I-CAR - Inter-Industry Conference on Auto Collision Repair Certified Advanced Materials and Joining Questions and Answers

Question 1

A technician must join a new galvanized Ultra-High-Strength Steel (UHSS) B-pillar reinforcement panel to the existing vehicle structure.
Which of the following joining methods is often specified by OEMs for this repair, and what is the primary reason for its use?

Accepted Answer

Silicon bronze MIG brazing, because its lower heat input preserves the steel's microstructure and protective coatings.

Answer

GMA (MIG) welding with ER70S-6 wire, because it creates the strongest possible fusion weld.

Answer

Resistance spot welding, because it is the fastest method and perfectly duplicates factory appearance.

Answer

Oxy-acetylene brazing, because it allows for precise heat control and requires no special equipment.

Question 2

When using heat to assist in straightening a minor bend on a structural 6000-series aluminum alloy component, what is the generally accepted maximum surface temperature to avoid annealing and permanently weakening the part?

Accepted Answer

Below 250°C (482°F)

Answer

Between 300°C (572°F) and 400°C (752°F)

Answer

Between 450°C (842°F) and 550°C (1022°F)

Answer

Up to 660°C (1220°F), just below the melting point

Question 3

A technician is inspecting a newly installed Self-Piercing Rivet (SPR). Which of the following is a critical feature to check on the die-side (backside) of the panels to confirm a proper installation?

Accepted Answer

A well-formed, crack-free 'button' is present, and the rivet has not pierced the final layer.

Answer

The rivet head is perfectly flush with the top panel surface.

Answer

A small puncture or crack is visible in the center of the button.

Answer

The rivet tail has pierced completely through the bottom panel.

Question 4

In modern unibody construction, structural adhesives are often used in conjunction with spot welds or rivets along panel seams. Beyond simply bonding the panels, what is a primary function of the adhesive in this hybrid joining method?

Accepted Answer

To increase panel stiffness and help dampen Noise, Vibration, and Harshness (NVH).

Answer

To act as a temporary holder for panels before welding.

Answer

To provide a heat shield protecting the steel during the welding process.

Answer

To fill cosmetic gaps between panels for a better paint finish.

Question 5

Which of the following describes a critical limitation when considering a repair to a structural carbon fiber component that has suffered an impact causing suspected delamination?

Accepted Answer

The full extent of internal delamination can be difficult to assess, making it hard to guarantee the component's original strength.

Answer

The component cannot be repainted to match the factory finish.

Answer

Standard polyester body fillers will not adhere to the carbon fiber surface.

Answer

Specialized heating lamps are required to cure the repair materials.

Question 6

What is the primary advantage of using silicon bronze MIG brazing instead of traditional GMAW (MIG) welding on Ultra-High-Strength Steel (UHSS) components?

Accepted Answer

The lower heat input preserves the steel's strength and protective coatings.

Answer

MIG brazing wire is significantly less expensive than steel MIG wire.

Answer

The resulting bronze-colored joint is easier to see for inspection.

Answer

MIG brazing can be performed with a standard 120V welder.