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Pipe Fabrication and Joining Flashcards

6 cards from real PIPEFITTER 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 minimum preheat temperature required by AWS D1.1 when welding carbon steel with a carbon equivalent greater than 0.40?

    Answer: 150°F (65°C)

    AWS D1.1 and ASME B31.3 require a preheat of at least 150°F when the carbon equivalent exceeds 0.40 to prevent hydrogen-induced cracking.

  2. When making a socket weld joint, what is the standard gap that should be left between the pipe end and the socket bottom?

    Answer: 1/16 inch (1.6 mm)

    ASME B31.3 requires a 1/16" gap between the pipe end and the socket shoulder before welding to allow for thermal expansion.

  3. What type of pipe joint is made by heating the end of a pipe and forming a conical seating surface that mates with a flared fitting?

    Answer: A flared joint

    A flared joint is made by flaring the pipe end into a cone shape that mates with the angled seat of a flare fitting, creating a metal-to-metal seal.

  4. What is meant by 'back-purging' during stainless steel pipe welding?

    Answer: Flowing inert gas inside the pipe to protect the weld root from oxidation

    Back-purging means flowing argon or nitrogen through the inside of the pipe to displace oxygen and protect the weld root from oxidation (sugaring).

  5. In threaded pipe joints per ASME B1.20.1, what is the standard taper of NPT (National Pipe Taper) threads?

    Answer: 1/16 inch per inch (1 in 16)

    NPT threads have a taper of 1/16 inch per inch (3/4 inch per foot) as specified in ASME B1.20.1.

  6. What is the primary advantage of a 'butt weld' joint over a 'socket weld' joint for larger pipe sizes?

    Answer: Butt welds provide full penetration with no crevice for corrosion or trapped fluid

    Butt welds join pipe end-to-end with full penetration, eliminating the crevice between pipe and socket that can trap corrosive fluids or cause fatigue cracking.