Product Description
GTW Supplies ER70S-6 TIG Welding Rod – High-Silicon, High-Strength Performance for Dirty or Oily Steel
GTW Supplies ER70S-6 is a premium TIG welding rod designed for mild steel applications where surface conditions are less than ideal. Formulated with higher levels of manganese and silicon than other mild steel grades, ER70S-6 provides a stable arc, smooth bead appearance, and superior weld fluidity—even on rusty, oily, or poorly fitted steel.
Engineered to produce x-ray quality, porosity-free welds, this rod delivers the highest as-welded tensile strength of all plain carbon steel fillers. It’s the go-to choice for general fabrication, construction work, home projects, and salvage welding of steel castings and forgings. The high silicon content improves wetting action, which minimizes post-weld cleanup and grinding.
Key Features:
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High-manganese, high-silicon formulation for welding contaminated or poor-fit materials
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Delivers strong, smooth, and consistent TIG welds with excellent puddle control
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Ideal for welding rusty, oily, or lightly scaled mild steel
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Produces minimal spatter and clean bead finish
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Suitable for structural applications requiring high weld integrity
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Runs on 100% Argon shielding gas, polarity DCEP
Mechanical Properties:
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Tensile Strength: 70,000 psi
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Yield Strength: 58,000 psi
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Elongation in 2": 22%
Typical Wire Chemistry (AWS A5.18 ER70S-6):
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C: 0.06–0.15 | Mn: 1.40–1.85 | Si: 0.80–1.15
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P: ≤ 0.025 | S: ≤ 0.035 | Ni, Cr, Mo, Cu: ≤ 0.15 each
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V: ≤ 0.03
Recommended TIG Welding Parameters (100% Argon):
| Diameter | Amps |
|---|---|
| .035" (0.9mm) | 60–100 A |
| .045" (1.14mm) | 70–120 A |
| 1/16" (1.6mm) | 100–160 A |
| 3/32" (2.4mm) | 120–250 A |
| 1/8" (3.2mm) | 150–300 A |
Typical Applications:
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Fabrication and repair of dirty, rusty, or oily mild steel
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Sheet metal, tanks, steel framing, and home projects
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Salvage welding of steel castings and forgings
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General construction and field repair jobs
Why Welders Prefer GTW Supplies ER70S-6 TIG Rods:
When surface prep is limited and reliability is critical, GTW’s ER70S-6 delivers outstanding results. Trusted for its forgiving performance and consistent weld quality, it's a shop and field favorite for mild steel TIG welding.
