PDR Vehicle Panel Metallurgy & Body Structure

Question 1

Which property of mild steel makes it the most forgiving material for PDR technicians compared to high-strength steel?

Accepted Answer

Greater ductility and malleability

Answer

Higher tensile strength

Answer

Lower density

Answer

Higher carbon content

Question 2

What is 'work hardening' in the context of PDR, and why is it significant?

Accepted Answer

The process of metal becoming stronger and less ductile after repeated deformation

Answer

A finishing polish applied after repair

Answer

Applying heat to soften a dent before repair

Answer

Using a harder tool for deeper dents

Question 3

High-Strength Steel (HSS) panels are increasingly common in modern vehicles primarily because they:

Accepted Answer

Reduce vehicle weight while maintaining crash-safety ratings

Answer

Are cheaper to manufacture

Answer

Are easier to repair with PDR tools

Answer

Have a higher aluminum content

Question 4

When performing PDR on an aluminum panel, which characteristic most distinguishes it from working on steel?

Accepted Answer

Aluminum has lower elastic memory and work-hardens faster than steel

Answer

Aluminum is magnetic, making tool placement easier

Answer

Aluminum panels are always thicker than steel equivalents

Answer

Aluminum responds better to heat lamps during repair

Question 5

The 'spring-back' effect in metal panels refers to:

Accepted Answer

The tendency of metal to partially return toward its deformed shape after force is released

Answer

A panel popping out after a PDR rod is removed

Answer

The bounce of a glue tab during glue pulling

Answer

A crack forming along a sharp dent crease

Question 6

Ultra-High-Strength Steel (UHSS) panels are generally considered:

Accepted Answer

Poor candidates for PDR because the metal is too brittle to massage without cracking

Answer

Ideal candidates for traditional PDR rod work

Answer

Easier to repair because they have more elasticity

Answer

Interchangeable with mild steel in PDR procedures

Question 7

What does 'panel gauge' refer to and how does it affect a PDR repair?

Accepted Answer

The thickness of the metal panel, which affects how much force is needed and how the metal responds

Answer

The color code used by auto manufacturers

Answer

The number of body lines on a panel

Answer

The distance between the panel and the frame