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Welding Process Fundamentals Flashcards

7 cards from real CWI 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. In GMAW, what is the primary function of the shielding gas?

    Answer: To protect the weld pool from atmospheric contamination

    Shielding gas in GMAW surrounds the arc and weld pool to prevent oxidation and contamination from oxygen, nitrogen, and hydrogen in the atmosphere.

  2. Which GMAW transfer mode is best suited for welding thin sheet metal in all positions?

    Answer: Short-circuit transfer

    Short-circuit transfer uses low heat input and a small, fast-freezing weld pool, making it ideal for thin materials and out-of-position welding.

  3. What does the term 'duty cycle' mean for a welding power source?

    Answer: The percentage of a 10-minute period the machine can weld at a rated current

    Duty cycle is the percentage of a 10-minute interval during which a welding machine can operate at its rated output without overheating.

  4. In SAW (Submerged Arc Welding), what is the role of the flux?

    Answer: It shields the arc, refines the weld metal, and can add alloying elements

    SAW flux covers the arc to prevent atmospheric contamination, stabilizes the arc, and can contribute alloying elements and remove impurities from the weld pool.

  5. What is the primary advantage of using a constant voltage (CV) power source for GMAW?

    Answer: It self-corrects arc length by automatically adjusting current as wire feed rate varies

    A CV power source maintains relatively constant voltage; when arc length changes, the machine adjusts amperage to restore the set voltage, providing self-regulation.

  6. Which of the following best describes the FCAW-S (self-shielded) process?

    Answer: Uses a flux-cored wire that generates its own shielding gases from core ingredients

    FCAW-S uses a tubular wire filled with flux compounds that decompose in the arc to generate shielding gases and slag, eliminating the need for external gas.

  7. In GTAW, what is the purpose of high-frequency (HF) start?

    Answer: To initiate the arc without the tungsten touching the base metal

    High-frequency start allows the GTAW arc to be initiated by jumping a spark across the gap, preventing tungsten contamination from contact starting.

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