You can also use short pieces of all thread or solid rod cut to length you want to weld and placed in the gap. Be sure to tack both ends in place then weld away. A weld down both sides, then one or 2 down the middle to tie them both together. A lot easier than trying to fill a gap and stronger too. You can even use up old bolts this way, just cut the heads off. Or any scrap pieces of metal you may have lying around.
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