EN 1090 does not require annual calibration of welding equipment or parameter readings. How often welding equipment calibration is performed is determined by you, the user. However, welding equipment and all reading and measuring devices that can influence product quality, should be checked regularly. Per EN 1090, inspections and maintenance shall be carried out and recorded in accordance with the manufacturer’s written procedures, and records must be maintained for the period defined in the manufacturer’s factory production control procedures. ESAB’s unique True Arc Voltage™ system ensures that displayed welding parameters can be compared to the WPS.