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Re: best way to fill the trim holes??
My Lincoln's 120v and I use .023 solid wire; is yours fluxcore (shielded) wire only - can you add gas?
I've read on here guys have welded very thin sheetmetal with shielded, heavier gauge wire, like .030-.035, but for me it was very messy, tends to make bigger holes - that seems more useful for heavier-gauge structural stuff.
You could also try holding or clamping copper/aluminum backing behind the holds
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