PDR Vehicle Panel Metallurgy & Body Structure 2

Question 1

Which type of vehicle panel construction most commonly uses a sandwich of two steel skins bonded to a core material?

Accepted Answer

Composite or laminated panel construction

Answer

Laminated or composite panels use two thin metal skins bonded to a structural core (often adhesive or foam), which can delaminate during aggressive PDR attempts.

Question 2

A technician notices that a hood panel has a distinctly different 'push feel' than expected — spongy rather than firm. This most likely indicates:

Accepted Answer

The panel is a bonded composite or has delaminated inner layers

Answer

A spongy feel under the rod typically signals a composite or laminated panel where the inner bonding has failed or separated, requiring a different repair approach.

Question 3

Why is heat application (e.g., heat gun or heat lamp) sometimes used before PDR on aluminum panels?

Accepted Answer

To temporarily restore ductility and reduce work-hardening effects, making the metal more workable

Answer

Carefully applied heat can relieve work-hardening in aluminum, temporarily restoring ductility and allowing the technician more working cycles before the metal fatigues.

Question 4

The 'grain direction' of a metal panel is most relevant to PDR because:

Accepted Answer

Working against the grain can cause micro-tears, while working with the grain allows smoother metal movement

Answer

Steel is rolled in a specific direction during manufacturing, creating a grain; pushing metal with the grain yields smoother deformation, while working against it increases cracking risk.

Question 5

Which term describes the permanent deformation zone of a metal panel where it has been stretched beyond its elastic limit?

Accepted Answer

Plastic deformation zone

Answer

The plastic deformation zone is where metal has been permanently stretched beyond its yield point; PDR works to reshape this zone without adding further stretch.

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PDR Vehicle Panel Metallurgy & Body Structure 2