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J Weld Join > Volume 32(6); 2014 > Article
Journal of Welding and Joining 2014;32(6):606-610.
DOI: https://doi.org/10.5781/JWJ.2014.32.6.70    Published online December 31, 2014.
A Study on Correlationship between the Induced Plasma and Emission Signals for In-process Monitoring in Stainless Steel Welding of Fiber Laser (Ⅱ)
- Properties Changes of the Measured Signals in a Thick Plate Welding -
Chang-Je Lee*, Jong-Do Kim**
Correspondence:  Jong-Do Kim,
Email: jdkim@kmou.ac.kr
Abstract
On this study, we researched the in-process monitoring during fiber laser welding as well as on the first paper. On the previous/formal study, we analyzed the change of emission signal on thin plate welding. On this study, however, we analyzed RMS and FFT with emission signals in laser welding on lap joint and butt joint of 8mm-thick 316L stainless steel. As the result, the movement of specific frequency peak was observed according to welding speed changes. Furthermore, frequency peak as a result of FFT on the thick plate welding are much clearer than on the thin plate welding. Therefore, it is expected that the welding parameter changes can be predicted in case of applying FFT to in-process monitoring.
Key Words: Fiber laser, In-process monitoring, Plasma, Emission signal, Lap joint, Butt joint, STS 316L, RMS, FFT


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