Since this metal on the trailer tubing is only 3/16, should I weld it with my Hobart Mig 135 with .30 wire and Argon/Co2 mix, or the same welder with .35 flux core, or arc welder?
I am a newbie welder and was not sure what the advantages/ disadvantages are. (Other than with the wire and gas there is no flux obviously). I guess it seems mig is a liitle easier but maybe not as much penetration?
I would think that the difference is mostly personal.
Assuming that you're competent, you should be able to do a perfectly good job with any of the methods you list.
Stick welding (they're all 'arc' welding) will make ugly welds and will take the most time. In theory you can get away with dirtier metal with stick welding but I always try to get things clean enough to solder these days -- I screw up welds enough other ways, I don't need to screw them up with dirt.
MIG welding will make the prettiest welds (assuming you're good), it'll be fast, and penetration should be sufficient for a good weld (assuming you're good).
I have just about no experience with flux core wire, but I assume it'll be as fast as MIG welding and almost as pretty. You'll have to clean up the flux afterward, though.
Perhaps you should make some test welds on some scrap, then decide which method is best for _you_.
"Tim Wescott" wrote: (clip) I have just about no experience with flux core wire, but I assume it'll
^^^^^^^^^^^^^^^^^^^^^ I use flux core a lot. If you are working outdoors, you have to worry about breezes with gas shielding. Flux core runs a little hotter, which may help. Cleaning the flux off is no problem--there isn;t much, and it isn't tightly adhered.
Thank you for posting what I consider one of the best pieces of advice ever posted here. Kudos. A monkey can make a good looking MIG weld with a couple of days training. Whether or not it will hold is another thing. I've had lots of MIG stuff come apart, but they were ornamental metal and decorative things, and not structural of over the road. On the surface they looked fine, but underneath, they were not.
Good on you for your advice. For the OP, weld it up. Pull it, hammer it, bend it, saw it in half through the weld. See what you got, and don't go by looks alone. Consider FCAW as the polarity is different, and gets better penetration.
If you mean using flux cored wire on a wire feed welder, then the answer is there is no difference at all. Same thing.
If you mean using some type of shield gas when you say mig (Metal Inert Gas or GMAW - Gas Metal Arc Welding
then you are talking about dual shielding, which is flux cored wire used with an inert gas shielding your work as well. In which case the only difference is you are running gas with FCAW. Which if I remember right it lets you run heavier wire than you can with just FCAW alone.