance and reliability of the product. Once the testing is complete we carefully package the filler wire and rod using appropriate materials to maintain their quality during shipping. We assure smooth and timely delivery to our customers. Guaranteeing on-time arrival without any delays. All necessary documentation, including certificates and test reports, are provided to the clients upon delivery.
ER309LSi is particularly effective for welding similar types of austenitic stainless steels (like 304 and 347) and for joining stainless steel to carbon or low-alloy steels (dissimilar joints). This is especially true in situations where a nice weld bead appearance and good wetting are crucial. ([Hindustan Inox][2]) The increased silicon content contributes to smoother welds, better flow, and an improved surface finish. It’s commonly used for buffer layers in overlay welding, for joining components that face moderate corrosion and high temperatures, and for applications where a stable weld pool and clean bead appearance are key. ([Betaweld][3])
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