Fluxcore wire welding works just fine in the field for fence work.
Welding galvanized fence pipe.
Welding thick galvanized coatings or butt welds or welding creases or corners where the galvanization naturally builds up benefits from grinding the galvanization off first.
If you attempt to weld galvanized steel without removing the galvanizing from the weld area the weld puddle will pop blow out and create a health hazard to the welder and any individuals in the immediate area.
Arc welding is a versatile method that uses alternating currents to create a high heat arc that melts your flux.
A standard arc welder is undoubtedly the best way to weld galvanized steel.
The weld strength should be the same whether welding galvanized steel or not.
Use an arc welder to weld galvanized steel.
That is what i primarily use on the truck for fence and railing repair and installation.
If you can work outside when using an arc welder.