Hey Slowchild!
Have you ever even "walked the cup"? on pipe or tubing?
Because if you've never attempted to do so, then you should'nt question the method without having any experience in doing so!!!
My advice to you son is to practice how to crawl first before you get to learn how to walk -the cup!!!
When you get to HIWT, they'll show you how to do it -then you can give your educated opinion but, until then act like a sponge and practice,practice, and practice some more...
When you get tired of practicing so much, that's when you know that you've got to practice some more and, when you think you're done practicing, you need to remember that for the rest of your career as a welder you must continue to practice in order to avoid complacency!!!
P.S. Hey Gerald! hows the ankle doing? I pray that your doing better friend because I know how bad it feels when you ca'nt perform at 100%!
Please take my advice not to rush yourself back into action too soon so that the ankle heals completely because, I made that error in judgment awhile back with a different but nonetheless disabling injury and ended up right back where I started -disabled... Lesson learned!!!
Respectfully,
SSBN727 Run Silent... Run Deep!!!