To Boon
As long as your welding processes & electrical parameters as essential variables are within tolerances of the original WPS essential variables, and all other essential variables stay the same then there's no need in certain circumstances to write up an entirely new and separate WPS ...But, like Al has already mentioned it depends on the category of repair he has previously posted... And if I were in your shoes, just to CYA or rather to CMA, I would run it by the engineer because there could be some factor(s) where the engineer may become skeptical about going ahead and making the repair(s) without considering a factor or two which may not be so obvious to either of us and certainly not within our pay grade...
Like Al & Brent mentioned, the first poster's query is not a typical welding repair scenario simply because of the type of alloy being used that will not keep the same metallurgical properties desired for the designed structure if performed by using a typical repair method... So if a repair is applied that isn't carefully thought out by considering all of the possible ramifications which could occur... And if there's no control of the heat input, possible heat treatment required and other factors that must be taken into account in order to achieve a successful repair that meets and possibly exceeds everyone's satisfaction... Then an invitation to failure could be the end result... And if failure is unacceptable which should be everybody's mantra, and yet is permitted then the ripple effects could be catastrophic in many ways IMHO.
In other words, I was taught by some of the best supervisors and general foreman in the business @ EB that: "All repairs are not to be treated lightly because the long term effects could mean either the boat doesn't get to the wet dock on schedule which would make the company lose a whole bunch of money to possibly killing someone or everyone in our case... So son! Failure is not an option! Carry on!" They also taught me this: "Son, if you're not sure come look for one of us so we can run it by engineering and see what they want us to do, and this is how you must consider any job that you may have a question about how to perform the work or the repair... Basic GM
P lolol!
Respectfully,
Henry