Indian & Harley frames were furnaced brazed for a long time,
but,
I think they did have the odd plug weld.
I dont think brazing a frame has any strength issues if they are slip fit joints, then brazed.
On vintage bicycle frames they are often brazed which leaves a nice clean joint, and they hold up very well.. I probably could show a dozen examples tha are 50 years old if you come to visit..
Oh and St Pattie is a burger.. not the Irish dude..kghost..