There was a fairly long article in The Wall Street Journal on how the car makers are using new kinds of adhesives to glue and rivet cars together, to reduce weight. This is being done with aluminum and steel. One problem with aluminum is that it's hard to spotweld.
"Super Glue Holds Your Car Together - Those Aren't Bolts Holding Your Car Together", James R. Hagerty and Mike Ramsey, page B1 of the 9 September 2014 issue of the WSJ.
Unfortunately, it's behind a paywall, but just about every library in the country gets the WSJ.