When repairing damaged coatings, all welds made after galvanizing shall be ground smooth and wire brushed; the cleaned areas shall be coated with which material?

• A. Zinc Dip Coat
• B. 50-50 Solder
• C. Galvanized Paint
• D. Any of the above

Answer: (B)

When galvanized coatings are welded, the zinc protective layer is damaged at the weld and around it, so the repair area must be coated to restore corrosion resistance. After grinding and cleaning, the best fit in this context is to apply a tin-lead solder (50-50 solder) over the cleaned area. The solder creates a continuous, sealed surface on the weld zone, protecting the base metal from moisture and rust while a longer-term zinc-containing finish can be applied later. This immediate coating helps maintain the galvanic protection of the repaired spot.