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This is a pretty common thing for people to do when their roll pins wear out. You may be able to shallow out the welds with a grinder or cutoff wheel and separate everything. If not, I'm pretty sure the only option is to use a porta-power or something similar to cut the axles out.
I'd use a cut off wheel to shallow em out, get the sprocket hot with a torch, then twist it with two pipe wrenches. That's a minor tack weld, so there can't be a whole lot of penetration between the two. Just remove what you can and give it a go, if you only heat the sprocket the heat expansion should add a lot of pressure to help it break the remaining weld.