A small star-shaped pattern where a weld starts or stops usually indicates which discontinuity?

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Multiple Choice

A small star-shaped pattern where a weld starts or stops usually indicates which discontinuity?

Explanation:
Crater cracking shows up as a small star-like pattern at the end where the weld starts or stops because the molten metal in the crater solidifies and the contraction during cooling creates cracks that radiate from the crater edge. This pattern indicates cracks formed at the crater as the bead cools and residual stresses are released, making the start/stop region clearly visible. Surface porosity would look like tiny holes, undercut is a groove along the weld toe, and slag appears as nonmetallic inclusions on the surface—none of which produce the star-shaped crater pattern.

Crater cracking shows up as a small star-like pattern at the end where the weld starts or stops because the molten metal in the crater solidifies and the contraction during cooling creates cracks that radiate from the crater edge. This pattern indicates cracks formed at the crater as the bead cools and residual stresses are released, making the start/stop region clearly visible. Surface porosity would look like tiny holes, undercut is a groove along the weld toe, and slag appears as nonmetallic inclusions on the surface—none of which produce the star-shaped crater pattern.

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