I don't know that there is a minimum length expressed in AISC. I don't have it handy to look at right now. If it is just a few mm you can just add by welding. Longer measurements you add by splicing.
Ultimately Marshall is correct, you must get it approved by the engineer. Just ask them how they want to deal with it.
BUT, I'm curious. You haven't told us the exact material such as tubing, wide flange beam, etc. or it's size. But regardless, I find it odd that you are using what in my USA mindset is a 20' piece when you need 20'-5" (probably not exact, just some quick calcs). Why don't you just order longer material and cut it to length instead of spending the time and money to cut anyway, prep for CJP, weld, and UT. Doesn't sound cost effective to me.
Have a Great Day, Brent
Dear Marshall, Brent,
Your answers are very useful for me, it's clear up for my work to be practices and inspections in our shop.
Thank you very much.
Hi BST,
in addition to the great advice given already......
When we have to splice a short piece back on due to a shop error or customer change, I like to have,at a minimum, splice enough material back on to be able to scan in 3 legs with the 70° degree transducer...Keep in mind thickness of the flanges usually dictate what that dimension will be....that also gives enough wiggle room for the 60° and 45° if needed.
Hope this helps,