I am looking for any info on the UA 21 plumber weld test. Not sure what it is with the AWS. I am a sheet metal worker who has an oppturnity to work for the plumbers for awhile but need to pass a ua21 test. Its 2" sch 80 pipe in 6g position. 6010 root and 7018 cap. I have a 6" tig root 7018 fill that I passed with two days practice. I also have a 1.1 for flux and stick, and my sheet metal 9.1 I dont have anyone im my local that has taken the test to talk to and I cant just call the plumbers and talk with them all day. I am looking for info on what size rod is used, tack size and prep if any, weld technique, how many passes, amprage, and any other info one may have. Thanks for any help.