they do look nasty don't they? i made sure that the only cracks are in the head tube, at least that's what the seller insisted. i do know how to weld but i plan on taking the head tube out and replacing it. i figure it's cheap enough to experiment. i have done some silver and brass brazing before but never on a frame. as long as i can get the old tube out (i've heard that is by far the hardest part) i think i'll be o.k.
paul