Q.

Which of the following defects occur due to the entrapment of gas bubbles by the freezing dendrites during the cooling of molten pad?

A. inclusion of slag
B. inadequate penetration
C. incomplete fusion
D. porosity
Answer» D. porosity
Explanation: referred to as worm holes, these are gas pockets trapped in the weld. a couple of reasons would be from not enough shielding gas in mig, or moisture in the flux.
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