Mig here too. .023 wire, clean the paint off where your going to weld just like any project, clean the paint off for the ground and have at it. I -welded on 2-2inch pipe elbows for the inlets. I didn't take the time to make it look real nice, as I was in a hurry and who cares, it's a UDS.
"Good judgment comes from experience, and a lot of that comes from bad judgment." -- Will Rogers
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Always modifying my smokers, just another addiction.