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

Mild steel's high ductility and malleability allow it to be pushed and massaged back into shape without cracking, making it ideal for PDR.

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

Work hardening occurs when metal is repeatedly deformed, increasing hardness and brittleness, which limits how much a PDR technician can massage a dent before cracking risk rises.

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

HSS allows automakers to use thinner gauges that weigh less but still meet crash-safety standards, improving fuel economy without sacrificing structural integrity.

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 has less elastic memory and work-hardens more rapidly than steel, requiring the technician to use lighter, more controlled strokes and work progressively from the edges.

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

Spring-back is the elastic recovery of metal after force is removed; PDR technicians must slightly over-push to compensate for this effect.

PDR - Paintless Dent Repair Technician Certification Practice Test

PDR - Paintless Dent Repair Technician Certification Practice Test

PDR Vehicle Panel Metallurgy & Body Structure