GemmellG;
None that I am aware of. Keep the welder continuity list handy, and have calibration records on any devices related to measuring/verification based on your Quality Manual. It should be straight forward. Good Luck.
The only time I have seen calibration of the welding machine itself come up as a problem is when the company writes itself into a corner with its OWN procedures: For example, they write a WPS or a specification up that requires "Every welding machine will be calibrated every year IAW procedure xxxyyy.123. " Or "Calibrate the welding machine against a calibrated ammeter before every job, and twice monthly thereafter."
See, in each of those cases, the company could be required to produce those records showing it was following its own procedures ... even though every welder and every supervisor knows they never have done so, and don't even have an ammeter in the building.
In practice, the weld current - which is the only thing that "could be" calibrated, is going to change every job with the tungsten thickness, electrde diameter, heat load, distance from the weld, feedrate, etc.
I've always found this requirement rather comical in its application. On older style machines the volt meters are accurate and the ammeters are highly inaccurate, essentially random number generators. The next (disastrous) thing that happens is that the welder is forced by a bespoke-suited auditor to work such that the meters are reconciled with the WPS parameters. Fail. When it is carbon steel with no special requirements I don't bother the welder unless the inspector finds an issue with quality or the foreman with productivity.
On newer inverter machines the digital instrumentation is generally quite good and there is really no 'calibration' possible or necessary.
Whatever else you do, set up a program and generate records.
