What does validation and calibration mean?

Validation 

Confirmation - through the provision of objective evidence – that the requirements for a specific intended use or application have been met.

Purpose
Determination whether the welding equipment is suitable for the intended purpose.Tolerance requirements can be set by the customer and still comply with the EN50504.

 

 

 

Calibration

Determination of the accuracy of the measurement intruments.

Purpose
The measurement instruments accuracy are checked to +/- 2.5% of maximum values.Tolerance requirements are in accordance with EN60974-1 - EN17662 and EN3834-2

 

Note: When doing a validation of the complete welding equipment, this also includes at the same time, calibration of attached or build in instruments.

WHEN DO I NEED TO VALIDATE?

In general, calibration of welding equipment instruments (e.g. ammeters, voltmeters) is only required when the quality/repeatability of the weld depends on accurate and repeatable setting of parameters such as current, voltage, speed, gas flow, pulse characteristics, etc.

In the schematic* below, you can find help on when to validate/calibrate.

 

Heat input is controlled by
check of run-out-length
and/ or weld run cross section.

Use visual inspection, intuition and experience.

Validation/calibration can be chosen.

 


 

Validation/calibration is necessary.

 


 

MMA

X

X

 
MIG - TIG - PlasmaTIG
(non puls hand welding)
 

X

 
MIG pulse and FCW 
(hand welding)
   

X

MIG - TIG - PlasmaTIG
(on automats)
   

X

Equipment used for  WPS    

X

Plasma cutting

X

   

*Information is taken from ISO 17662

HOW OFTEN DO I NEED TO VALIDATE?

  • Minimum once a year according to EN50504
  • When the equipment has been rebuilt or repaired.
  • Whenever there are indications that an instrument does not register properly.
  • Whenever the equipment has been visibly damaged and the damage can have influenced the function of to one or more instruments.
  • Whenever the equipment has been misused, subject to severe stress (overloads, traffic accidents, etc), or subject to any other event which can have resulted in damage to one or more instrument.

EURO NORMS

Metal fabricators who are following ISO 9000:2000 will experience that various norms are becoming relevant. Each norm has reference to other norms and end up with EN 50504 and the validation certificate.

EN 50504 describes a strict way to perform the validation, and this method is suitable for most applications. Less strict ways of validating arc-welding equipment might be suitable for some customers, but these methods are not covered by this description. 

Also SAFETY TEST and maintanence SERVICE CHECK are nessesery when servicing arc welding equipment.

Contact Migatronic Service for further details

techsupport@migatronic.com