That is what i primarily use on the truck for fence and railing repair and installation.
Welding galvanized fence pipe.
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.
Galvanized steel welds similar to uncoated carbon steel when properly prepped.
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.
Arc welding is a versatile method that uses alternating currents to create a high heat arc that melts your flux.
Your 4600 running watts generator will power a portable mig welder with 030 or 035 fluxcore wire at a plenty high enough setting to weld the pipe.
Fluxcore wire welding works just fine in the field for fence work.
The weld strength should be the same whether welding galvanized steel or not.
As long as the zinc oxide gets access to air to burn off.