Welding Galvanized Steel Decking. When metal deck is to be welded to supports the effective fusion area is at least 12 in. The same welding processes volts amps travel speed etc.
This is known to happen to large areas of galvanized decking after welding to steel joists. Form deck is furnished galvanized prime painted or uncoated. For hot-dip galvanized steel the same process can be performed but the end results are somewhat different.
Zinc is the coating used on galvanized metals and when you heat the metal it produces vaporized metal droplets which are.
However using the same washer type and the same welding rates with a thicker steel deck panel may severely limit heat available for penetration into the substrate. However for closed in areas ventilation must be provided. Long for arc seam welds. In the case of galvanized metal decking removing zinc from the area of the weld is impractical.