Exam API-571 All QuestionsBrowse all questions from this exam
Question 40

Caustic embrittlement cracking can be effectively prevented by means of PWHT at a temperature of _______.

    Correct Answer: B

    Caustic embrittlement cracking can be effectively prevented by means of a Post Weld Heat Treatment (PWHT) at a temperature of 1150º F. This temperature is considered effective for stress-relieving treatments in carbon steel, which is necessary to prevent such types of embrittlement. Therefore, the correct answer is 1150º F.

Discussion
ahmadmmOption: B

Cracking can be effectively prevented by means of a stress-relieving heat treatment (e.g. PWHT). A heat treatment at 1150 °F (620 °C) minimum with a minimum holding time of 1 hr is considered an effective stress relieving heat treatment for carbon steel. The same requirement applies to repair welds and to internal and external attachment welds.