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Welding & Metalworking Techniques Flashcards

7 cards from real CCC 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. Which welding process is most commonly used for MIG (GMAW) welding in collision repair shops?

    Answer: Gas Metal Arc Welding (GMAW)

    Gas Metal Arc Welding (GMAW), commonly called MIG welding, is the industry standard in collision repair due to its speed, ease of use, and clean welds on automotive steel.

  2. What shielding gas mixture is most commonly recommended for MIG welding mild steel in automotive collision repair?

    Answer: 75% Argon / 25% CO2

    A 75% Argon / 25% CO2 mix (C25) provides excellent arc stability, good penetration, and minimal spatter, making it the standard choice for welding mild steel panels.

  3. When sectioning a pillar or rocker panel, where should the weld seam be placed according to best collision repair practices?

    Answer: At least 2 inches from any factory seam or joint

    Industry guidelines require sectioning welds to be placed at least 2 inches away from factory seams or joints to avoid weakening structural areas already subjected to stress.

  4. Which type of weld is primarily used to join two overlapping panels in collision repair?

    Answer: Lap weld

    Lap welds join two overlapping panels and are extensively used in collision repair when replacing body panels that are spot-welded from the factory.

  5. What is the purpose of a stitch weld (skip weld) technique when welding automotive sheet metal?

    Answer: To reduce heat buildup and panel warpage

    Stitch welding uses alternating weld and skip intervals to allow the metal to cool between passes, preventing excessive heat buildup that causes panel warping.

  6. When replacing a factory spot weld, which method is preferred to replicate the original bond in collision repair?

    Answer: Resistance spot weld or plug weld

    Resistance spot welding exactly replicates the OEM process; when not available, plug welds via MIG are the accepted alternative, making either method preferred depending on equipment availability.

  7. What wire diameter is most commonly used for welding thin automotive body panels (18–20 gauge) in collision repair?

    Answer: 0.023 inch (0.6 mm)

    0.023 inch (0.6 mm) wire is preferred for thin gauge automotive sheet metal because it deposits less heat and material, reducing the risk of burn-through.