Where could a crater crack be expected to occur in a weld?

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Multiple Choice

Where could a crater crack be expected to occur in a weld?

Explanation:
Crater cracks happen where the weld pool ends and the metal must shrink as it cools, creating high tensile stresses at those termination points. The start and the end of a weld bead are both abrupt terminations where heat flow changes suddenly, solidification finishes and restraint is highest. That combination makes cracks more likely to initiate there. So crater cracking is most likely at either the beginning or the end of the weld, not in the middle where the bead continues to be fed smoothly.

Crater cracks happen where the weld pool ends and the metal must shrink as it cools, creating high tensile stresses at those termination points. The start and the end of a weld bead are both abrupt terminations where heat flow changes suddenly, solidification finishes and restraint is highest. That combination makes cracks more likely to initiate there. So crater cracking is most likely at either the beginning or the end of the weld, not in the middle where the bead continues to be fed smoothly.

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