• 제목/요약/키워드: welding technology

검색결과 1,901건 처리시간 0.027초

작은 그루브 각을 가지는 맞대기 P-GMA 용접에서의 용접전류에 관한 연구 (A Study on the Welding Current in Butt Joint P-GMA Welding with Acute Groove Angles)

  • 김륜한;나석주;김철희
    • Journal of Welding and Joining
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    • 제28권4호
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    • pp.55-60
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    • 2010
  • The purpose of this paper is to propose a mathematical model of welding current for the P-GMAW by modifying the well known GMAW model. Welding power circuit is simply modeled as a RL electric circuit and solved as an ODE equation. The welding current depends on the joint shape, molten pool and welding parameters. To compare the molten pool effect to the welding current, CFD numerical simulation technique was adopted. Welding experiment is also conducted with the same welding parameters as used in numerical simulations to verify the proposed welding current model. The current model which is considered molten pool shape, is more fit to experiment result.

용접 비드 형상에 대한 용접공정 변수의 민감도 해석에 관한 연구 (A study on the sensitivity analysis of welding process parameters on weld bead geometry)

  • 이세환
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1998년도 춘계학술대회 논문집
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    • pp.274-280
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    • 1998
  • The welding technology and qualities are developed significantly, in recent years, in the use of automated processing technology and welding robot systems. But these automated welding technologies have many difficulties for finding the optimal welding parameter conditions. Because of the lack of mathematical model for determination of optimal welding process parameters. In this study, the sensitivity analysis of the empirical equations for finding weld bead width, height and penetration depth by using the published formulae. The selected major welding process parameters effected to weld bead geometries are the welding speed, current, voltage and weld wire diameter.

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자동차 이차전지 제조를 위한 알루미늄과 무산소동의 레이저 용접특성 (Laser Welding Characteristics of Aluminum and Copper Sheets for Lithium-ion Batteries)

  • 강민정;박태순;김철희;김정한
    • Journal of Welding and Joining
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    • 제31권6호
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    • pp.58-64
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    • 2013
  • Several joining methods involving resistance welding, laser welding, ultrasonic welding and mechanical joining are currently applied in manufacturing lithium-ion batteries. Cu and Al alloys are used for tab and bus bar materials, and laser welding characteristics for these alloys were investigated with similar and dissimilar material combinations in this study. The base materials used were Al 1050 and oxygen-free Cu 1020P alloys, and a disk laser was used with a continuous wave mode. In bead-on-plate welding of both alloys, the joint strength was higher than the strength of O tempered base material. In overlap welding, the effect of welding parameters on the tensile shear strength and bead shape was evaluated. Tensile shear strength of overlap welded joint was affected by interfacial bead width and weld defect formation. The tensile-shear specimen was fractured at the heat affected zone by selecting proper laser welding parameters.

DEVELOPMENT OF DIGITAL ASSEMBLY CELL FOR LASER WELDING OF SIDE PANELS

  • Park, H.S.;Lee, H.B.
    • International Journal of Automotive Technology
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    • 제7권6호
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    • pp.721-728
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    • 2006
  • This paper is concerned with development of digital assembly cell. Automotive industries, try to find out new welding technologies to replace the existing spot welding which is not appropriate anymore. Because of many advantages like good accessibility, welding quality and fast welding speed, laser welding seems the most appropriate solution for automobile manufactures. To apply this technology to welding of car body, experiments must be conducted according to material, geometry and layer in welding area. Based on the data of these experiments, the laser welding process and the quality of stitches are identified. And then, the comparison between the requirements of welding and the potential of equipments allows selecting the best equipments. By using the digital manufacturing, the configurations of laser welding cell are carried out. After all, the optimal laser welding cell is chosen by the evaluation of alternative cells with technical and organizational criteria.

Characteristics of Pulse MIG Arc Welding with a Wire Melting Rate Change by Current Polarity Effect

  • Kim, Tae-Jin;Lee, Jong-Pil;Min, Byung-Duk;Yoo, Dong-Wook;Kim, Cheul-U
    • Journal of Electrical Engineering and Technology
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    • 제2권3호
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    • pp.366-372
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    • 2007
  • Joining thin aluminum alloy is difficult using most welding techniques. Many of the problems are associated with bum-through by the high heat input. Common welding techniques are TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and PULSE-MIG welding. The method provides more control of the heat balance in the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities. In this paper, we proposed a new welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, and penetrations by this method are presented.

마찰교반점용접을 이용한 이종재료의 접합 (Friction spot joining of dissimilar materials)

  • 천창근;김특기;;김흥주;장웅성
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2007년 추계학술발표대회 개요집
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    • pp.155-157
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    • 2007
  • The Friction spot dissimilar welding of galvanized steel/Al6061-T6 was performed to investigate the mechanical characteristics of the joints. The presence of thin film of aluminum oxide on the surface and melting of zinc in the coating, made substandard joint characteristics for dissimilar Friction spot joining(FSJ) performed with out removing the coating. Where as, for dissimilar FSJ of galvanized steel/Al6061-T6 after removing the coating, superior agitation and welding quality has been obtained for a configuration of galvanized steel as the upper plate and Al6061-T6 as lower plate. The results from tensile tests and microscopic examination for various combinations of the welding parameters have been presented.

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플럭스 코어드 와이어에 따른 용접 중 콘택트 팁 내마모성 평가 (Wear Resistance Evaluation of Contact Tip according to Flux Cored Wire)

  • 김동윤;황인성;김동철;강문진
    • Journal of Welding and Joining
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    • 제31권4호
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    • pp.42-46
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    • 2013
  • The contact tip for flux cored arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. A damaged contact tip causes a productivity reduction and a welding quality problem. In this study, the welding experiments for the wear resistance of contact tip regarding flux cored wire types were performed. With two fold type and a seamless type flux cored wires, the wear rates of contact tips were compared. In addition, the wear rate was checked according to the contact tip position.