ISO 17662:2005 specifies requirements for calibration, verification and validation of equipment used for:
control of process variables during fabrication
control of the properties of equipment used for welding or welding allied processes,
where the resulting output cannot be readily or economically documented by subsequent monitoring, inspection and testing. This regards process variables influencing the fitness-for-purpose and in particular the safety of the fabricated product.
The subject of ISO 17662:2005 is limited to calibration, verification and validation of equipment after installation, as part of the workshops' schemes for maintenance and/ or operation.