• Title/Summary/Keyword: TIG 용접

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Study on The Status of Welded Parts According to The Types of Shielding Gas in TIG Welding (TIG용접에서 실드가스 종류의 변화에 따른 용접부의 변화상태 고찰)

  • Kim, Jin-Su;Kim, Bub-Hun;Lee, Chil-Soon;Kim, Yohng-jo;Park, Yong-Hwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.38-43
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    • 2015
  • Tungsten inert gas (TIG) welding is commonly used in industries that require airtightness, watertightness, oiltightness, and precision. It is a non-consumable welding method that is commonly used for the welding of non-ferrous metals, but it can be used to weld most metals. The methods of TIG welding can be divided into three types. The first, manual welding is done directly on the metal by a welder with a torch. The second, semi-automatic welding, gets help from a material supplying machine, but it is conducted by a welder. Lastly, automated welding is conducted fully by a machine during its process and operation. Depending on the selection of electrode, the amount of heat that is applied to the base material and the electrode rod changes and makes the shape of welded parts different. A direct-current positive electrode was used for this study. Through the change of shielding gas type on a structural steel (SS-400) that is commonly used in industry, the composition and shape changes in welded parts were detected after welding. The heat-affected area, hardness value, and tensile strength were also identified through hardness testing and tensile testing. In this study, it was found that the higher hardness value of the heat-affected is, the weaker the tensile strength becomes.

Input Current Harmonic Reduction of Inverer TIG Welder (인버터 TIG용접기의 전원전류 고조파 저감)

  • 김준호
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.560-563
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    • 2000
  • In this paper we proposed AC/DC boost converter to improve input current harmonic reduction in TIG welder. The proposed harmonic reduction circuit with UC2854AN acting on constant switching frequency average current control has a three-loop control structure : the inner current loop the line voltage feed-forward loop and th outer voltage loop. Also we applied the constant current strategy on full bridge IGBT inverter to stabilized the output current using the analog PI controller. To demonstrate the practical significance of the proposed methods some simulation studies and experimental results are presented.

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원자로 RI 생산용 조사용기 제작 및 시험

  • 박울재;한현수;조운갑;홍순복;이철영
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05b
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    • pp.763-768
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    • 1998
  • 방사성동위원소 생산용 표적을 중성자 조사하기 위해 하나로의 제반 특성을 고려하여 조사용기를 개발하였다 IP(Isotope Production), HTS(Hydraulic Transfer System) 조사공별로 내.외부용기를 제작하였으며 재료는 검증된 Al-1050을 사용하였다. 내부용기는 냉간용접(Cold Welding) 하고, 외부용기는 TIG(Tungsten Inert Gas) 또는 전자빔으로 용접한 후 He을 충진하고 밀봉하였다. 조사용기의 건전성을 입증하기 위해 기포누설시험, 내압시험, 가열시험, 침투탐상시험, He 누설시험을 수행하였다. 기포누설시험 결과 내부용기는 90% 이상이 3x$10^{-6}$atm.cc/sec 이하의 누설율을 보였고, 내압시험 결과 파단압력은 28kg/$\textrm{cm}^2$ 정도였다. 외부용기는 TIG 용접시 70%, 전자빔 용접시 90% 이상이 누설율 1x$10^{-8}$atm.cc/sec 이하였다. 개발된 조사용기를 사용하여 하나로에서 200여회 방사성동위원소를 생산하였으나 중성자 조사중 누출을 포함한 기타의 문제가 발생하지 않았다. 조사용기 개발에서 확립된 밀봉시험, 내압시험 및 가열시험 방법은 기체표적이나 내압이 발생하는 표적용기의 개발 및 시험에 응용할 수 있다.

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A Study on control mode of hybrid multi-function welder (하이브리드 다기능 용접기 제어 모드에 관한 연구)

  • Kim, Jin-Seok;Choi, Jae-Ho;Jeong, Yang-Kwon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.8 no.3
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    • pp.439-445
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    • 2013
  • This study is on the system that can integrate generator and charger to use as a welder and generator for need. Specifically, it was hybrid generator consisted with select switch to use generator controller and multiple function welder, that function were auto-stopping generator when generator power finish to recharge in recharger battery and Co2 MMA TIG MIG MAG are devide depend on supplying gas. This control system of voltage, high-frequency, motor and gas valve was implemented in order to improve the performance and convenience of existing welders to choose only one or two at a time.

The Characteristics on Arc Pressure Distribution of TIG Welding with Shield Gas Mixing Ratio (TIG 용접에서의 실드 가스 혼합비에 따른 아크 압력분포 특성)

  • Oh Dong-Soo;Kim Yeong-Sik;Cho Sang-Myung
    • Journal of Welding and Joining
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    • v.23 no.1
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    • pp.41-47
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    • 2005
  • Arc pressure is one of important factors in understanding physical arc phenomena. Especially it affects on the penetration, size and shape of TIG welding. Some researches were reported on the effect of arc pressure in low and middle current region. But there are not any research in high current region. The purpose of this study is to investigate the arc pressure distribution with mixing ratio of shield gas such as Ar and He gases. A Cu block with water cooling was specifically designed and used as an anode electrode in order to measure the arc pressure in high current region. Then, the arc pressure distribution was measured with change in welding current and mixing ratio of shield gases. The arc force was obtained by numerically integrating the measured results. As the results, it was shown that the arc pressure was concentrated at the central part of the arc in middle and high current regions when a pure Ar gas was used. In case of Ar + He mixing gas, the arc pressure was much lower than that of pure Ar gas. In addition, it was widely distributed to radial direction.

T-joint Welding Characteristics of Multi-thin Plate Dissimilar Thickness of SS41 of Automobile Battery by using Nd:YAG Laser (Nd:YAG 레이저를 이용한 자동차 배터리용 SS41 다층박판 이종두께 T형상 용접 특성)

  • Yang, Yun-Seok;Hwang, Chan-Youn;Yoo, Young-Tea
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.10
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    • pp.1078-1088
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    • 2012
  • In this paper, we present research experimental results about the different thickness T-joint welding of the high power continuous wave(CW) Nd:YAG laser for the secondary battery of a vehicle. Although the conventional method used for the secondary battery is a argon TIG welding, we utilize a laser welding to improve Tungsten Inert Gas(TIG) welding's weakness. The laser, which has a couple of advantage such as aspect ratio, low Heat Affected Zone(HAZ), good welding quality and fast productivity utilized in this work is a CW Nd:YAG laser. In order to observe laser welding sections, we used a optical microscope. Through the analysis of the metallographic, hardness, aspect ratio, and heat input, we obtained the desired data in condition of 1800 W laser beam power and 1.8 m/min and 2.0 m/min laser beam travel speeds. In order to compare electric resistances of the argon TIG welding and laser welding, we made an actual battery and the electric resistance of the laser welding is reduced by 40~45% comparing with the argon TIG welding.