You can weld muffler pipes but you need to weld and let it cool and wire brush it and weld again. I usually cut the end of the wire between welds with wire cutters to start with a fresh wire tip to get a good weld. I keep a coffee can near by to cut the old wire into so I wont have it all over the ground.
The welder has paid for itself at least 2 times with all the little repairs I have made over the 2 years I have had it.
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