Your search did not yield any results

Site Pages

Dr. Galv KnowledgeBase



What welding sprays are suitable for galvanizing?

When welded items are hot-dip galvanized, the cleanliness of the weld area before galvanizing plays an important role in overall coating quality and appearance. Welding slag and spatter must be fully removed prior to galvanizing to prevent bare spots in the coating, but the use of some welding sprays or spray-release agents can be problematic as well. 

Welding anti-spatter sprays generally contain silicone, but some are water based or solvent based. Sprays containing silicone are often not effectively cleaned by the hot-dip galvanizing pre-treatment process. These products leave a film on the surface that must be removed by the fabricator prior to galvanizing or else bare areas will result near the weld where the spray was applied. Water-soluble welding sprays are recommended because they are likely to be fully removed in the galvanizing pre-treatment process without any effort from the fabricator. Some fabricators and galvanizers have success with solvent-based sprays (e.g. Weld-Aid Weld Kleen HD). However, the variety of available products in the marketplace have not been tested.  

When in doubt? Ask your galvanizer to run a test sample. 

For more information on how to improve the appearance of hot-dip galvanized coatings near the weld area:  Welding Appearance After HDG 

Was this answer helpful? YES       | NO

Are you still looking for the right answer? Ask an Expert