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김정오(Jeng-O Kim),이제훈(Jae-Hoon Lee),서정(Jeong Suh),이승우(Seung-Woo Lee) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.1
Pulse laser welding was performed on C22 metal bellows. The results can be summarized as follows: Laser welded metal bellows had less thermal distortion, narrow HAZ, high aspect ratio in comparison with other welding processes like TIG, Plasma welding. Laser welded bellows has higher tensile strengths than that C22 base metal. The value of hardness in laser weld metal was measured 100-120 Hv, it was decreased compared to the base metal. It is reasoned that due to the annealed by heat input during the laser welding.
김정오,이제훈,이승우,Kim, Jeng-O,Lee, Jae-Hoon,Lee, Seung-Woo 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.3
Fiber laser welding was performed on SUS Materials metal bellows. The results can be summarized as follows: When we tried to change welding focus location. we get the best welding line when focus location placed 0mm. In product welding, We could make a satisfactory product in constant area by applying optimized conditions and show a table that is able to help producer easily to apply it to manufacturing. In comparison with existing TIG and plasma welding, welded bellows by fiber laser has faster processing speed, smaller thermal effect, very narrow welding area and fine surface.
$CO_2$ 레이저를 이용한 용접튜브 제조공정에서의 용접선 추적 및 용접품질 모니터링
서정,이제훈,김정오,강희신,이문용,정병훈,Suh, Jeong,Lee, Jae-Hoon,Kim, Jeng-O,Kang, Hee-Shin,Lee, Moon-Yong,Jung, Byung-Hun 대한용접접합학회 2003 대한용접·접합학회지 Vol.21 No.7
Weld quality monitoring and seam tracking along the butt-joint lengthwise to the tube axis are studied. The material of tube is 60kg/$\textrm{mm}^2$ grade steel sheet, and the longitudinal butt-joint is shaped by 2 roll bending machine. The tube with a thickness of 1.5mm, diameter of 105.4mm and length of 2000mm is successfully obtained by the $CO_2$ laser welding system equipped with a seam tracker and plasma sensor. Experimental results show that the developed welding system can be used for the precision seam tracking and the real-time monitoring of weld quality, and the laser welded tube can be used for car body md component after tubular hydroforming.
서정,이제훈,김정오,정군석,정해용,Suh, Jeong,Lee, Jae-Hoon,Kim, Jeng-O,Chung, Koon-Seok,Jeong, Hae-Yong 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.3
Laser welding process for wing of a guided weapon is studied. Nd;YAG pulse laser beam is used to weld the skin(STS304, thickness: 1mm) to frame(AMS 5398) of wing. Optimal laser welding condition is obtained from the mechanical testing and observation of the welded joint.
강희신(Hee-Shin Kang),서정(Jeong Suh),김정오(Jeng-O Kim),조택동(Taik-Dong Cho) 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
Remote Laser welding technology for manufacturing automobile body is studied. Laser welding system and industrial robot are used for consisting the robot based laser welding system. The laser system is used 1.6kW Fiber laser(YLR-1600) of IPG. The robot system is used HX130-02 of Hyundai Heavy Industry(payload :130kg). The robot based laser welding system is equipped with laser scanner system for remote laser welding. The welding joints of steel plate and steel plate coated with zinc are butt and lap joint. The laser welding tests are performed through the observation the bead on plate and cross-section of welding part. During the past three years the laser system was used 4kW Nd:YAG laser(HL4006D) of Trumpf and the robot system was used IRB6400R of ABB(payload:120kg). The new laser source, robot and laser scanner system permit to increase the processing speed and to improve the process efficiency. This paper introduces the robot based remote laser welding system to permit to resolve the limited welding speed and accuracy of the conventional laser welding system.
강희신(Hee-Shin Kang),서정(Jeong Suh),김정오(Jeng-O Kim),조택동(Taik-Dong Cho) 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
Laser welding technology for manufacturing automobile body is studied. Laser welding system and robot are used for consisting the robot based laser welding system. The laser system is used 4kW Nd:YAG laser(HL4006D) of Trumpf and 1.6kW Fiber laser of IPG. The robot system is used IRB6400R of ABB(payload:120kg) and HX130-02 of Hyundai Heavy Industry(payload : 130kg). The welding joints of steel plate are butt and lap joint. The robot laser welding system is equipped with a seam tracker and plasma sensor. The monitoring method of welding quality and seam tracking technology along the butt-joint are studied. The seam tracking system is SMART-20LS and RAPAL of Servo-Robot and MVS-5 sensor of MVS. We investigate the parameters which have influence on the welding quality through the plasma intensity signals measuring method. The artificial defects (<⌀1mm) in joint are well observed by using the plasma intensity signals measured by the plasma sensor of UV and IR. The laser welding tests are performed after the observation the bead on plate and the welding process for non-linear tailored blank and front side member is studied. The new laser source and the new laser scanner system permit to increase the processing speed and to improve the process efficiency. The paper introduces the robot based remote laser welding system to permit to resolve the limited welding speed and accuracy of the conventional laser welding system.