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It may be impossible to completely stop leakage from that slip fit joint. But let’s try minimizing leakage… If the tube is corroded where it fits up into the aluminum housing, it needs to be cleaned up. If you have the capability to expand the tube for a tighter fit, this can be done by carefully hammering the surface of the tube while rotating on a steel bar. Proceed slowly , trying the fit and maintain roundness.
Other than that fix… consider using high temperature silicone sealer. Also … at the auto parts store they sell “muffler sealant” , kind of a grey paste the comes in a squeeze tube. Or, try the suggester aluminum foil, different thicknesses, foil, HD foil and finally pie plate.
Joe B