This part of ISO 17657 specifies equipment for the calibration of measuring systems of welding current and indicating weld time in resistance welding using single-phase alternating current of frequency 50 Hz or 60 Hz, or direct current. The guidelines define various basic terms for the measurement of welding current, and give some basic information for users of welding current measuring systems including welding current meters with current sensing coil.
BS ISO 17657-1:2006 history
2006BS ISO 17657-1:2006 Resistance welding - Welding current measurement for resistance welding - Guidelines for measurement