[WHughes]

Camorobb, I have ua 60, 63 and 67. 22 is the same as 63 except its the super coupon. I once tried the 3/32 gap and was promptly scolded. Go to 1/8 gap and 1/8 rod at 98 to 100 amps. I use a #6 or7 cup for this with about 3/16 of stick out and works great. The instructors in my UA shop are some of the best in the country.
good luck

 

[WHughes]

UA21 and 22 are tests on schedule 120, and the super coupon is schedule 160 and super cedes all the other. Its just basically a unlimited thickness cert and you will most likely not weld pipe like that very often. Its like an endurance test.