Laboratory for Advanced System Engineering and Research

where innovative research creates new technology for the benefit of our future life

School of Mechanical and Automotive Engineering

Keimyung University, South Korea

레이저 가공 실험실 방문을 환영 합니다.

Welcome to Laser Material processing lab at Keimyung University. We hope you find valuable informaion for laser welding and micromaching.

레이저가공 실험실(Laboratory for Advanced System Engineering and Research)은 고밀도 에너지원인 레이저를 이용하여 레이저 미세 가공 및 레이저를 이용한 용접 등 관련 연구를 수행하고 있습니다.

Our lab is primarily focusing on laser material processing by using high energy density laser heat source. Femtosecond laser is an ultra short laser source for micro-/nano-scale material processing.

레이저 가공 실험실에서 수행하는 기초 연구는 레이저와 물질의 흡수 및 산란에 관련한 시뮬레이션 및 미세 가공 및 용접 시 발생하는 다양한 광학 특성 및 열 적 특성에 대한 기초 연구를 수행 하고 있습니다.

Fundamental research in the laser processing laboratory includes simulation of the absorption and scattering of lasers and materials, and we are conducting basic research on various optical and thermal properties that occur during micromachining and welding.

레이저 가공 실험실에서 수행하는 응용 연구는 크게 1) 극초단 레이저를 이용한 의료용 마이크로 스케일 가공 2) 대 출력 레이저를 이용한 차량용 부품 용접을 주로 수행하고 있습니다.

The applied research in the laser processing laboratory is mainly focused on 1) medical micro-scale processing using ultrashort lasers and 2) welding of automotive parts using large power lasers.

[Gallery of Iconic Research and Development Results]

Audio deep learning based tool wear evaluation, 2024 @Keimyung University

Audio deep learning process at CNC lathe, 2024 @Keimyung University

Hiearchy of multifunctional Deep learning process, 2024 @Keimyung University

Real time deep learning process for weld qualtiy monitoring

(2024 @ Keimyung Univ.)

Weld quality was monitored in real time by vision based (2024)

Power train laser welding

(2018 @ Keimyung University)

Turbine blades are automaticlly welded by laser. (patent, 2018)

Battery tab welding Jig

(2024 @ Keimyung Univ.)

Battery tab welding jig was designed and fabricated (2024)

Automatic tab welding jig

(2024 @ Keimyung Univ.)

Pneumatic powered and uniform force holding jig (2024)

EV battery cell fab. simulation

(2024 @ Keimyung University)

Duty cyle and beam combination can effectively predict weld quality (published in KSMPE, 2024)

Simulation for duty cylcle

(2023 @ Keimyung Univ.)

Computer simulation can predict the temperature distribution in laser welding and correlated to FLIR thermal camera for validation (published in KSMPE, 2024)

Multi spot laser welding simulation

(2023 @ Keimyung Univ.)

Computer simulation can predict the temperature distribution in multi spots laser welding (published in KSMPE, 2024)

EV battery cell fab.mping

(2023 @ Keimyung Unversity)

Copper and Aluminium electrode tabs are welded by high power laser (4kW) in various beam modulation (Thesis, J.Cha, 2022)

Laser beam modulation fo EV

(2023 @ Keimyung Univ.)

For the maximum quality, various laser modulations were used in laser welding (Theis, J. Cha, 2022)

Laser welding simulation

(2023 @ Keimyung Univ.)

Laser beam were taylored for the optimal beam modulation (COMSOL, 2023)

EV battery tab welding

(2023 @ Keimyung Unversity)

Copper and Aluminium electrode tabs are welded by high power laser (2023, research project)

In house metallography lab

(2023 @ Keimyung Univ.)

For the matallography analysis, stat of the art equipments are installed (2023, Lan)

Customized GUI for welding simulation

(2023 @ Keimyung Univ.)

COMSOL based laser welding simulation is customized(COMSOL, 2023)

Laser heating and cooling simulation(1)

(2023 @ Keimyung Univ.)

Dual laser beam heating and coolling for heat treatment, KSMPE best paper awarded, 2023

Laser heating and cooling simulation(2)

(2023 @ Keimyung Univ.)

