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차체부품 개발을 위한 원격 CO<sub>2</sub> 레이저 용접에 관한 연구
송문종,이규현,이문용,김석원,Song, Mun-Jong,Lee, Gyu-Hyun,Lee, Mun-Yong,Kim, Sok-Won 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5
The Remote welding system(RWS) using $CO_2$ laser equipment has focusable distance of laser beam longer than 800 mm from workpiece and can deflect the laser beam by the scanner mirrors very rapidly. In the case of normal welding system based on robot, there is a limit to move the shortest path in short time and this causes interference between robot and workpiece. On the other hand, RWS is the optimized equipment to get big merits with advanced sequence of welding and short cycle time. However, there is still a pending task such as the control of plasma in the welding process of thick sheets therefore, it requires high power laser beam because of the absence of assist gas equipment in itself. In this study, high-tensile steel plates were overlap welded with $CO_2$ RWS for the production of car body and the influence of penetration depth according to the existence of assist gas was analyzed. Excellent tensile strength with enough width of molten zone independent to penetration depth was observed under welding condition with 3.6 kW laser power and 2.8 m/min welding speed without assist gas. Finally, the proto-type automotive parts were produced by applying the deduced optimal welding condition.
서정,이문용,정병훈,송문종,강희신,김정오,Suh, Jeong,Lee, Mun-Yong,Jung, Beong-Hun,Song, Mun-Jong,Kang, Hie-Sin,Kim, Jeong-O 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.5
The laser welding of the car body and components has been spread in the automotive industry. The Nd:YAG laser welding system could be used in 3D welding with robot. However, this system cannot efficiently reduce the welding cycle time according to various welding sequences because the robot's moving time is same that of the resistant spot welding system. But the remote welding system with high power $CO_2$ laser and scanner makes it possible welding cycle time much faster than the robot laser welding system. In the $CO_2$ laser remote welding system, laser beam can be rapidly transferred to a workpiece by moving mirrors of scanner system. So, it makes reducing the cycle time of welding process and shaping various welding patterns easily. Therefore, in this paper, the characteristic of weld strength according to patterns of weld bead on $CO_2$ laser welding was investigated. Also, the relationship between shape of weld bead and value of tensile load was studied. Finally, the optimum remote welding condition for car bumper was investigated.
자동차용 980㎫급 고장력 강판의 Disk 레이저용접 특성
설현욱(Hyun-Uk Seol),송문종(Mun-Jong Song),이규현(Kyu-Hyun Lee),이문용(Mun-Yong Lee),김석원(Sok Won Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Application for laser welding have increased steadily in recent years due to its benefits such as high speed, high productivity and high density energy heat source. In this study the influence of welding parameters was investigated on penetration characteristics, mechanical properties including formability test in disk laser welded 980㎫ class steels. A shielding gas was used and bead-on-plate test was performed with various welding speeds. The main welding test was performed butt welding with various welding speeds at 2.5 ㎾ laser power.