CCC Welding & Metalworking Techniques 2

Question 1

Which personal protective equipment (PPE) is mandatory when performing MIG welding in a collision repair facility?

Accepted Answer

Welding helmet with appropriate lens shade, gloves, and flame-resistant clothing

Answer

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.

Question 2

What does the term 'heat-affected zone' (HAZ) mean in the context of collision repair welding?

Accepted Answer

The zone around a weld where metal properties are altered by heat without melting

Answer

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.

Question 3

Why is it especially important to control heat input when welding Advanced High-Strength Steel (AHSS) in modern vehicles?

Accepted Answer

Excessive heat destroys the engineered microstructure of AHSS, reducing its strength

Answer

AHSS panels are thermally processed to achieve specific strength properties; excessive heat during repair destroys these properties, compromising structural integrity and crash performance.

Question 4

What is the correct lens shade range recommended for MIG welding at currents between 60–160 amps?

Accepted Answer

Shade 10–11

Answer

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.

Question 5

Before welding galvanized or zinc-coated steel panels, what should a technician do to the weld area?

Accepted Answer

Remove the zinc coating from the immediate weld zone to prevent toxic fumes and porosity

Answer

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.

CCC Practice Test

CCC Practice Test

CCC Welding & Metalworking Techniques 2