Description
Gemini 309 — Product Information & Qualifications
Gemini 309 is a high-performance stainless steel electrode formulated for welding corrosion-resistant and heat-resistant chromium and chromium-nickel steels. It delivers a refined, smooth weld profile with clean edge formation, making it ideal for applications requiring strength, durability, and resistance to elevated temperatures.
With low spatter and exceptional slag removability, Gemini 309 ensures high welding efficiency and professional-grade finish quality, suitable for heavy-duty industrial, structural, and maintenance tasks.
Welding Positions
✔️ Flat (⎺)
✔️ Horizontal (→)
✔️ Vertical (│)
✔️ Overhead (∩)
Mechanical Properties
| Property | Value |
|---|---|
| Yield Stress | 410 N/mm² |
| Tensile Strength | 590 N/mm² |
| Elongation (%) | 35% |
| Charpy V-Notch (0°C) | – |
Chemical Composition (%)
| Element | % |
|---|---|
| Carbon | 0.05–0.08 |
| Manganese | 0.65 |
| Silicon | 0.53 |
Recommended Current Range (A)
Diameter: 2.0 mm
Flat / Horizontal / Fillet (F, HF, F): 30–50 A
Vertical Up / Overhead (VU, OH): 25–45 A
Diameter: 2.6 mm
Flat / Horizontal / Fillet (F, HF, F): 50–85 A
Vertical Up / Overhead (VU, OH): 45–80 A
Diameter: 3.2 mm
Flat / Horizontal / Fillet (F, HF, F): 90–115 A
Vertical Up / Overhead (VU, OH): 85–110 A
Diameter: 4.0 mm
Flat / Horizontal / Fillet (F, HF, F): 120–140 A
Vertical Up / Overhead (VU, OH): 115–135 A
Diameter: 5.0 mm
Flat / Horizontal / Fillet (F, HF, F): 150–180 A
Vertical Up / Overhead (VU, OH): –
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