HLAVÁČEK, J., M. KNĚNICKÝ, and K. DRAXLER. Calibration of unipolar high current impulses for resistance spot welding. In: MÜLLER, Z. and M. MÜLLER, eds. 2020 21st International Scientific Conference on Electric Power Engineering (EPE). Prague, 2020-10-19/2020-10-21. Prague: Czechoslovakia Section IEEE, 2020. ISBN 978-1-7281-9479-0. DOI 10.1109/EPE51172.2020.9269221. Available from: https://ieeexplore.ieee.org/document/9269221
Requirement from practice is the need for quality and precise measurement of unipolar high current impulses, which are applied in resistance spot welding. The reason is the high dependence of weld quality on the shape and energy of applied current impulses. A new calibration method for this current impulses without disconnecting the current circuit of a resistance welding machine is required. Review and selection of suitable noninvasive current sensing devices have been made. Frequency analysis of typical unipolar current welding impulses was performed as well. The following measurements of chosen sensing devices with Hall sensors and special magnetoresistance sensor verified the necessary frequency bandwidth of the sensors. Verification measurements of unipolar current impulses were carried out as well. Finally, the uncertainty of the calibration method with a noninvasive current sensing device has been determined.
eng
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Czechoslovakia Section IEEE
dc.relation.ispartof
2020 21st International Scientific Conference on Electric Power Engineering (EPE)
dc.subject
Current impulse
eng
dc.subject
current measurement
eng
dc.subject
impulse measurement
eng
dc.subject
calibration
eng
dc.subject
precise measurement
eng
dc.subject
unipolar impulse
eng
dc.subject
welding
eng
dc.title
Calibration of unipolar high current impulses for resistance spot welding