Welding on Corten steel is relatively similar to low-carbon steel. The only precaution the welders need to take is regarding the filler or electrode, which is different from mild steel.

When welding Corten steel, it’s critical to select the right electrode that preserves the base metal’s corrosion-resistant properties.

Choosing the Right Electrode for Weathering Steel

When choosing a welding electrode for weathering steel, AWS E7018 is most suitable. The choice of electrode depends on two factors: required strength and code requirements.

• Recommended Electrode: AWS E7018

• Why: It maintains joint strength and matches the patina’s corrosion behavior.

At GNEE, we recommend Lotherme 7018 and similar low-hydrogen electrodes to ensure the best results.

Best Welding Techniques for Corten Steel

When it comes to welding Corten steel, the method should match the material thickness and end-use.

1. Stick Welding (SMAW)

Reliable and economical for structural joints. This is often the go-to method for heavy-duty structural work.

2. TIG Welding (GTAW)

Clean and precise, suitable for fine applications where aesthetics and detail are paramount.

3. MIG Welding Corten Steel (GMAW)

Fast and efficient for thin sheets. For MIG welding corten steel, shielding gases like CO₂ and Ar-CO₂ mixtures help ensure smoother arcs and less spatter while using weathering steel-compatible filler wire.

Common Challenges When Welding Corten Steel

Despite its benefits, welding corten steel comes with some challenges that welders must be aware of:

• Heat-induced distortion or cracking.

• Loss of corrosion resistance near the heat-affected zone.

• Difficulty in matching the patina formation post-weld.

However, with the right expertise and materials, these can be addressed. The necessary knowledge and experience in welding already exist. Hence, welders should be able to use it without any hassles.

Post-Weld Treatment and Maintenance Tips

To retain the steel’s integrity and look, proper post-weld care is essential:

• Clean the weld area to remove slag and spatter.

• Use weathering accelerators to match the patina faster if immediate aesthetic blending is required.

• Avoid stagnant water and ensure drainage in structural designs to prevent premature corrosion.

This ensures that the weathering finish evolves consistently across welded and unwelded sections.

Why Choose Weathering Steel?

Corten steel is preferred across industries thanks to its durability, unique appearance, and natural corrosion resistance. While it may cost more upfront, its minimal maintenance and extended life make it a smart long-term investment.

Whether used in buildings, bridges, or public art, weathering steel delivers strength and style. When it comes to welding corten steel, especially using techniques like MIG welding, selecting the right electrode is key to maintaining its structural and visual integrity.

With GNEE’s expertise in welding corten steel, you can count on reliable performance and lasting results in every application.

Key Takeaways

• Durability and Corrosion Resistance: Patina shields the surface from deeper corrosion.

• Aesthetic Appeal: Orangish-brown finish integrates beautifully into various environments.

• Wide Applications: Ideal for engineering, construction, public art, and outdoor design.

• Cost Considerations: Though costlier, it offers long-term value through reduced maintenance.

• Welding Insight: Similar to mild steel but requires compatible electrodes like AWS E7018 for reliable performance.