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Welding and Joining Techniques Flashcards

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

Read the first 7 Welding and Joining Techniques flashcards as text

  1. What is the primary purpose of back purging with argon gas when welding stainless steel pipe?

    Answer: To prevent oxidation on the inside of the pipe

    Back purging with argon displaces oxygen inside the pipe, preventing oxidation (sugaring) on the weld root, which is critical for corrosion resistance in stainless steel.

  2. In orbital welding, what does the term 'weld schedule' refer to?

    Answer: A pre-programmed set of welding parameters for a specific pipe and material

    A weld schedule in orbital welding is a stored set of parameters (amperage, travel speed, pulse settings) programmed for a specific pipe diameter, wall thickness, and material.

  3. When using an oxyacetylene torch for pipe brazing, the correct flame adjustment for most copper alloy work is:

    Answer: Neutral flame

    A neutral flame (balanced oxygen and acetylene) is correct for brazing copper alloys as it neither adds carbon nor oxidizes the base metal.

  4. What is the minimum preheat temperature typically required for P91 chrome-moly alloy steel pipe welding?

    Answer: 400°F (204°C)

    P91 (9Cr-1Mo) alloy steel requires a minimum preheat of 400°F (204°C) to prevent hydrogen-induced cracking and ensure proper martensitic transformation.

  5. Which welding discontinuity is most likely to result from improper interpass temperature control during multi-pass pipe welding?

    Answer: Hot cracking

    Excessive interpass temperatures increase the heat-affected zone and can cause hot cracking in materials susceptible to liquation cracking between passes.

  6. A pipefitter is joining a carbon steel pipe to a stainless steel pipe. Which filler metal is typically used for this dissimilar metal weld?

    Answer: ER309L

    ER309L is the standard filler metal for dissimilar metal welds between carbon steel and stainless steel because its higher alloy content accommodates dilution from both base metals.

  7. What does PWHT stand for and when is it most commonly required in pipe welding?

    Answer: Post-Weld Heat Treatment — required on thick wall or alloy pipe to relieve residual stress

    PWHT (Post-Weld Heat Treatment) is applied after welding to relieve residual stresses and temper the heat-affected zone, commonly required by code on thick carbon steel or alloy pipe welds.