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.
Read the first 7 Welding & Metalworking Techniques flashcards as text
Which personal protective equipment (PPE) is mandatory when performing MIG welding in a collision repair facility?
Answer: Welding helmet with appropriate lens shade, gloves, and flame-resistant clothing
OSHA and industry standards require a welding helmet with appropriate auto-darkening or fixed lens shade, heat-resistant gloves, and flame-resistant clothing to protect against UV radiation, sparks, and molten spatter.
What does the term 'heat-affected zone' (HAZ) mean in the context of collision repair welding?
Answer: The zone around a weld where metal properties are altered by heat without melting
The heat-affected zone (HAZ) is the area adjacent to a weld where the base metal's microstructure and properties are changed by welding heat without actually melting, potentially weakening high-strength steel.
Why is it especially important to control heat input when welding Advanced High-Strength Steel (AHSS) in modern vehicles?
Answer: Excessive heat destroys the engineered microstructure of AHSS, reducing its strength
AHSS panels are thermally processed to achieve specific strength properties; excessive heat during repair destroys these properties, compromising structural integrity and crash performance.
What is the correct lens shade range recommended for MIG welding at currents between 60–160 amps?
Answer: Shade 10–11
AWS and OSHA guidelines recommend lens shade 10–11 for MIG welding at 60–160 amp current levels to adequately protect eyes from arc radiation.
Before welding galvanized or zinc-coated steel panels, what should a technician do to the weld area?
Answer: Remove the zinc coating from the immediate weld zone to prevent toxic fumes and porosity
Zinc coating must be removed from the weld area because burning zinc produces toxic fumes and causes weld porosity; the coating should be re-applied after welding for corrosion protection.
Which destructive test is used in a collision repair shop to verify spot weld quality and penetration?
Answer: Peel or chisel test
The peel or chisel test physically separates welded panels to inspect nugget size and penetration, confirming that spot welds meet strength requirements before production use.
What is the primary reason for applying weld-through primer to bare metal flanges before welding overlapping panels?
Answer: To prevent corrosion between mating surfaces that cannot be reached after welding
Weld-through primer provides corrosion protection to the mating surfaces between panels that will be permanently sealed by the weld and inaccessible for future coating.