Dual laser beam heating and coolling for heat treatment, KSMPE best paper awarded, 2023

Laser heating and cooling simulation(3)

(2023 @ Keimyung Univ.)

High cooling for heat treatment, presented in KSMPE conference, 2023

Laser heating and cooling simulation(4)

(2023 @ Keimyung Univ.)

High cooling for heat treatment, presented in KSMPE conference, 2023

Laser beam propagation

(100nm slit)

(2012 @ Keimyung Univ.)

Laser beam propagation

(200nm slit)

(2012 @ Keimyung Univ.)

Laser beam propagation

(300nm slit)

(2012 @ Keimyung Univ.)

Laser beam propagation

(400nm slit)

(2012 @ Keimyung Univ.)

Laser beam propagation

(Copper slit #1)

(2012 @ Keimyung Univ.)

Laser beam propagation

(Copper slit #2)

(2012 @ Keimyung Univ.)

Motor core welding

(2017 @ Keimyung Univ.)

Stacked motor cores were welded by fiber laser, propriety for consulting

Blaking die heat treatment by laser

(2022 @ Keimyung Univ.)

Heat treatment of die/mould for automotive parts, Ph.D. thesis by I. Jeon, 2023

Wobbling simulation(2)

(2022 @ Keimyung Univ.)

COMSOL FEM was used to understand wobbling effects and heat distribution of laser beam (published in various Journals to support experimental results)

Wobbling simulation(3)

(2022 @ Keimyung Univ.)

High speed wobbling effects for the laser welding (published in various Journals to support experimental results)

Dual heat & cool simulation

(2023 @ Keimyung Univ.)

Dual laser beam for heat treatment was demonstrated on FEM (published in KWJS and presented in many coference), Ph.D. thesis. ny I.H. Jeon

Heavy duty torque converter welding

(2015 @ Keimyung Univ.)

Power train parts were joined by high power DISC laser and the process speed was increased by 7 times max. The fatigue life was superior to other EB or Arc welding process.

Heavy duty laser welding

(2015 @ Keimyung Univ.)

Full penetration ensured longer fatigue life compared to EB or Arc welding process.

Deep learning process for welding quality monitoring

(2017 @ Keimyung Univ.)

Weld quality monitoring can be effectively performed by using Deep Learning Technology. About millions of image data were studied by DL and the system can classify pass/fail parts of welding. (published in Applied Science, 2022), patent pending, Master theis by T. Kim

Hybrid welding Humping

(2005 @ Ohio State University)

Laser can preheat the material right in front of arc welding process which can retard cooling of weld pool (published in Welding Journal, 2006, A.F. Davis Siver medal awarded)

ITO micro-machining

(2005 @ Ohio State University)

A specially selected wavelength of Femtosecond laser can effectively remove 100nm of ITO layer without damaging glass substrate (published in Applied Optics, 2007)

Micropatterning by FS laser

(2006 @ Ohio State University)

Femtosecond laser created matrix of micro holes (presented in ICALEO, 2006)

Micropatterning on PCL

(2013 @ Keimyung Univ.)

Micropatterns were created on subtle micro/nanofiber by ES PCL (published in J. Laser Apps., 2007)

Hybrid Welding

(2005 @ Ohio State University)

Laser can preheat the material on the edge of arc welding process which can smooth weld toes for the longer fatigue life (published in Science and Tech of Welding, 2007)

Glass cutting by FS laser

(2005 @ Ohio State University)

Fine glass cutting was performed by Femtosecond laser (published in Japanese Applied Physics, 2007)

Glass machining by FS laser

(2007 @ Ohio State University)

Femtosecond laser can create narrow micro channels on glass (published in Micromechanics and Micro engineering, 2007)

Laser beam split

(2003 @ Ohio State University)

The first challenge to split CO2 laser beam by using high reflective copper mirror with a deflecting device (Iconic achievement of Laser Lab)

Micro patterning on nanofibers

(2005 @ Ohio State University)

Femtosecond laser can precisely make patterns on subtle nanofibers without damaging PCL nanofibers (published in J. of Laser Applications, 2008)

Microjoining Modeling

(2011 @ Keimyung Univ.)

