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Copyright 2004, TWI Ltd

World Centre for Materials Joining Technology

TWICSWIP 3.1

WIS 5WELDING INSPECTION

CALIBRATION

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Calibration/Validation

BS 7570: 1992 Covers the calibration andvalidation of welding equipment.

Grade 1 (general purpose equipment) all

parameters should be +/- 10%.

Grade 2 (Automatic or automated equipment)parameters should be +/- 2.5% for current

and +/- 5% for all other parameters.

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Calibration/Validation

Calibration can only be done on equipment with

meters or gauges as theses can be adjusted.

Validation can be done on equipment with and*without meters or gauges.

Oil fill transformers etc.

All equipment can be Validated but not all equipment

can be Calibrated.