 | ER309LSi Stainless Steel MIG Wire |
AWS: AWS A5.9 – ER309LSi
A low-carbon austenitic stainless steel solid welding wire designed for joining dissimilar steels and stainless steels. It provides smooth wire feeding, stable arc performance, low spatter and clean weld appearance, with good corrosion resistance and reliable mechanical properties.
Applications
• Petrochemical Equipment
• Dissimilar Steel Welding
• Pressure Vessels & Petrochemical Equipment
• Stainless Steel Fabrication
• Welding Stainless Steel to Carbon / Low-Alloy Steel
Features
• Good Corrosion Resistance
• Stable Arc
• Low Spatter
• Clean Weld Appearance
• Good Mechanical Properties
• All-Position Welding
Typical Chemical Composition (%)
C | Mn | Si | Cr | Ni | Mo | P | S | Cu |
≤0.03 | 1.0-2.5 | 0.30-0.65 | 23.0-25.0 | 12.0-14.0 | ≤0.75 | ≤0.03 | ≤0.03 | ≤0.75 |
AWS standard limits; single values shown with ≤ are maximum values.
Typical Mechanical Properties
Tensile Strength | Elongation | Shielding Gas | Gas Flow | Polarity |
585 MPa | 43% | 98% Ar + 2% O₂ | 20–25 L/min | DC+ |
Recommended Welding Parameters (DC+)
Wire Size | Flat / Horizontal Current | Voltage | Vertical-Up Current | Voltage | Overhead Current | Voltage |
0.8 mm | 70–150 A | 20–25 V | 50–120 A | 19–23 V | 50–120 A | 19–23 V |
1.0 mm | 100–200 A | 22–28 V | 80–150 A | 20–25 V | 80–150 A | 20–25 V |
1.2 mm | 140–220 A | 23–33 V | 120–180 A | 24–28 V | 160–200 A | 26–30 V |
Welding Position
Flat · Horizontal · Vertical-Up · Overhead
Welding Notes
• Clean rust, moisture, oil, dust and other contaminants from the weld area before welding.
• Recommended shielding gas: 98% Ar + 2% O₂; maintain a gas flow of approximately 20–25 L/min.
• Maintain a wire stick-out of approximately 15–25 mm and use suitable welding parameters.
• For outdoor welding, provide adequate wind protection when wind speed exceeds 1.5 m/s.
• Use controlled heat input and proper welding technique to maintain corrosion resistance and weld appearance.
