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Base Metal Preparation Flashcards

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

Read the first 7 Base Metal Preparation flashcards as text

  1. Which tool is most appropriate for removing mill scale from a narrow weld groove prior to GTAW on carbon steel?

    Answer: Die grinder with carbide burr

    A die grinder with a carbide burr can reach into tight grooves and remove mill scale without leaving abrasive particles that could contaminate the weld.

  2. When performing an oxy-fuel cut on carbon steel plate, the cut edge should be ground before welding primarily to remove:

    Answer: Drag lines and hardened surface layer

    Oxy-fuel cutting produces a hardened surface layer from rapid quenching and drag lines that can act as stress risers if not removed prior to welding.

  3. Interpass cleaning between weld passes is required mainly to prevent:

    Answer: Slag inclusions in the completed weld

    Removing slag between passes prevents slag entrapment, which would appear as inclusions in radiographic or ultrasonic inspection of the finished weld.

  4. What is the correct fit-up root opening for a standard single-V butt joint when using SMAW on ¼-inch plate?

    Answer: 1/16 to 3/32 in

    A root opening of 1/16 to 3/32 inch provides adequate access for the electrode to achieve root fusion without excessive melt-through.

  5. A welder is preparing aluminum base metal for GTAW. Which preparation step is unique to aluminum compared to steel?

    Answer: Mechanical removal of the oxide layer immediately before welding

    Aluminum's oxide layer (Al₂O₃) has a much higher melting point than the base metal and must be freshly removed immediately before welding to prevent oxide inclusions.

  6. Which discontinuity is most likely caused by inadequate cleaning of a lap joint surface before welding?

    Answer: Porosity

    Contaminants such as oil, rust, or moisture on faying surfaces vaporize during welding and become trapped gas pores in the solidifying weld metal.

  7. On a T-joint fillet weld, what is the effect of excessive gap between the web and flange members?

    Answer: Increased required filler metal and potential burn-through

    An excessive gap in a T-joint increases the volume of filler needed and can cause the arc to burn through the root rather than fusing both members.