SMAW on Aluminum, Stainless Steel and Cast Iron

1. SMAW on Aluminum

• Overview: Lightweight, highly conductive; difficult to weld due to oxide layer.

• Electrodes: 4043, 5356 (AC).

• Key Points: AC current needed, preheat thick sections, avoid excessive heat to prevent burn-through.

• Applications: Repairs and maintenance when TIG is not available.

2. SMAW on Stainless Steel

• Overview: Corrosion-resistant, retains high-temperature strength.

• Electrodes: 308L, 309L, 316L.

• Key Points: Low heat input, clean surfaces, multi-pass for thick sections.

• Applications: Chemical, food processing, and construction industries.

3. SMAW on Cast Iron

• Overview: Brittle, high carbon; prone to cracking.

• Electrodes: Nickel-based (ENi-CI, ENiFe-CI).

• Key Points: Preheat 300–600°C, slow cooling, mostly for repair work.

• Applications: Repairing machinery, engine blocks, pipes