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Pipe Fabrication & Welding Standards Flashcards

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

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  1. What is the significance of the 'essential variable' concept in ASME Section IX welding qualifications?

    Answer: It identifies variables whose change requires requalification of the WPS

    Essential variables are those welding parameters where a change beyond specified limits is believed to affect the mechanical properties of the weld, requiring a new PQR and revised WPS.

  2. According to ASME B31.3, what type of joint must be used for all fluid services in Category M (highly toxic) service?

    Answer: Butt-welded joints for all sizes

    ASME B31.3 Chapter VIII for Category M service requires butt-welded joints throughout to minimize leakage risk for highly toxic fluids.

  3. During hydrostatic pressure testing of a piping system per ASME B31.3, the test pressure must be at least:

    Answer: 1.5 times the design pressure adjusted for temperature

    ASME B31.3 paragraph 345.4.2 requires hydrostatic test pressure of at least 1.5 times the design pressure, adjusted by the ratio of allowable stress at test temperature to allowable stress at design temperature.

  4. What is the maximum allowable mismatch (high-low) between pipe wall interiors at a butt weld per ASME B31.3 for normal fluid service?

    Answer: 1/8 inch (3.2 mm) or 25% of wall thickness, whichever is less

    ASME B31.3 paragraph 328.4.3 limits weld joint internal misalignment to 1/8 inch or 25% of the thinner component wall thickness, whichever is less.

  5. Which welding process is classified as a 'low hydrogen' process, making it preferred for welding higher-strength and thicker carbon steel pipe?

    Answer: SMAW with EXX18 low-hydrogen electrodes

    EXX18 electrodes have a low-hydrogen flux coating that limits diffusible hydrogen in the weld deposit, reducing the risk of hydrogen-induced cracking in susceptible steels.

  6. In pipe spool fabrication, what is the purpose of a 'weld map'?

    Answer: A document that identifies weld joint locations, weld numbers, and applicable WPS for each weld on a spool

    A weld map is an isometric or orthographic drawing that assigns unique weld numbers to each joint, cross-referencing the applicable WPS, welder ID, and NDE requirements for full traceability.

  7. What does the AWS classification 'ER308L' designate for stainless steel filler metal?

    Answer: An electrode/rod for welding P-No. 8 austenitic stainless with low carbon content

    ER308L is an electrode/rod (ER) matching 308 stainless composition with low carbon (L ≤0.03%) to minimize sensitization, used to weld 304/304L base material.