High precision laser welding system was used for micro joining of 200um thin diaphragms for commercial truck brake sensors (published in Korean Welding Journal, 2012)

Microjoining Experiments

(2011 @ Keimyung Univ.)

A custom made precision micro joining station (published in Korean Welding Journal, 2012)

Ceramic to Metal joining

(2012 @ Keimyung Univ.)

Iconic achievement of ceramic to metal joining. Pulsed fiber laser was used for the joining with a 'drill and weld' concept. (published J. of Mechanical and Science Technology, 2013)

Computer simulation for laser welding

(2020 @ Keimyung Univ.)

COMSOL FEM was used to predict heat distribution for the laser welding (published in various Journals to support experimental results)

Polymer joining quality monitoring by Deep learning

(2022 @ Keimyung Univ.)

Polymer weld quality monitoring was demonstrated by using Deep Learning Technology. (published in Applied Science, 2022), Master's thesis

Wobbling simulation(1)

(2022 @ Keimyung Univ.)

COMSOL FEM was used to understand wobbling effects of laser beam (published in various Journals to support experimental results)

0.2mm embossed Motor core stacking

(2022 @ Keimyung Univ.)

Iconic results of thin silicon steel core with embossed stacking

Deep learning process for weld quality monitoring

(2022 @ Keimyung Univ.)

Fully developed real time DL for weld quality monitoring, patent pending

Automatic spring assembly by magnetic seperator

(2020 @ Keimyung Univ.)

High speed spring loading system for the start motor with magneted seperator, patented

Blade welding optimization by laser welding

(2017 @ Keimyung Univ.)

FEM Simulation of torque converter blade stress analysis. Propriety consulting.

Blade laser welding process

(2017 @ Keimyung Univ.)

High speed laser welding for torque converter blade. Propriety consulting.

Automatic distance correction for laser welding (1)

(2017 @ Keimyung Univ.)

Automatic distance correction for laser welding in 5 axis machining center.

Automatic distance correction for laser welding (2)

(2017 @ Keimyung Univ.)

Automatic distance correction for laser welding in 5 axis machining center. presented in ICROM, 2018

Nanofiber fabrication (1)

(2015 @ Keimyung Univ.)

Nanofibers can be made from electrical potential between syringe needle and susbtrate. We demonstrated real time fiber size control by using HD camera and laser scattering.

Nanofiber fabrication (2)

(2015 @ Keimyung Univ.)

Full integration of nanofiber fabrication system for biomed applications.

Nanofiber fabrication (3)

(2015 @ Keimyung Univ.)

Nanofirbers were electro spun and stacked on the dielectric materail substrate

Nanofiber fabrication (4)

(2015 @ Keimyung Univ.)

3D printed PLA substrate is shown and PCL nanofibers were stacked on the top of PLA. NSF research fund awarded, 2015.

3D printed blood vessel connector

(2015 @ Keimyung Univ.)

Fabrication of blood vessel connector by 3D prinding (collaborative research with KMU medical center)

Laser head up display

(2010 @ Keimyung Univ.)

Laser beam was controlled by CAN data in an automobile and displayed on the transparent window. (industry research fund)

Power Train CVT welding

(2015 @ Keimyung Univ.)

High torque CV joint was welded replacing forging process, J. Jung's Master thesis.

Replica of human ear by 3D printing

(2015 @ Keimyung Univ.)

The first trial to replicate human organ by using 3D printing and nanofibers. One year was 3D scanned and mirrored in CAD. The replica of the ear was fabricated by 3D printing. (NSF research fund awarded)

Laser auto focusing control system

(2017 @ Keimyung Univ.)

Auto distance compensating laser beam system was demonstrated on the PKM 5 axis machining center. (KEIT funded research)

Arc welding monitoring

Arc welding was monitored by current waveform (2015, Keimyung University)

Weld quality monitoring

Welding spectrum was analyzed by current waveform(2015, Keimyung University)

Click here to download MATLAB code

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