mig welding frame air tank

I want to build a new crossmember for my three link out of 2"X3" tubing. I want to use it as a manifold to connect my air tank and valves. The tank is in the bed and valves on the frame. could i achieve air tite welds with a mig. I have a 110v flux core wire welder and i kinda wanted to use it, but i do have limited acces to a solid wire mig. is it possible with the 110v welder or should try to use the full on mig at my work if they let me.

I wouldnt use the flux core them things dont weld very clean they always seem to leave perosity in the welds. Atleast the one I have does.

Edited: 1/14/2009 5:13:36 PM by UnusualFabrication

You can do it but you will more than likely have several pin holes to drill out and fill in.  You can preheat it slightly before using your 110V welder and the puddle will flow alittle better.  Also the longer you can run a consistant bead, more than likely, the less pin holes you'll have.  The rear clip on the 90 S-10 in my profile is MIG welded and pressure tested to 180psi with zero leaks. I'd use the gas if at all possible.

Id wait to have a gas machine, a TIG welder would be ideal but not everyone has access to one.

Thank's for the feed back im gonna try and pirate the one from my work on the weekend cause i don't have a torch to pre-heat the metal and it sounds safer to do it with the better tools.

Ya if youre talking mig, flux core, AND 110v, you got 3 things against you, not good. MIG will def work, but Id use gas, and 220v. I did the frame on my crewcab and it held to 175psi for three years. It would leak down maybe 5psi after 2 weeks (used to sit in the winter), could have been anything tho.

The 1990 S-10 in my profile has been sitting all winter with air in the bags and frame/tank and its lost less than 5 psi in a couple months and it was welded with a 115V 135 amp machine and gas shielded wire.  I'd also like to note that flux core burns hotter than gas shielded wire which is why they reccommend using flux cored wire on thicker steel in the smaller 115V machines.  I do not know how well flux cored wire works on air tight parts as I have never pressure tested anything that was welded with flux cored wire.

yea I've never pressure tested anything with flux core but I can lay down some damn clean beads. I did a structural beam job on a building with my 220v flux core cause it was outside and the job came out great.

I bagged my whole truck with a 110v Flux core welder.. once it got hot man that little machine would throw down some clean welds!   Anywho, I welded a new bung in my air tank and have ran it up to 240psi when at shows so I am certain, if you know how to weld you will be fine

Edited: 1/20/2009 11:27:30 AM by Spin_155

i got it all done up it was a bitch to track down a few pin holes. it held 100psi without leaking.