Yes I agree with everyone, it doesn't look too bad (apart from being ugly) and probably won't fail. Especially if it gas-pipe tube-- you can get away with more since it's all just mild steel. It looks like he had a lousy fit up and then made a mess trying to fill in the gap. The ST itself probably escaped the worst of it because it's the edges of the notched tube that burn back (requiring the addition of more boogers). Actually whenever I see welds on frames that look suspiciously smooth and neat I wonder if this has happened, only they filed it down afterwards to hide their shame!