I added some text to my post shortly after loading it which you likely missed. The roughly finished welds on these frames are so different to the predominantly smooth welds on the later electro forged frames. I would just like to finish the welds as they would have been from the factory.
Looking at this old listing for a similar frame it appears the welds at the top tubes are made smooth with filler and the welds at the bottom bracket are not.
1936 Schwinn Majestic “C” model part out- Frame- Original paint with decal intact and head badge. Some rub on left chain stay where bent crank was rubbing. Serial # A 23612 Fork- cracked not usable without repair but included. Truss rod fork /rods also included with rod guides bent...
thecabe.com