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It was welded for sure. Most are welded on the bottom of the barrel. Is there any heat stress on the inside of the receiver ? Or anywhere else?
I wouldn't worry much. Check headspace and shoot it.
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We shot it with surplus M2 ball when I picked it up from him last year. I'm not sure how much it has been shot in it's lifetime, but I can't imagine someone would go through the trouble of bedding the stock and putting NM parts and barrel on it without plans to shoot it.
I haven't shot it since then, so it wouldn't completely break my heart if that weld spot was deemed to dangerous to risk keeping it in action, but it would be nice to know if it's safe or not.
ETA, I'll keep looking but so far this is the only weld mark/discoloration I can see.