Hello Orlando, there are a number of different ways you can approach this. One of the better ways is to remove the galvanized coating before trying to weld on it. If you do this you will still want to have plenty of ventilation while you are welding as you won't be able to remove the internal coating on the tubing and it will still burn and smoke a bunch. If you decide not to remove the galvanizing and still wish to weld it, I would suggest using the self-shielded flux-cored wire that can be run on your machine, probably the .030 diameter stuff. Here again be sure to use plenty of ventilation as well as some form of a respirator if at all possible.
If you decide to grind the coating I would suggest spraying some WD40 on the grinding wheel to keep it from loading up with the zinc coating while you are grinding. You could use the solid wire with a shielding gas if you decide to remove the zinc coating, but if you leave it on you may see the non-sticking issue that you are talking about, this is due to the zinc and other components of the coating interfering with the weldability of the metal. Hope this has possibly answered some of the questions that you have on this. Best regards, aevald
ORLANDO,
Please listen to aevald and hogan on this. Grind that galv. off! If you grind it off you will see that it will be possible to weld the tubing with your machine. You will also save yourself some respiratory damage, and a world of headache from trying to burn through that galv. Just My opinion on the matter.
Jeffrey