I took care of a few things tonight. One of them was to weld up some burn throughs. To plug weld you need to back up the hole with a piece of copper, otherwise your attempt to plug the hole will create a bigger hole. Here is the other key that I missed before, turn the heat way down or your copper will join the filler material. Many places sell what are called copper spoons for plug welding. Eastwood's is like $40. For free you can smash an old piece of pipe in a vice:
Plug weld visible just above the clamp at the opening:
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