First off drpmcwi, "WELDCOME TO THE WORLD's GREATEST WELDING FORUM!!! :) :) :)"

Now, as far as you being able to inspect work to AWS D1.5 is concerned, as long as the contract docs and the customer accepts you as a CWI wh tested to D1.1, then there is nothing written that prevents you from performing VT and any other AWS CWI work on a D1.5 job... However, if the EOR, contract docs, and the customer requires someone who initially tested to any code in order to achieve CWI status other than D1.5 also has to have an additional AWS D1.5 endorsement in order to perform the expected duties on a particular job, then you will be required to have earned the AWS D1.5 additional endorsement qualification besides what you already have earned as a Certified Welding Inspector.

So it all depends on the specific job requirements set forth by the client and if there are none at all for a particular job, then you don't even have to be a CWI either!!! ;) Clear as mud eh??? :) :) :)

Respectfully,
Henry

drpmcwi
First as Henry has stated,
"WELDCOME TO THE WORLD's GREATEST WELDING FORUM!!!
Here is a story.
About 8 years ago I was a welder and foreman for a company that was required to be AISC Certified Simple Bridges to build a 200 foot pedestrian Walkway. We had applied and submitted procedures to AISC but were awaiting our Audit to be actually Certified.
To appease the State we were required to have an inspection firm from Penn. audit our shop and quiz me on the way we did things.
Since the main members was Hollow Structural Steel which AWS D1.5 does not cover we were to refer to D1.1 for welding.
I wasn't an AWS CWI but we submitted documentation of my experience and training and I was approved by the State Department of Transportation as qualified to act as our companies CWI for the project. I hadn't went to Miami and took my test yet.
When You took your CWI exam you became an AWS CWI You are not a CWI for just D1.1 You are an AWS CWI to inspect AWS Coded Work. If you have an AWS code book you can inspect, if you have the owners agreement you can inspect, you have shown your ability to read and find pertinent information to the tasks as required by AWS.
But as mentioned here the Owner or their Representative can clarify if you are in question. But I would wait for them to question your abilities.
Just My ¢¢'s
Again Welcome to the Forum
Marshall

My understanding about that is this: 

For the time being, a CWI certification is a CWI certification and with no restrictions on the code or codes you can inspect to.

There had been some talk about putting some restrictions on the CWI certification according to the code you test with but that hasn't happened so far.  What was being said was that if you test with D1.1 then you could inspect to any code - presumably because D1.1 is "more complicated".  I think ASME IX was another "complicated" code that would qualify for any code.

I think this was because some CWI's had tested with API 1104 which some felt was too easy because it was only 37 pages long (I don't know how many pages it is now.  Some had the opinion that it gave an advantage in passing the test, but left the CWI without a working knowledge of how to use another code.

Frankly, I don't see that it makes a big difference (I don't think I've used more than 37 pages of D1.1 for quite a while now).  The person's abilities, rather than what code was used for the test, would seem to be more important.

Hey drpmcwi, Another Cert you might want to consider is the ASNT-SNT-TC-1A Level II VT certs. The reason I say this is because there is alot of Nuke related work coming up and alot 'If not all' of the clients are requesting this Cert along with CWI. Also beefs up your resume. It's pretty simple, Just fill out the paper work (Printed off of their website) and mail it in along with a current mug shot and I think i'ts $250.00.

Just a thought .