CCC Welding & Metalworking Techniques 1

Question 1

Which welding process is most commonly used for MIG (GMAW) welding in collision repair shops?

Accepted Answer

Gas Metal Arc Welding (GMAW)

Answer

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.

Question 2

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

Accepted Answer

75% Argon / 25% CO2

Answer

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.

Question 3

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

Accepted Answer

At least 2 inches from any factory seam or joint

Answer

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.

Question 4

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

Accepted Answer

Lap weld

Answer

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

Question 5

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

Accepted Answer

To reduce heat buildup and panel warpage

Answer

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

CCC Practice Test

CCC Practice Test

CCC Welding & Metalworking Techniques 1