I'm have some 3"x5" rectangular tube I'm planning on using for making a rear bumper on my 4x4. It's somewhat common to use bumpers as storage tanks with onboard air to actuate lockers, and I'll be running a pressure switch that cuts off at 110 PSI.
Will my MIG welds for this be porous enough that they leak air, and is there anything I can do to prevent it? I have an OA torch that I could use to re-melt the welds, but I don't know if that would do any good. Obviously my experience level is pretty low with this, so any advice would be helpful.
- James B