When welding galvanized base metal, how far must coatings be removed from the weld joint?

When welding galvanized base metal, it is necessary to remove the zinc coating from the area around the weld joint to ensure a clean and effective weld. Removing the coating helps in avoiding contamination that can affect the integrity and quality of the weld, as the zinc can vaporize upon heating and create porosity or defects in the weld.

The requirement to remove the coating for a safe distance generally stipulates that at least 2 inches of the galvanized surface should be cleared from the weld area. This distance helps to ensure that the weld itself is free from any potential interference caused by the zinc coating, allowing for better fusion of the base metals. Proper cleaning not only enhances the quality of the weld but also reduces any safety hazards associated with welding galvanized materials. Therefore, removing the coating for a 2-inch radius around the weld joint is essential for successful welding practices.