Back in January, Cadillac revealed the new manufacturing process that would be used at the Detroit-Hamtramck Assembly plant to build the 2016 Cadillac CT6, and now it is releasing a few more details about what its all-new flagship sedan is made of. As shown in the image provided by Cadillac, most of the CT6’s passenger compartment is made of steel, while the engine compartment, trunk, roof and rocker panels are aluminum. In total, this “aluminum intensive” structure will be composed of 64 percent aluminum.

Bonding the aluminum and high-strength steel together is what requires Cadillac’s patented manufacturing process, and it will include welding, rivets and adhesives. While more challenging, this process helps make the 2016 Cadillac CT6 lighter, quieter and more rigid. These are all elements that the CT6 will be required to possess if Cadillac plans on making any real run at the full-size luxury sedan segment.

Cadillac revealed a teaser of the 2016 Cadillac CT6 in a commercial for the Oscars last month, but the new sedan will be officially unveiled on March 31 at the New York International Auto Show ushering in a new naming convention for Cadillac as well as a new level of luxury and quality.

Continue reading to learn more about the Cadillac CT6.

Why it matters

The mix of materials that will make up the body structure of the 2016 Cadillac CT6 will help the save almost 200 pounds compared to all-steel construction. Shaving so much weight is not only necessary in order to maximize fuel economy, but it will also improve the sedan’s driving dynamics – something it will definitely need when going up against the Mercedes S-Class and Audi A8.

Cadillac CT6

2016 Cadillac CT6 Exclusive Renderings
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Jeffrey N. Ross
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Press Release

Cadillac will use an advanced mixed-material approach for the lightweight body structure of the upcoming CT6 range-topping sedan. The structure is aluminum intensive, but the new Cadillac also includes 13 different materials customized for each area of the car to simultaneously advance driving dynamics, fuel economy and cabin quietness.

The CT6 will debut March 31 at the New York International Auto Show and go into production late this year at General Motors’ Detroit-Hamtramck assembly plant.

“This is the rocket science of automobile construction and manufacturing today,” said Cadillac President Johan de Nysschen. “With the CT6, we used high-strength aluminum and high-strength steels; lightweight chassis components; we integrate aluminum and steel where it makes sense; we eliminate every gram of mass possible, while achieving world-class performance.”

Weight reduction helps improve fuel efficiency, contributes to desirable vehicle dynamics and aids in creating a more resilient passenger cell. Sixty-four percent of the CT6 body structure is aluminum, including all exterior body panels – and the mixed material approach saved 90 kg (198 pounds) compared to a predominately steel construction.

Thirteen complex high-pressure die cast components make up the lower structure of the CT6 body, along with aluminum sheets and extrusions. The vehicle underbody uses steel close-out panels on the lower structure to create a bank vault-quiet cabin without the added weight of extensive sound-deadening material, often used to compensate for aluminum panels in the occupant compartment.

“The structure of the CT6 is one of the most-advanced body systems we’ve ever produced,” said Travis Hester, Cadillac CT6 executive chief engineer. “The innovation surrounding our joining techniques have enabled us to create a vehicle structure with the highest torsional rigidity of any Cadillac while achieving one of the most mass-efficient vehicles in the segment.”

Cadillac in January revealed a series of high-technology material joining techniques that create a new methodology for assembling the CT6. These enabled engineers to design a completely new structure for which 21 patents are pending.

“This new construction approach has enabled us to produce a world-class vehicle that is larger in size and includes more standard equipment while achieving lower overall mass,” Hester said.

High-strength steel is used strategically to reinforce the body structure, and is also used in conjunction with high-strength aluminum to create a safety cage surrounding the occupants.
The structural portion of the B-pillar is constructed completely of high-strength steel, which was chosen to aid vehicle ingress, egress and visibility, in addition to mass savings and added cabin quietness.
A high-strength aluminum impact bar was added to the rear of the vehicle, and a combination of high-strength aluminum and steel was used for front and side impact zones to further increase passenger safety in the event of collisions.

A combination of aluminum spot welds, steel spot welds, flow drill screws, self-piercing rivets, laser welding, aluminum arc welding and hundreds of feet of structural adhesive are all used in assembling the body of the CT6.

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