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Honda’s challenge was to replace a conventional, multi-piece spot-welded door ring with a single-piece laser-welded design. Their goal was to protect passengers, while optimizing weight, cost, and safety of the door ring.
Working with Honda R&D Americas, engineers from ArcelorMittal and ArcelorMittal Tailored Blanks developed a single-piece, hot-stamped door ring using Usibor® 1500. This advanced high strength steel enabled Honda to reduce the weight of each door by 3.9 kilograms (6.6 pounds) and increased the vehicle’s fuel economy. The redesigned door offers improved energy management through uninterrupted joints for a smooth load path.
“The entire structure around the doors are made with this super strong high-strength steel. To our knowledge, we are the first and only people that apply hot stamping in this way. [Despite it] being a much stronger, safer car, it is 275 pounds (125 kilograms) lighter than the outline car.”
Jim Keller, 2014 Acura MDX Chief Engineer
The new Honda Acura door ring received the highest available safety ratings and awards including:
- IIHS Top Safety Pick+, including a top rating for the new small overlap crash test
- 5-Star Overall Vehicle Score by the National Highway Traffic Safety Administration (NHTSA)
- 2015 PACE Award (Automotive News)
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© Honda
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© ArcelorMittal
The single-piece door ring was made with Usibor® 1500, one of the latest advanced high strength steels from ArcelorMittal
© IIHS
Crash test of the Honda Acura MDX door ring (right) shows significantly less deformation than the comparison vehicle (left)
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