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I once cooked a headgasket and blew out a radiator. I patched it with a piece of sheetmetal and plain, regular JB weld.
I would just go with the regular JB weld, try to get your two pipes to fit as close as possible. Rough up the surface with a pocket knife. If you can, wrap/place some wire in there to act like rebar under the JB weld.
Most important for adhesion:
Gouge/rough up the surfaces
Clean with alcohol
Dry the mocked up assembly with a hair drier
Allow the JB to setup up over 48 hours, in a warm (70*F+) area before putting it in service
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