Key Welding Precautions for S355J0WP Weathering Steel
Preheat & Interpass Temperature
Preheat to 100–150°C (thickness-dependent) to prevent hydrogen-induced cracking.
Maintain interpass temps ≤250°C to avoid excessive softening.
Filler Metal Selection
Use weathering-resistant fillers (e.g., AWS E7018-W, ER70S-3 with Cu/Cr).
Avoid mismatched fillers that compromise corrosion resistance.
Low-Hydrogen Practices
Bake electrodes (350–400°C) to remove moisture.
Shield welds from humidity (use MIG/GTAW with dry gas).
Heat Input Control
Limit to 0.5–2.0 kJ/mm to prevent Cu segregation and porosity.
Avoid prolonged arc time on thin sections.
Post-Weld Considerations
Clean slag/spatter to ensure uniform patina formation.
Skip PWHT unless required for stress relief (thick sections).
Joint Design & Testing
Bevel thick plates (e.g., 60° V-groove) for full penetration.
Verify weld integrity via UT/PT and corrosion testing.
