Adhesive joint and thermite weld joint
grabcad
Use of adhesive or any chemical reaction like 1. controlled thermite reaction using thermite paste 2. Use of semisolid adhesive to make a solid bond, adhesive is covered/ sealed during transport which will eliminate any leakages because of forces due to launch. Since it will be semisolid, pressure issues won't be an issue. 3. If a thermite reaction is used, an electric circuit will be used to initiate a thermite reaction. Power to the circuit is to be taken as storage battery or power from solar cells.
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