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Riveted joints: purpose of caulking operation In plate joints for boilers/tanks, caulking is done after riveting. Identify the primary objective of caulking.

Difficulty: Easy

To prevent corrosion
To increase tensile strength of the joint
To relieve residual stresses
To make the joint leak-proof

Correct Answer: To make the joint leak-proof

Explanation:

Concept
Caulking peens/burrs the plate edges along the riveted seam to close capillary gaps, ensuring fluid tightness of boiler and tank joints.

Notes
It is not intended to raise tensile capacity nor to remove stresses; it specifically improves tightness against leakage.

Final Answer
To make the joint leak-proof.

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