TEMPERATURE MONITORING FOR LASER METAL DEPOSITION USING NEAR-INFRARED SPECTROSCOPY

Siti Qistina Arora Talib; Aneez Syuhada Mangsor; Abdul Rahman Johari; Muhammad Safwan Abd Aziz; Ganesan Krishnan

doi:10.11113/jurnalteknologi.v86.22113

Authors

Siti Qistina Arora Talib Laser Centre, Ibnu-Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
Aneez Syuhada Mangsor Laser Centre, Ibnu-Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
Abdul Rahman Johari Laser Centre, Ibnu-Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
Muhammad Safwan Abd Aziz Laser Centre, Ibnu-Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
Ganesan Krishnan Laser Centre, Ibnu-Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia

DOI:

https://doi.org/10.11113/jurnalteknologi.v86.22113

Keywords:

Laser Metal Deposition (LMD), temperature monitoring, thermal radiation, near-infrared (NIR) spectroscopy, Planck’s Law

Abstract

Temperature monitoring during laser metal deposition (LMD) aids process control to ensure high-quality production. However, the fluctuating emissivity of the melt pool limits the accuracy of the existing non-contact temperature measuring devices. Thus, this work explores a new temperature monitoring technique, where the thermal radiation emitted by the processing zone was collected with a near-infrared (NIR) spectrometer and fitted to Planck's law to determine the temperature. This work has established the optimised angle and distance of the fiber probe from the LMD processing area to maximise the spectral signal acquisition. The temperature determined from the technique was cross-validated with a thermocouple, resulted in a small deviation of 2.39%. The applicability of the spectroscopic method for continuous temperature monitoring of the LMD process has been demonstrated. The optimised placement for the fiber probe end was determined at the 45˚ angle relative to the surface of the substrate and positioned 5 cm away from the molten pool. The temperature during the LMD process decreased gradually then stabilised after approximately 17 mm track length, resembling those reports in prior studies. Our findings support the practicality of the proposed temperature monitoring approach in LMD.

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