DXGL
We calibrate for compliance with D1.5 Section 4.26 which covers both FCP and non-FCP. We use FCAW for "run-of-the-mill" fabrication and welding, and SAW for heavy stuff or girders.
SAW isn't bad to calibrate since 1000 amp power supplies and sub arc tractors really aren't that portable and the welding parameters are very stable, at least with automatic welding.
Our FCAW equipment is tougher because it is more portable making it easier to switch equipment around. I record machine & wire feeder serial numbers on my cal records but 3 months later I'll find quite a few swapped around.
We don't use much SMAW which is a good thing because our machines only have dials, no meters.
I do realize it is important to be able to control heat input (A, V, and IPM) for many situations. But on a personal note, I really dislike "calibrating" machines used for manual and semi- automatic processes. Especially on a 3 month basis; and knowing that even though we try to use "average" conditions, every welder will run differently. Even if I locked the controls with FCAW, just having different ESO (stickout) will significantly change amperage, even if the ESO is within allowable limits. And forget trying to develop a chart to allow for variances, it hasn't worked so far. I would much rather calibrate machines when the situation warrants it.
To quote the good sense used in other posts, I'll get down off my soapbox now. I hope I answered your question without going too far overboard.
CHG