http://www.aws.org/pr/apr7-2005.htmlcorrect me if I'm wrong but the U.S open weld trials I thought were seperate from skills USA and their welding competition and open to everyone. I think they hold it every year at the AWS fabtech show.
also the competition is extremely good, my last school was very big in competing the kids would practice 60+ hrs a week for a full semester. WE have samples mounted on the wall from each of the state and USA winners and it's very pretty.