I would be worried about getting enough penetration with a tiny 90 amp welder. I built a top mount manifold with the same pipe last year, tacked it with my flux cored at home and took it to work to weld it up. It took a lot of amps to get good penetration on that thick of steel. I did V groove the pipes and ran 2 passes over each joint. Turned out very nice.
I picked up a bunch of my Weld els off ebay, some guy was selling a lot of them for like $30. I think there was 12 in there if I remember right.
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