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I have a rule in my shop..... a welder (Arc or MIG) NEVER gets used on knives. Doing so creates far more problems than it solves. WI is such inconsistent material when compared to other steel types, it's impossible to know before hand what using a welder on it will do.
That being said, I have, and have seen others have marginal success with TIG welders and no filler wire/rod, but it usually a gamble, with the odds NOT in your favor.
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