You wouldn't find me purging with Nitrogen! Your fit up would have to be PERFECT and you'd have to be a really good welder! Maybe a pro could get away with it but it's nothing I'd try.
Just use ARGON like you're supposed to. Either get a dual regulator so you can have one hose purging and the other to the torch -- or get another bottle of Argon and get a regulator on it. Either way - if you're going to do this kind of work you'll need it set up.
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