API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 601:

  The best method to inspect for SCC is ____.

  A. WFMT
  B. UT Shear wave
  C. AET
  D. All of the above
  A. WFMT

• Question 602:

  With hydrofluoric acid corrosion, corrosion rates increase with _______ temperatures and ______ HF concentrations.

  A. Increasing, decreasing
  B. Decreasing, increasing
  C. Increasing, increasing
  D. Decreasing, decreasing
  A. Increasing, decreasing

• Question 603:

  Dissimilar metal weld cracks (between ferritic and austenitic materials) form:

  A. At the toe of the weld in the heat-affected zone of the ferritic material.
  B. At the toe of the weld in the heat-affected zone of the austenitic material.
  C. In the parent metal on the austenitic side of the weld.
  D. In the center of the dissimilar weld.
  A. At the toe of the weld in the heat-affected zone of the ferritic material.

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  API RP 571 explains the typical location of dissimilar metal weld (DMW) cracks as follows:

  "DMW cracking usually occurs in the heat-affected zone (HAZ) on the ferritic side of the weld."

  "The difference in thermal expansion coefficients, grain structures, and creep rates between the ferritic and

  austenitic materials contributes to the development of high stress and strain concentrations in the HAZ of the ferritic material."

  API RP 571, Section 4.2.1.6 - Dissimilar Metal Weld Cracking)

  Thus, these cracks do not occur in the center of the weld or on the austenitic side, but rather at the ferritic

  HAZ, making option A correct.