Re: welders?
Ken, as mentioned small wire is very helpful, but when I put a panel in or do a repair, I tack at opposite ends, then find a middle poit and tack, let things cool, and continue in that fashion...when done you will have a solid series of "tacks" to grind down, the better you get at it, the less spots you'll find you missed.
Just make sure the last tacks you've done are cooled to touch to minimize warpage.
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