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Exam API-571 topic 1 question 38 discussion

Actual exam question from API's API-571
Question #: 38
Topic #: 1
[All API-571 Questions]

Weld heat affected zone graphitization is most frequently found in the heat affected zone adjacent to welds in a narrow band, corresponding to the low temperature edge of the heat affected zone. In multi-pass welded butt joints, these zones overlap each other covering the entire cross section. Because of its appearance, this type of graphitization is called________.

  • A. Half-moon
  • B. Eyebrow
  • C. Radii
  • D. None of the above
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Suggested Answer: B 🗳️
by ahmadmm at Sept. 5, 2023, 7:57 a.m.

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ahmadmm
1 year, 4 months ago
The second and more damaging type of graphitization results in chains or local planes of concentrated graphite nodules. Because of its appearance, this type is also known as “eyebrow graphitization.” This form of graphitization can result in a significant reduction in load-bearing capability while increasing the potential for brittle fracture along this plane.
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