Using documents that you actually approved during your tenure there is one thing but applying your signature after you left is an entirely different thing. Submitting such documents for new re-certifications is a problem too if you are not there to monitor that the things you signed off on are still accurate.
I think that a cease and desist sort of letter would be something that should be done at a minimum. Make sure they are aware of your knowledge they are doing it and that it is in no way acceptable to do so and they need to stop doing it immediately and retract any documents they have that were falsified in this way.
Depending on your relationship with the employer you may be able to work with them and review any documents that have had this happen and then approve or deny them as a contractor type of role. This has its own risks, in a way it is being lenient in regards to this situation. Again depending on your relationship with the employer and if you have any trust in them at this point.
I am betting that AWS has things in place to deal with this kind of situation I would think. If nothing else, if some sort of satisfactory situation cannot be achieved, then I am pretty sure there are legal options that can be taken.
Admittedly my view on such things does not leave much room for compromise. As far as "debt and obligation" matters are concerned somebodies signature is a binding thing and falsifying that is a horrible thing to do.
Good Day,
What code is this in reference to?
Is it a code, company policy, or customer requirement for these being signed by a CWI?
When you qualify a welder then leave the employer, they can have anyone with designated authority attest to continuity.
Qualifying NEW welders and using a form with your signature and stamp would be completely different. Even then, usually welder quals are not required to be performed and attested to by a CWI.
So many questions.
Have a Great Day, Brent