• Title/Summary/Keyword: 파이버 레이저

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Study on Fiber Laser Welding Characteristics of Copper for Secondary Battery Material (이차전지 소재용 구리의 파이버 레이저 용접 특성에 관한 연구)

  • Park, Eun Kyeong;Lee, Ka Ram;Lee, Hyun Jung;Yoo, Young Tae
    • Laser Solutions
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    • v.17 no.3
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    • pp.1-9
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    • 2014
  • In this study, we analyzed fiber laser welding for the pure copper thin plates in a series of secondary lithium-ion batteries; and performed the experiment for the purpose of the preceding study to replace bolt joints method the with the laser welding method. We have changed the peak power of the laser from 5 to 6kW, the pulse duration by 4, 6, 8, and 10ms, the frequency by 10, 12, 16, and 25Hz, and the focal position by -3, 0, and +3. As a result, when the focal position is at +3, the peak power is 5kW, and the pulse duration and the Frequency are 4ms and 25Hz, respectively, we obtain 2.1 and 2.5 times better tensional strengths, respectively, than the highest values of tensional strengths obtained with the focal positions at 0 and -3.

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A Study on T-Joint Welding by High Power Fiber Laser of SAPH Steel Plate for Automobile (자동차용 강판 SAPH의 고출력 파이버 레이저에 의한 T형상 용접특성에 관한 연구)

  • Oh, Yong-Seok;Yoo, Young-Tae;Shin, Ho-Jun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.3
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    • pp.35-44
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    • 2009
  • The purpose of this paper is to describe experimental results about the T-joint welding of the high power continuous wave (CW) fiber laser for SAPH steel plate for seat frame of car. The seat rail is a part of seat frame of cars. The assembling method is mostly fix up using a bolt and nut. But this assembling method has many demerits in productivity such as increasing work process and material cost. This paper presents an experimental study about Laser T-Joint weldability of seat rail. Laser welding has many advantages in lightness and saving material costs of seat frame. The laser beam was moved along the work pieces by six axis robot with process optical fiber. The laser beam is focused with a welding head within incident angle $15{\sim}45^{\circ}$ for the purpose of the T-joint welding through two side full penetration. The range of the root gap size is less than ${\leq}0.4mm$. Optical microscopy SEM were performed to observe the micro structures and determine the structures of welded zone.

A Study on the Fiber Laser welding of Ultra-Low Carbon Interstitial Free Steel for Automotive (자동차용 무침입형 극저탄소강의 파이버 레이저 용접에 대한 연구)

  • Oh, Yong-Seok;Shin, Ho-Jun;Yang, Yun-Seok;Hwang, Chan-Youn;Yoo, Young-Tae
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.3
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    • pp.342-349
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    • 2011
  • The purpose of this paper is to describe experimental results about the butt welding and bead on plate welding of the high power Continuous Wave (CW) Fiber laser for Ultra-low carbon Interstitial Free(IF) steel plate for gear part of car. After being welded of the gear parts by the fiber laser and electron beam Microstructures of melting zone had been mixed acicular, granular bainitic, quasi-polygonal and widmanstatten ferrite because of a radical thermal diffusion after welding, difference of critical volume and grain size. As a result of experiment, when gear parts were welded by the fiber laser and electron beam, the fiber laser welding has been stable properties without internal defects more than the electron beam welding. Therefore it has the very advantages of welding high quality and productivity more than conventional melting method. The optimal welding processing parameters for gear parts were as follows : the laser power and welding speed were 3kWatt, 30mm/sec respectively. At this time heat input was $21.2{\times}10^3J/cm^2$.

A Study on the Surface Treatment of Dental Implant using a Fiber Laser (파이버 레이저를 이용한 치과용 임플란트 표면처리에 관한 연구)

  • Shin, Ho-Jun;Yang, Yun-Seok;Hwang, Chan-Youn;Yoo, Young-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.8
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    • pp.915-928
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    • 2011
  • Titanium for dental implant application has the superior properties of biocompatibility, specific strength, and corrosion resistance. However, it is extremely difficult to find a suitable surface treatment method for sufficient osseointegration with biological tissue/bone cell and implant surface. Surface treatment technology using laser has been researched as the way to increase surface area of implant. In this study, to develop the surface treatment process with improved adhesion between implant and bone cell at the same time for superior biocompatibility, pulsed laser beam was overlapped continuously for scribed surface morphology and determination of friction coefficient. As the results, surface area and friction coefficient was increased over 2 times by the comparison with sand blasting, which is used for the conventional method. In this time, the optimal condition for laser beam power and beam irradiation speed was 13 watt and 50 mm/sec, respectively.

