When welding S355J2WP weathering steel, the recommended welding rods (electrodes) should match its corrosion-resistant and mechanical properties. Here's a concise guide:
Recommended Welding Electrodes
For SMAW (Shielded Metal Arc Welding):
E7018-W2 (e.g., AWS A5.1/A5.5):
Contains Cu, Cr, Ni to match weathering steel's alloy composition.
Provides good toughness and crack resistance.
Specialized Weathering Electrodes:
Böhler Fox EV 65 (1.5%Ni, 0.3%Cu) or Lincoln ConArc 70C1N.
For GMAW (MIG/MAG Welding):
ER70S-6 (AWS A5.18) with Ar+CO₂ gas mix (for general use).
Weathering-Specific Wires:
G 89 Mn4Ni1.5CrMo (e.g., Oerlikon OPRA 6 W).
For FCAW (Flux-Cored Arc Welding):
E71T-1C (AWS A5.20) with Cu/Ni additives (e.g., Hobart FabCO 71W).
Key Considerations
Preheating: 100–150°C (for thicknesses >15 mm to avoid hydrogen cracking).
Post-Weld Cleaning: Remove slag to ensure patina formation.
Matching Patina: Use electrodes with Cu/Cr to maintain uniform rust appearance.
