Problem: Zinc on galvanized steel can react with iron, forming compounds that create porosity or inclusions in the weld. Impact: These defects reduce weld strength and toughness, compromising safety. The zinc layer emits harmful vapors when heated, creating health hazards without adequate airflow. It also weakens the weld joint by causing defects like porosity, and the burned-off coating leaves the area vulnerable to. But he caught me welding some galvanized pipes and said it is a no-no. You can weld the material just be sure to clean the coating off and wear a respirator when you're removing it with a grinder. Why would you weld a cable tray? I can almost weld well enough. , ABB offers steel cable tray with pre-galvanized and hot-dip galvanize lvanization is an economical and effective way to protect steel ag tal, naturally oxidizes when exposed to air, but at a much slower rate than steel. Worker safety must also be taken into consideration. The correct way to do it will depend on the specific galvanised steel welding project.