No good joining . The spaces between the titanium are too fine. They should have been wider from each other. Next time I will keep the spaces wider and I will drill holes through the titanium sides, so as to squash the various titanium pieces in place with the cast silver as it contracts.
The next one I will sprue more sprues but of thinner diameter.
I will drill the titanium pieces .
And cast at the lowest possible temperature....Watch this space....