I would not recommend it.  I worked for 8 years as an automotive resistance-welding engineer responsible for body integrity.  All of the big three spent millions of dollars on NDT research in hopes of finding a QA method that would eliminate body teardowns.

Guess what?  Today, they are still doing physical body teardowns.  The closest method was UT, but it is EXTREMELY sensitive and takes a super expert to interpret.  The big problem comes with zinc-coated materials.  If a process is too cold, what I used to call a "stick weld" usually occurred.  In such a weld, just the zinc layer would bond, and there was no weld nugget.  It would pass an x-ray and especially a UT NDT test, but break in two if just dropped on the floor.

Now, maybe if you are talking about non-coated materials there is some hope, but I would only suggest having a good consulting lab do this work, and destructive tear downs would still be required to establish some kind of "good/bad" calibration standard. 
If it were I, I would just sacrifice a few of the parts and do the teardown and be done with it. 

I know of a case where one of the big three had a resistance weld process go out of whack. Since the welds were suspect, the liability was high, and there was no NDT method to verify, they just decided to scrap a whole days production!  Yes it happened!  They scrapped 200 new cars with window stickers waiting to go out from the shipping lot!