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the vast majority of builders dont weld/braze in the jig. Many would consider it bad practice. By brazing in the jig you can build stresses into the frame. Most people, myself included, tack in the jig then remove it...you have to be in control of the welding process so as not to warp the frame, but you dont have the capacity to build in stresses.
This only goes for tig/fillet brazed frames, IDK about lugs.
Biggles567-
Ron cooper mainly used lugged. And I think they sort of hold the angles themselves. Just a bit of cold setting afterwards.
I've also seen a clip of seven cycles tigging up titanium frames that move quite a bit when building. They tack them up and change welding directions as it warps, constantly checking on a separate jig.
wildwest
I have heard about the frame stress caused by a ridged jig..in fact I remember Jason rourke saying his jig has a enough flex to cope with movement.
Old school london frame builder Ron Cooper (now sadly passed away) did away with the jig completely for the same reason.