A Effects of Magnetic Field For Fiber Laser Micro Welding Process Using Carbon Steel of SCP1-S (자기장 영향에 따른 냉연압연 강판의 파이버 레이저 마이크로 접합 공정)

  • Lee, C.K.;Lee, W.R.
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.3
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    • pp.433-438
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    • 2012
  • We have studied on welding dissimilar materials of Carbon steel SCP1-S by using laser beam. In this research we have performed some experiments to know the possibility of welding dissimilar materials using laser beam and magnetic fields by adjusting the power output of 35W laser. Other conditions of the experiments were as follows : the welding speed was varied in the range 10 m/min nitrogen gas was used as shield gas, the flow value of shield gas was ranged 10 L/min. In order to ascertain of the welded surface, we have done the tensile strength testing, the hardness testing and the microscope observation. As a result, we have found that tensile strength was the highest at the condition of the welding speed of 10mm/s, the flow value of 10 L/min, the gap of two materials 0, and the use of nitrogen gas. Above testings have also showed that the tensile strength was generally satisfactory since the penetration of welding was almost complete due to the thinness of the materials. In addition, the formation of the welded area was excellent when it had the highest tensile strength.

Weldability with Process Parameters During Fiber Laser Welding of a Titanium Plate (I) - Effect of Type and Flow Rate of Shielding Gases on Weldability - (티타늄 판재의 파이버 레이저 용접시 공정변수에 따른 용접특성 (I) - 실드가스 종류 및 유량에 따른 영향 -)

  • Kim, Jong Do;Kim, Ji Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.12
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    • pp.1047-1053
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    • 2016
  • In this study, welding of pure titanium was carried out by using a continuous wave fiber laser with a maximum output of 6.3 kW. Because brittle regions form easily in titanium as a result of oxidation or nitriding, the weld must be protected from the atmosphere by using an appropriate shielding gas. Experiments were performed by changing the type and the flow rate of shielding gases to obtain the optimal shielding condition, and the weldability was then evaluated. The degree of oxidation and nitriding was distinguished by observing the color of beads, and weld microstructure was observed by using an optical microscope and a scanning electron microscope. The mechanical properties of the weld were examined by measuring hardness. When the weld was oxidized or nitrified, the bead color was gray or yellow, and the oxygen or nitrogen content in the bead surface and overall weld tended to be high, as a result of which the hardness of the weld was thrice that of the base metal. A sound silvery white bead was obtained by using Ar as the shielding gas.

High speed precision welding using by single mode fiber laser (파이버 레이저에 의한 고속정밀 용접)

  • Park, Seo-Jeong;Lee, Mok-Yeong;Jang, Ung-Seong;Kim, Gi-Cheol;Cheon, Chang-Geun
    • Proceedings of the KWS Conference
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    • pp.94-96
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    • 2005
  • Welding process of ultra thin stainless steel foil was investigated using a single mode Yb-fiber laser with a CW maximum output power 40W. In micro welding, critical power density for keyhole welding was 1 to 2 orders larger higher than in macro-welding due to larger thermal conduction, extremely high speed welding becomes possible.

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High speed key-hole welding by fiber laser (파이버 레이저에 의한 고속 키 홀 용접)

  • Park Seo-Jeong;Jang Ung-Seong;Cheon Chang-Geun;Ju Seong-Min
    • Proceedings of the KWS Conference
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    • pp.195-197
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    • 2006
  • The present study examined the characteristics of high speed welding thin metal sheet using single mode fiber laser of averaged maximum output power 300 W. Due to the fiber laser that has a good quality of beam can make a very small focusing beam size, thin metal sheet welding and high speed key hole welding can be peformed by high power density.

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Comparison on Autogenous Weldability of Stainless Steel using High Energy Heat Source (고에너지 열원에 따른 스테인리스강의 제살용접특성 비교)

  • Kim, Jong-Do;Lee, Chang-Je;Song, Moo-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.8
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    • pp.1076-1082
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    • 2012
  • Today the welding for LNG carrier is known to be possible using arc and plasma arc welding process. But because of the lower energy density, arc welding is inevitable to multi-pass welding for thick plate and has a limit of welding speed compared to laser which is high energy density heat source. When thick plate is welded, weld defect by multi-pass welding and heat-affected zone by high heat-input were formed. Therefore one-pass welding by key-hole has been considered to work out the problems. It is possible for Laser, electron beam, plasma process to do key-hole welding. Nowadays, plasma process has been used for welding membrane of cargo tank for LNG carrier instead of arc process. Recently, many studies have examined to apply laser process to welding of membrane. In this paper, weldability, microstructure and mechanical properties of stainless steel for LNG carrier welded by fiber laser were compared to those by plasma. As a result, although the laser welding has several times faster speed, similar properties and smaller weld and heat affected zone were obtained. Consequently, this study proves the superiority of fiber laser welding for LNG carrier.