I'm not claiming to be any expert, however I was a welder/sheet metal fabricator at a manufacturing plant for a while. I've never seen anybody double pass mig over a thin piece of exhaust unless they blew a hole through it the first pass. Maybe a capped tig to make it look pretty but that's it. Also, you can't see a second brown string along the welds, once again eluding that there wasn't a second pass.
Max
Max
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