Calibration of stud welding equipment

What is calibration?

Calibration means determining and documenting the deviation of the value displayed by a stud welding machine from the correct value of the measured variable. We measure the difference between the measured value of the output variable of a machine and the associated input variable. A calibration does not involve any intervention that changes the stud welding machine. The determined measurement deviations can be used to correct the indicated welding values or check whether deviations are within defined error limits. 

Why should I calibrate my machine?

  • To satisfy current quality assurance regulations
  • To achieve reproducible and reliable welding results
  • To objectively assess the welding process with physical variables
  • For traceability based on national and international standards
  • For product liability (documentation for a potentially required exemption from liability).

Is the calibration based on certain guidelines?

Our calibrations are based on the following standards and guidelines 

  • DIN EN ISO 17662 – “Welding - Calibration, verification and validation of equipment used for welding, including ancillary activities” 
  • DVS Leaflet 3009 – “Calibration of welding current sources” 
  • DVS Leaflet 3009 Supplement 1 – “Calibration of current sources – Stud welding machines” 
  • DVS Leaflet 0714 – “Welding manufacturer requirements for the calibration of welding equipment” 

Our specialist welding engineers have the necessary qualification, experience, and training in welding and measurement technology. We also use independent measuring equipment.

How often does my machine need to be calibrated?

The frequency at which a machine needs to be recalibrated depends on the relevant regulations in the operator’s industry and country. Compliance with these requirements is the operator’s responsibility.

If machines need to be calibrated, verified, or validated, this must take place once a year in line with “DIN EN ISO 17662”, unless otherwise indicated. We therefore recommend annual calibration.

At what point does my machine need to be calibrated?

Your machine should be withdrawn from use and calibrated as soon as possible in the following cases: 

  • If there are signs that the machine’s display is no longer working correctly
  • If the equipment is visibly damaged and the damage may have an influence on the function of the machine
  • If the equipment has been used incorrectly, in case of heavy workloads (overloads, etc.) or events that may have damaged the machine
  • If the equipment has been repaired (KÖCO carries out a calibration after every repair; in this case, calibration documentation must be specifically requested)

Is a calibration the same as an adjustment?

Adjustment involves setting or adjusting a machine such that parameter deviations are prevented to the extent necessary to pass a calibration. A calibration does not involve an adjustment. 

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