WE Colloquium: Hae Woon Choi, Real-time Arc Welding Monitoring by Current Profile Analysis for Torque Converters

Associate professor, Dept. of Mechanical and Automotive Engineering, Keimyung University, South Korea

Abstract

In this presentation, a non-destructive weld quality monitoring system will be introduced based on real-time signal measurement. The current waveform was analyzed to monitor the weld quality in real time process. The acquired current waveform was discretely analyzed for the top and bottom limits of peaks as well as the pulse frequency measurement. Fast Fourier Transform was implemented in the program to monitor the pulse frequency in real time. The developed algorithm or program was tested in the mass production for the validation purpose. The cross-section of weld profile was compared to the current waveform profile to correlate the monitored signal and the actual parts. Pulse frequency was also used as auxiliary tool for the quality monitoring. Based on the results, it was possible to evaluate the quality of welding by measuring the current waveform profiles and frequency measurements.

 

Bio

Prof. Hae Woon Choi is an associate professor at Keimyung University in South Korea and currently working as a visiting professor in Welding Engineering program at OSU. He received his Ph. D. degree from Welding Engineering in 2007 advised by Prof. Dave Farson at Ohio State University. His primary research areas are laser material processing and weld automation for welding engineering. He was a recipient of A.F. Davis silver medal by AWS and has been actively working as a member of welding and laser societies in Korea and America.