• Title/Summary/Keyword: 레이저 용접

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A study on manufacturing of laser welded tube from 60kgf/$mm^2$Grade Steel Sheet for one-body forming (60kgf/$mm^2$급 일체화 성형용 레이저 용접 튜브 제조에 관한 연구)

  • Seo, Jung;Lee, Je-Hoon;Kim, Jung-Oh;Kang, Hee-Sin;Lee, Mun-Yong;Jung, Byung-Hoon
    • Proceedings of the KWS Conference
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    • 2003.11a
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    • pp.18-20
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    • 2003
  • Optimal processing and system to produce the laser welded tube for one body formed bumper beam are studied. The calculated size of tube is a thickness of 1.4mm, diameter of 105.4mm and length of 2000mm. The tube is shaped from cool rolled high strength steel sheet(tensile strength: 60kgf/$\textrm{mm}^2$ grade). Two roll bending method is the optimal tube shaping process compared to UO-bending, bending on press brake, multi-step continuous roll forming and 3 roll bending methods. Weld quality monitoring and seam tracking along the butt-joint lengthwise to the tube axis are also studied. The longitudinal butt-joint is welded by the $CO_2$ laser welding system equipped with a seam tracker and plasma sensor. The constructed $CO_2$ laser tube welding system can be used for the precision seam tracking and the real-time monitoring of weld quality. Finally, the obtained laser welded tube can be used for one-body formed automobile bumper beam.

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Effect of B Contents on Hardness Characteristic of Disk Laser Beam Welded CP Steels (CP강의 디스크레이저 용접부의 경도특성에 미치는 B 함유량의 영향)

  • Park, Tae-Jun;Yu, Jung-Woo;Kang, Jun-Il;Han, Tae-Kyo;Chin, Kwang-Keun;Kang, Chung-Yun
    • Journal of Welding and Joining
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    • v.29 no.1
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    • pp.107-114
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    • 2011
  • CP steel was developed to reduce the weight and increase the strength of car body. When it was welded using state-of-the-art disk laser welding, the effected of boron on the microstructure and hardness were investigated. Welding power was fixed at 3.5kW and welding speeds were 4,8 and 12m/min. Full penetration occurred in welding speed of 12m/min and weld bead was almost unchanged with boron contents. But the welding speed increased, the upper and lower bead were narrowed. In a welding speed of more than 8m/min, underfill defects were formed on the bead bottom. The hardness of weld zone was somewhat fluctuation in fusion zone and HAZ showed the highest hardness values. The hardness of each region showed little change with the boron contents, and softening phenomenon occurred in the HAZ near the base metal regardless of the boron contents.

A study on ceramic and metal composite material joining for micro filter using thermal spray and laser welding (용사법과 레이저 용접을 이용한 복합소재 미세필터 연구)

  • Song, In-Gyu;Choi, Hae-Woon;Kim, Joo-Han;Yun, Bong-Han;Park, Jung-Eon
    • Proceedings of the KWS Conference
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    • 2010.05a
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    • pp.32-38
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    • 2010
  • Hybrid material(ceramic+metal) processes were developed for micro filter using ceramics coating at metal filter surface by thermal spray method, micro hole drilling at ceramic coated filter surface by femtosecond laser, and fiber laser direct welding of ceramic and metal (SUS304, SM45C) by capillary effect. Thermal spray process was used for ceramic powders and metal filters. The used ceramic powders were $Al_2O_3+40TiO_2$(Metco 131VF) powder of maximum particle size $5{\mu}m$ and ${Al_2O_3}99+$(Metco 54NS) power of maximum particle size 45m. Ceramic coated filters using thermal spray method had a great influence on powder material, particle size and coating thickness but had a fine performance as a micro filter. CW fiber laser was used to drill the top ceramic layer and melt the bottom metal layer for joining applications.

