better yet: throw it to a frame-builder or someone that knows how to braze!

(or just get it repaired by brazing, or if you are a bit DiY brazing can be made but you need to buy some flux, some silver/copper brazing rods, a propane torch or something like (could be a oxi-gas welder also), and google up how to braze - yet this takes a slight bit of experience to do but everything can have a start point)