• Title/Summary/Keyword: Laser-TIG hybrid welding

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A Study on $CO_2$ Laser-TIG Hybrid Welding of Zinc-Coated Steel Sheet Part 1: Analysis of Welding Phenomena (아연도금 강판의 $CO_2$ 레이저-TIG 하이브리드 용접에 관한 연구 Part 1 : 용접현상분석)

  • Kim, Cheol-Hee;Choi, Woong-Yong;Chae, Hyun-Byung;Kim, Jeong-Han;Rhee, Se-Hun
    • Journal of Welding and Joining
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    • v.24 no.4
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    • pp.22-26
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    • 2006
  • In lap welding of zinc-coated steel, porosity formation is one of most significant weld defects, which is caused by zinc vapor generated between the steel sheets. Various solutions have been proposed in the past years but development of more effective method is a worthwhile subject to be investigated. In this study, autogenous laser welding and laser-TIG hybrid welding was applied to the lap welding of zinc-coated steel without gap, and weld pool behaviors were observed by using high speed camera and the porosity generation mechanism was analyzed. The weld defects were successfully eliminated by laser-TIG hybrid welding. This is because the leading TIG arc partially melted the upper sheet and vaporized/oxidized the coated zinc on the lapped surfaces prior to the trailing laser illuminating the specimen.

A Study on $CO_2$ Laser-TIG Hybrid Welding of Zinc-Coated Steel Sheet Part 2 : Relationship between Welding Parameters and Weldability (아연도금 강판의 $CO_2$ 레이저-TIG 하이브리드 용접에 관한 연구 Part 2 : 공정변수와 용접성과의 관계)

  • Kim, Cheol-Hee;Choi, Woong-Yong;Chae, Hyun-Byung;Kim, Jeong-Han;Rhee, Se-Hun
    • Journal of Welding and Joining
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    • v.24 no.4
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    • pp.27-31
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    • 2006
  • Optimization of process parameters for laser-arc hybrid welding process is intrinsically sophisticated because the process has three kinds of parameters-arc, laser and hybrid welding parameters. In this paper, the relationship between weldability and several process parameters such as laser beam-arc distance, electrode height, welding current and welding speed, were investigated by the full factorial experimental design. Weld quality was evaluated by using weight of spatters which is related with the pore area. It was found that the weld quality was increased with the increases in laser beam-arc distance and welding current, and decreased with the increases in electrode height and welding speed.

Basic Welding Characteristics by Nd-YAG Laser Beam on AH32 (선급강재의 레이저 용접특성에 관한 기초실험 - HYBRID 용접시 LASER-ARC거리 변화에 따른 용융특성 변화에 관한 실험)

  • Bang, Ban-Sur;Joo, Sung-Min;Kim, Young-Pyo;Kim, Hyung;Katayama, Seiji
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2003.05a
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    • pp.279-283
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    • 2003
  • As the state of the art in recent years Laser-Arc Hybrid welding is tried actively because of its various economical and technical advantages. In this study, melting tendencies according to the variation of laser-arc distance are investigated in case of YAG laser-TIG Hybrid welding process of AH32 ship structural steel. Nd-YAG laser with a laser beam power of 3KW is used and varied laser-arc distance 0mm to 10mm with fixing the TIG current as l00A. There is certain distance between laser and TIG elecrode to improve welding heat input and also increase the penetration.

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LASER ARC HYBRID WELDING

  • Dilthey, Ulrich;Keller, Hanno
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.162-168
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    • 2002
  • Hybrid Welding means the coupling of the energy of two different energy sources in a common process zone. This paper describes prospects in laser-arc-hybrid-welding. Different kinds of lasers ($CO_2$ laser and Nd:YAG laser) and arc processes (TIG, Plasma and GMA) are considered.

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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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Recent Study of Technical Development for High Efficient Brazing (최신의 고능률 브레이징 기술개발 동향)

  • Yoo, Ho-Cheon
    • Journal of Welding and Joining
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    • v.34 no.2
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    • pp.36-45
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    • 2016
  • Recent developing tendency for technologies of high efficient brazing are studied by searching of NDSL, Science Direct, KIPRIS, PCT and so on. Active metal brazing, arc brazing, fluxless brazing, brazing with low melting point, reactive air brazing, laser brazing, laser droplet brazing are investigated. By optimal selecting of the above mentioned technologies, it needs to investigate an economical metallurgical design and the advanced brazing methods. To improve the embrittlement of intermetallic compound at brazing interface, it must be studied the inexpensive variant metals including nonmetals and the heat sources(MIG, TIG, Laser) by hybrid techniques.