Practice Test Geeks(API 510) Certified Pressure Vessel Inspector Practice Test
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API 510 Welding Procedures and Qualifications Flashcards

6 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 API 510 Welding Procedures and Qualifications flashcards as text

  1. What is the primary purpose of post-weld heat treatment (PWHT) in pressure vessel repairs?

    Answer: Stress relief and improved resistance to stress corrosion cracking

    PWHT is primarily performed to relieve residual welding stresses and improve resistance to stress corrosion cracking and hydrogen embrittlement.

  2. According to ASME Section VIII Div. 1, PWHT is mandatory for carbon steel welds when the nominal thickness of the base metal exceeds what value?

    Answer: 1-1/2 inches (38 mm)

    ASME Section VIII Div. 1 requires mandatory PWHT for P-1 carbon steel when base metal thickness exceeds 1-1/2 inches.

  3. Which type of weld joint is used when only one side of a pressure vessel shell is accessible for repair welding?

    Answer: Single-welded butt joint with backing strip

    When access is limited to one side, a single-welded butt joint with a backing strip is commonly used to achieve full penetration and adequate root quality.

  4. Under API 510, an authorized inspector must review and accept which document before repair welding begins on a pressure vessel?

    Answer: The repair plan and applicable WPS/PQR

    The authorized inspector must review and accept the repair plan and applicable Welding Procedure Specifications (WPS) and Procedure Qualification Records (PQR) prior to commencing repair work.

  5. When performing a temper bead welding technique, what is its primary advantage over conventional PWHT?

    Answer: It refines the heat-affected zone grain structure without furnace PWHT

    Temper bead welding uses controlled deposition of successive weld beads to refine and temper the heat-affected zone, achieving stress relief without furnace PWHT.

  6. A change in base metal P-number is considered what type of variable in ASME Section IX welding procedure qualification?

    Answer: Essential variable

    A change in base metal P-number is an essential variable requiring requalification of the welding procedure because it affects the metallurgical properties of the weld.