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A evaluation on laser lap welding characteristics of Al5J32 alloy for automotive application using Yb:YAG Laser welding (Yb:YAG 레이저를 이용한 자동차용 알루미늄 Al5J32 겹치기 용접부의 Spiking방지 및 용접성 평가)

  • Ahn, Do-Chang;Kim, Cheol-Hee;Kim, Jae-Do
    • Proceedings of the KWS Conference
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    • 2010.05a
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    • pp.93-93
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    • 2010
  • 환경 규제 및 배출가스 규제에 의하여 차량 경량화를 위해 점차적으로 Al합금의 차체 및 부품적용 비율이 점차 확대되고 있다. 이에 따라 알루미늄의 레이저 용접 시 출력, 초점거리, 용접 속도 등 공정 변수의 상관관계와 용접 결함 현상에 의한 관심이 집중된 연구가 많이 발표되었으며, 알루미늄 5000계열의 경우 박판 용접 시 기공, 균열 등 과 같은 결함 현상을 방지하기 위하여, Twin spot laser, Laser-TIG hybrid 등과 같은 공법 적용을 제안되었다. 본 연구에서는 Yb:YAG laser welding 시 Mg 함량이 높은 AA5J32을 소재를 이용하여 박판 겹치기 용접 시 Back side spiking 결함 방지를 위한 레이저 빔 출력 파형을 설계하여 실험을 수행하였다. 또한 파형의 특성에 따라 나타나는 겹치기 용접부의 기계적 특성과 기공에 대해 알아 보고자 하였다.

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Characteristics of Plasma Emission Signals in Fiber Laser Welding for API Steel (I) -Variation of Signals by Measuring Conditions- (API강재의 화이버레이저 용접시 유기하는 플라즈마의 방사특성 (I) -측정조건에 따른 광신호의 변화-)

  • Kim, Jong-Do;Lee, Chang-Je;Lee, Mok-Young
    • Proceedings of the KWS Conference
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    • 2010.05a
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    • pp.94-94
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    • 2010
  • Fiber laser is a heat source which is introduced recently, and so has a little researched data compare with conventional laser processing. Moreover basic data for welding monitoring are also insufficient. Therefore, in this study, the change of signal with measuring position and angle of plasma emission signals were analysed as a basic experiment for real time monitoring in fiber laser welding. As a result, the signals measured from the side, front and rear had the biggest intensity at $60^{\circ}$, and frequency peak to reflect the behavior of keyhole and swing of plasma by shield gas was detected at $45{\sim}60^{\circ}$. However, both intensity of signal and the result of FFT for monitoring were satisfied at the angle of $45^{\circ}$ from the side.

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The Comparison of Weldability in Hybrid & Laser Welded Ship Structure A-grade Steel (조선용 A-grade 강재에 대한 하이브리드 및 레이저 용접부의 용접성 비교)

  • Oh, Chong-In;Park, Ho-Kyung;Jeong, Eun-Young;Rajesh, S.R;Bang, Han-Sur
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2006.11a
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    • pp.193-196
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    • 2006
  • Recently many research are going on in the field of application of Laser and Laser-Arc hybrid welding for superstructures such as ship-structures, transport vehicles etc. Therefore in this study an optimized welding condition and numerical simulation for hybrid welding by using previous numerical analysis which is used to calculate the heat source for Laser and Laser-Arc hybrid welding has been analyzed. For this purpose, fundamental welding phenomena of hybrid process(Laser+MIG) are determined based on the experiments. In order to calculate temperature and residual stress distribution in Laser and Laser-Arc hybrid welds, finite element heat source model is developed on the basis of experiment results and characteristics of temperature and residual stress distribution in Laser and Laser-Arc hybrid welds are understood from the result of simulation and found comparable to the experimental values.

