Yeah, the rear triangle is brazed on this year, front is TIG. The toptube flares are filled with braze while the main TT join to seat-tube is TIG.
Old repair was MIG, and baisically, just far too much weld and not enough control using this method. The weld also didn't have full-pen as I found out.
I used a 240V TIG inverter with power down to get the contol and had to grind down the rods to around 0.5mm dia. I would have sooner just brazed, but no access to the kit, but the TIG was good and was able to keep heat quite low with the thin rods.
I should have said before, but the joint failed origionally from the previous owner having the seatpost too short and it didn't go into the frame far enough.