Rogowski current transducer applied in data collection of for resistance spot welding
Jianhong Chen · 2004
The Rogowski coil current transducer consisting of a flexible 'air cored' toroidal winding and an integrator is applicable specifically to the secondary current detection in resistance welding process, due to the its operation principle and structural feature. The operation principle of the Rogowski coil, design and error of the electronic integrator, circuit model and sensitivity response characteristic of the transducer are discussed. A data gathering system based on AduC812 MCU is developed with the designed current transducer for resistance spot welding, by which the voltage and current signals are acquired in resistance spot welding test for mild steel board. The preliminary analysis shows that the voltage and current signal waveform, dynamic resistance, and input power of the welded joint correlate closely with the morphology of melt nugget, and they can be utilized in on-line quality monitoring of resistance spot welding.