Sorry I can't answer that question seeing how I have little experience in welding (which the most experience I've gotten is Acetylene and Oxygen).
But speaking for 1501 we use aluminum sheet metal and rivets to make most every robot using an engineering style known as monocoque (used in airplanes, vehicles, spacecraft, race cars). A simple effective style requiring primarily hand tools and few larger pieces of equipment such as a bench press.
Quote:
Originally Posted by Andrew Schreiber
If I recall correctly Kettering's Formula Zero team (hydrogen powered car) is using a similar chassis. Ours is a little smaller due to race restrictions though. Something tells me 1501 used welded 4130 in 2007 for their chassis.
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In 2007 AND 2008 both used welded 4130 Chrome molly. 2008 we used the Chrome Molly as a track for our "slingshot" launching method. We welded tabs on the Chrome Molly frame to attach our monocoque pieces on those 2 robots.