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Welding Characteristics on Heat input Changing of Laser Dissimilar Metals Welding (레이저 이종용접에서의 입열량 변화에 대한 용접특성)

  • Mo Yang-Woo;Shin Byung-Heon;Shin Ho-Jun;Yoo Young-Tae
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.2
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    • pp.51-58
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    • 2006
  • Laser welding of dissimilar metals has been widely used to improve a wear resistance and a corrosion resistance of the industrial parts. The objective of this research works is to investigate the influence of the process parameters, such as the welding for SM45C and STS304 with CW Nd:YAG lasers. The bead-on-plate welding tests are carried out for several combinations of the experimental conditions. In order to quantitatively examine the characteristics of the dissimilar welding, the welding quality of the cut section, stain-stress behavior and the hardness of the welded part are investigated. From the results of the investigation, it has been shown that the optimal welding condition without defects in the vicinity of the welded area and with a good welding qualify is 1600W of the laser power, 0.85m/min of welding speed and $4{\ell}/min$ of pressure for shielding gas.

NUMERICAL SIMULATION OF LASER WELD POOL GEOMETRY USING ENTHALPY METHOD (엔탈피 모델을 이용한 레이저 용융풀 형상에 대한 수치해석연구)

  • Lee, T.;Cheung, H.;Shin, S.
    • Journal of computational fluids engineering
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    • v.18 no.4
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    • pp.61-68
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    • 2013
  • Laser welding is widely used in the industry for the advantage of small heat affected zone and short weld process time. Conduction limit welding can be used to modify the surface characteristic and it is important to identify the heat affecting area correctly for the improvement of manufacturing accuracy. Since time and length scale associated with laser welding process are extremely small, numerical study can be a useful tool. In this study, two-dimensional axi-symmetric version of energy equation with enthalpy method has been used to analyze the effect of laser input conditions on final shape by the laser welding process. The proposed numerical procedure has been benchmarked with several experimental results and compared well. The modified Marangoni and Peclet number have been introduced using controllable input variables. Simple parametric researches have been performed for high Pr number material. The results show that higher Marangoni number increase fluid mixing, thus generating convex type weld pool. On the other hand, the width of the weld pool is proportional to Peclet number.

The Weldability of Laminated Stator Core for Motor by Pulsed Nd:YAG Laser [ I ] - The Effect of Processing Parameter on Weldability of Laser - (펄스 Nd:YAG 레이저를 이용한 모터용 스테이터 적층코어의 용접특성 [ I ] - 레이저 용접성에 미치는 가공변수의 영향 -)

  • Kim Jong-Do;Yoo Seung-Jo;Kim Jang-Soo
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.5
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    • pp.629-635
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    • 2006
  • Manufacture of motor by laser has been studying realization that was demands on market for lightening and miniaturization. Moreover. early in the 1980s. manufacture of parts for automobiles by laser welding was already successfully introduced. The purpose of this study was to develop production technology of the high quality laminated stator core for motor by pulsed Nd:YAG laser heat source. In the event of adjusting defocus and voltage to control humping in laser welding of the laminated core. sound bead could be obtained. but deep penetration was not. Therefore. explosive evaporating plasma was controlled by adjustment of peak power on pulse width. Particularly, because explosive evaporating plasma induced high peak power, made molten metal in keyhole scatter. a suitable adjustment of peak power was required to obtain sound bead. As a results of experiment. sound bead and deep penetration could be obtained.

Welding Characteristics of Cold Rolled Carbon Steel utilize CW Nd:YAG Laser (CW Nd:YAG 레이저를 이용한 냉연강판의 용접특성)

  • Shin B.H.;Yoo Y.T.;Shin H.J.;Ahn D.G.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.17-18
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    • 2006
  • Laser welding of metals has been widely used to improve a wear resistance and a corrosion resistance of the industrial parts. The objective of this research works is to investigate the influence of the process parameters, such as the welding for metals with CW Nd:YAG lasers. The bead-on-plate welding tests are carried out for several combinations of the experimental conditions. In order to quantitatively examine the characteristics of the butt welding, the welding quality of the cut section, stain-stress behavior and the hardness of the welded part are investigated. From the results of the investigation, it has been shown that the optimal welding condition without defects in the vicinity of the welded area and with a good welding quality is 1400W of the laser power, 0.8m/min, 0.9m/min of welding speed and $4{\ell}$ in of pressure for shielding gas.

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