• Title/Summary/Keyword: Distance between laser and arc

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The characteristics of bead welding on steel with process parameter during the laser-arc hybrid welding(I) - Effect of flow rate of shield gas and distance between laser and arc - (강의 레이저-아크 하이브리드 용접시 공정변수에 따른 비드용접특성 (I) - 보호가스 유량 및 레이저 아크간 거리의 영향 -)

  • Kim, Jong-Do;Myung, Gi-Hoon;Song, Moo-Keun;Oh, Jae-Hwan;Suh, Jeong
    • Journal of Welding and Joining
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    • v.33 no.2
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    • pp.85-90
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    • 2015
  • Recently many studies for improvement of productivity and automation of process are in progress, and among others, laser-arc hybrid welding that combined laser and arc has attracted much attention. Since parameters by interactions as well as the parameters of each heat source should be considered, There are a lot of hardship in actual application, even though many researches have been done so far. Therefore in this study, bead welding was done to examine the effects of the flow rate of shield gas and the distance between laser and arc during laser-arc hybrid welding. As for hybrid heat source, disk laser and MIG were used. As experiment result, sound bead and weld with no defect were formed when the flow rate of front and rear shield gas were respectively 20 l/min and 15 l/min, and deep penetration was done at DLA=3 mm.

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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Development of Laser-Rotating An Hybrid Welding Process (레이저-회전 아크 하이브리드 용접공정의 개발)

  • Kim, Cheol-Hee;Chae, Hyun-Byung;Lee, Chang-Woo;Kim, Jeong-Han;Rhee, Se-Hun
    • Journal of Welding and Joining
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    • v.24 no.1
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    • pp.88-92
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    • 2006
  • Laser-rotating arc hybrid welding was introduced by combining $CO_2$ laser and rotating gas metal arc welding. While the arc rotation enhances the weld pool motion, it reduces the undercut formation which is one of most critical weld defects in the conventional laser-arc hybrid welding. This research investigated the bead characteristics according to the welding parameters such as frequency of rotation, welding voltage, shielding gas composition and interspacing distance between laser and we. The welding parameters were selected to reduce spatter generation and ensure sound weld beads fur bead welding and butt welding with various joint gaps. Gap bridging ability was improved, such that the sound weld beads were achieved for butt joint with up to 2mm joint sap, with no adjustment of CTWD(Contact tip-to-workpiece distance) and electrode diameter.

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.

Arrayed-Arc Slit Design to Improve the focusing Effect of the focused Lamb Wave by Laser (레이저에 의한 집속형 램파의 집속도 향상을 위한 원호형 슬릿 설계)

  • Jhang, Kyung-Young;Kim, Hong-Joon;Sin, Min-Jea;Kim, Jae-Yeol
    • Journal of the Korean Society for Nondestructive Testing
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    • v.25 no.2
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    • pp.87-94
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    • 2005
  • In recent, Lamb wave has been actively studied for non-destructive testing of plate. Among those studios, laser generation method of focused Lamb wave is expected to have high spatial resolution with advantages of non-contact testing. In this method, the laser beam is illuminated on the surface of object by through an arrayed-arc slit, and then the energy of the generated Lamb wave is concentrated at a focus of arc. This focusing effect improves the spatial resolution, which is dependant on the geometries of arrayed-arc slit. In this paper, the relationships between the parameters of arc-shaped slit and the focusing ability of the generated Lamb wave was investigated by the simulation based parametric study The results show that to improve the focusing effect, radius of illuminated laser, angle of arc and number of arcs must be increased, which minimum radius of arc and distance between arcs(=wavelength) must be decreased. These results are expected to be used as a guide to design the proper shape of slit.

Improvement of Penetration Characteristics by Plasma Augmented Laser Welding of Small Diameter Stainless Steel Tubes (PALW을 이용한 소경 스테인리스강 튜브의 용입특성 개선)

  • Hwang Jae-Ryeon;Yoon Suk-Hwan;Na Suck-Joo
    • Journal of Welding and Joining
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    • v.22 no.6
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    • pp.30-35
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    • 2004
  • Laser welding is obviously an attractive method to join small, thin parts such as small stainless steel tubes, but it is very sensitive to the joint clearance and tolerance, and this makes laser welding difficult to obtain consistent welding qualities over time. Recently, Plasma Augmented Laser Welding(PALW) is being developed to solve these problems. In this study, plasma arc welding(PAW) was introduced to join conventional V-grooved butt joint of thin stainless steel strips using single laser heat source in manufacturing small stainless steel tubes. The effect of the welding speed enhancement is investigated by the experiments. Effects of welding directions, distance between the heat sources and intensity of arc heat source on the optimal welding speed was investigated. Through this research, it was confirmed that PALW process has higher welding speed and robustness than laser welding process.

Depth Measurement Method Robust against Scattering of Line Lasers (라인 레이저의 산란에 강인한 심도 측정 방법)

  • Ko, Kwangjin;Yeon, Sungho;Kim, Jaemin
    • Journal of Korea Multimedia Society
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    • v.21 no.2
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    • pp.181-187
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    • 2018
  • Line-laser beams are used for depth measurement of welding beads along the circumference of a pipe. For this, first we project a line-laser beam on an rotating pipe and take a sequence of images of the beam projected on the pipe using a CCD camera. Second, the projected line laser beam in each image is detected, converted into a thin curve. Finally measure the distance between the thinned curve and an imaginary line. When a line-laser beam is projected to a rough metal surface such as arc welding beads, the beam is severely scattered. This severe scattering makes the thinned curve perturbed. In this paper, we propose a thinning method robust against scattering of line lasers. First, we extract a projected line laser beam region using an adaptive threshold. Second, we model a thinned curve with a spline curve with control points. Next, we adjust the control points to fit the curve to the projected line-laser beam. Finally, we take a weighted mean of thin curves on a sequence of image frames. Experiments shows that the proposed thinning method results in a thinning curve, which is smooth and fit to the projected line-laser beam with small error.