AUDI Material Selection & Properties 2

Question 1

Audi uses hot-formed ultra-high-strength steel (UHSS) in structural areas primarily because it offers:

Accepted Answer

Tensile strength exceeding 1,500 MPa with reduced weight

Answer

Hot-formed UHSS achieves tensile strengths above 1,500 MPa, enabling thinner gauges that reduce vehicle weight while maintaining crash performance.

Question 2

Which welding process is typically required when repairing Audi's press-hardened steel (PHS) components?

Accepted Answer

Resistance spot welding only, per OEM specifications

Answer

Press-hardened steel must be joined using resistance spot welding at OEM-specified parameters to avoid heat-affected zone embrittlement.

Question 3

Audi's Audi Space Frame (ASF) design uses aluminum extrusions joined to cast aluminum nodes. What property of aluminum castings makes them suitable for these nodes?

Accepted Answer

Ability to form complex three-dimensional shapes with integrated attachment points

Answer

Cast aluminum nodes can be produced in complex 3D geometries that integrate mounting points and load-transfer features impossible to achieve with extrusions alone.

Question 4

When Audi specifies a 5xxx-series aluminum alloy for a body panel, what is the primary alloying element?

Accepted Answer

Magnesium

Answer

The 5xxx-series aluminum alloys use magnesium as the primary alloying element, providing good corrosion resistance and moderate strength.

Question 5

Which material property is most critical when selecting a brake disc material for an Audi high-performance application?

Accepted Answer

High thermal conductivity and heat capacity

Answer

Brake discs must absorb and dissipate large amounts of heat rapidly, making thermal conductivity and heat capacity the primary selection criteria.

(AUDI) Audi Certified Mechanic Practice Test

(AUDI) Audi Certified Mechanic Practice Test

AUDI Material Selection & Properties 2