Hey y'all. Long story, but I basically ended up with this cracked frame for free. The crack is down at the BB shell, around about a third of the seat tube. I've always loved these old KHS frames, and I'm hoping to bring this one back to life.
Does anyone have some advice on repairing an old aluminum frame? I know how difficult it is to repair aluminum (finding the right filler material for the alloy, heat-treating, stresses at the heat-affected-zone, etc) but since I've got this frame for free, I'd love to repair it. Whether it's a proper repair, or a bit of a bodge is kinda up for debate.
So what does the LFGSS thinktank have to say? Any ideas what series alloy these old frames are made from?