Clean Steel welded fence is dipped into molten zinc(at 450*c). A Zinc layer is formed around the steel which prevents the steel from corroding as the steel will not be in contact with air and water. Furthermore, Zinc will corrode and not the steel when the layer is accidentally removed, and the steel is exposed.

One advantage of hot-dip galvanizing is that the entire part is covered including the edges, welds, etc. giving it an all-round corrosion
Protection. The end product can be used outdoors in all different weather conditions.