In an effort to adhere to strict new vehicle fuel efficiency standards, requiring that the U.S. auto fleet average 54.5 miles per gallon by 2025, American auto manufacturers are attempting to shed vehicle weight any way they can.
Ford has developed a new welding process that can drop more than 6 pounds per engine built. Plasma transferred wire arc(PTWA) uses the electricity in a plasma cloud to vaporize metal wire that is then sprayed on to the cylinder walls of the engine block. Ford has licensed the process to Nissan for use in fabricating the GT-R.
GM has started using a mixed-materials approach in an attempt to drop weight. For the first time in the industry, they are welding steel sections to aluminum parts. Read more here.