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The specification ASTM D7803 contains detail on how to prepare the hot-dip galvanized surface for powder coating. The AGA offers, Preparing HDG Steel for Powder Coating, a package that includes an instructional guide booklet and step-by-step DVD video on how to prepare the hot-dip galvanized steel surface for powder coating. Welding Galvanized - I Quit!Galvanized coating is pretty much just zinc. Some other problems to watch for are using a high silicon content wireif you are using bare wire mig welding. E70s2 would be a better choice than E70s6. Too much silicon mixed with zinc can cause cracks. Welding Galvanized Steel -- SafelyThe difference between welding galvanized steel and welding uncoated steel is a result of the low vaporization temperature ofthe zinc coating. Zinc melts at about 900F and vaporizes at about 1650F. Since steel melts at approximately 2,750F andthe welding arc temperature is 15,000 to 20,000F, the zinc that is near the weld does not stand a chance -- it's vaporized!By the time the weld pool freezes,
Sheet Metal Fabrication, Stainless Steel Enclosure, Galvanized Steel Boxes manufacturer / supplier in China, offering OEM ODM Sheet Metal Fabrication Steel Welding Galvanized Part, China Factory for Stainless Steel Sheet Metal Enclosure Box, OEM ODM Sheet Metal Fabrication Stainless Steel Frame Powder Coated Steel Cage and so on.Welding of Coated Steels ::Total Materia ArticleWelding of zinc-coated steel can be done, but specific precautions should be taken. When galvanized steel is arc welded the heat of the welding arc vaporizes the zinc coating in the weld area. This is because the boiling point of zinc is below the melting point of steel. The zinc volatilizes and leaves the base metal adjacent to the weld.