ER309L Stainless Steel TIG Welding Filler Rod
ER309L 36 inch TIG Welding Filler Rod
ER309L Stainless Steel TIG Rod bundle

ER309L x 36" Stainless Steel TIG Welding Filler Rod

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ER309L Stainless Steel TIG Welding Filler Rod is a high-chromium, low-carbon austenitic stainless steel filler rod engineered for dissimilar-metal joints and corrosion-resistant TIG (GTAW) welds. Supplied as straightened 36" (914 mm) cut lengths in 1/16", 3/32", and 1/8" diameters and 1, 2, 5, and 10 lb packs, it is the standard choice for joining stainless steel to carbon or low-alloy steel and for first-layer overlay on carbon steel. Select your diameter and pack size above.

Key Features

  • › High Cr/Ni (23.5% Cr / 13.5% Ni) deposit ideal for dissimilar-metal joints
  • › Low-carbon (≤0.03% C) chemistry resists carbide precipitation and intergranular corrosion
  • › Excellent crack resistance when welding stainless to carbon or low-alloy steel
  • › Smooth, stable arc with a bright, clean weld deposit
  • › Straightened 36" cut lengths for consistent, easy handling

Ideal Applications

  • › Joining 309/309L and dissimilar stainless-to-carbon steel joints
  • › First-layer (buffer) overlay and cladding on carbon steel
  • › Welding 304/304L where extra ferrite is beneficial
  • › High-temperature service and heat-resistant fabrication
  • › General stainless steel fabrication and repair

Technical Specifications

AWS Classification AWS A5.9 / A5.9M ER309L
Tensile Strength 75,000 psi (520 MPa) minimum
Rod Type Solid austenitic stainless steel (23.5% Cr / 13.5% Ni, ≤0.03% C)
Cut Length 36" (914 mm)
Process TIG (GTAW)
Polarity DCEN (straight polarity)
Shielding Gas 100% Argon
Available Packs 1 lb & 2 lb tubes; 5 lb & 10 lb boxes

Typical Chemical Composition

Typical filler-wire analysis (wt %). Single values are maximums; iron is the balance.

Element Typical Wire (wt %)
Carbon (C) 0.03 max
Chromium (Cr) 23.0 – 25.0 (typ. 24.0)
Nickel (Ni) 12.0 – 14.0 (typ. 13.0)
Manganese (Mn) 1.0 – 2.5 (typ. 1.8)
Silicon (Si) 0.30 – 0.65 (typ. 0.45)
Molybdenum (Mo) 0.75 max
Phosphorus (P) 0.03 max
Sulfur (S) 0.03 max
Copper (Cu) 0.75 max
Iron (Fe) Balance

Mechanical Properties

Typical as-welded all-weld-metal properties; values meet or exceed AWS A5.9 minimums.

Tensile Strength typ. 88,000 psi (605 MPa)
Yield Strength (0.2% offset) typ. 60,000 psi (415 MPa)
Elongation (2 in / 50 mm) typ. 38%
Ferrite Number (FN) 8 – 15 typical

Available Sizes & Recommended Amperage

Diameter Recommended Amperage
1/16" (1.6 mm) × 36" 70 – 110 A
3/32" (2.4 mm) × 36" 100 – 160 A
1/8" (3.2 mm) × 36" 120 – 210 A

Recommended amperage ranges are general guidelines; optimal settings vary with base-metal thickness, joint design, tungsten selection, and welding position. Store filler rod in a dry location to prevent oxidation and ensure clean welds.

⚠ WARNING: This product and the fumes and gases produced when welding it can expose you to chemicals including nickel and hexavalent chromium compounds, which are known to the State of California to cause cancer, and manganese, which is known to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.