Ah, Yes. ASTM has a hugely expensive set of "Reference Radiographs" whose use is controlled by section E486. I have a set for "Steel Castings, Up to 2 inch" and a set for "Steel Castings, Greater than 2 inch". I believe there are similar standards for forgings and non ferrous materials, but I have never seen any where a specific product was used to develop them (no pun intended). I think pattern welded barrels predates ASTM and radiography in general, and their manufacture pretty much ceased before the technique was developed.
Most Level III examiners also maintain their Level II proficiency (sounds odd, but true) as it's the Level II who does, and interprets the procedure, under a quality manual or program written by the Level III. I was a II and III for RT, UT and MT, and oversaw the QA & QC at my company before I moved up to Mgmt (end of the fun part of my career)
In order to develop a set of standards, it would be necessary to accumulate samples with representative defects, like inclusions, gas, slag, linear and non-linear cracks, etc. These would also have to include levels of severity; kind of a go-no go set. Unless they have come up with a way to reproduce radiographs, each set of standards would have to be made from actual shots of the standards. The governing body maintains the samples (sort of like NIST I guess)
I suspect this is really boring for the bulk of readers.
|
Threaded Mode