The zinc is applied by a hot dipping process. This wire is not subject to US grading standards. In the United States there is a recognized AISI grading system for galvanized before welding wire. It is based on the amount of zinc coated on the wire. Most cage wire is class 1 wire.
Most wire produced in the USA is galvanized before welding.
A very small part of the welded wire market is for cages. A smaller percentage of that market is aviary wire. Most of the wire sold through hardware stores for cage wire is galvanized before welding. Many distributors and consumers focus more on the wire spacing for square corners rather than on the galvanization process. Preparation of any wire is a critical step in cage construction.