• Title/Summary/Keyword: TIG 용접

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Performance Improvement of TIG Welders Using Intelligent Control Algorithm (지능제어 알고리즘을 이용한 펄스 인버터 TIG 용접기의 성능 향상)

  • 김규식
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.556-559
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    • 2000
  • Pulse inverter-type TIG(Tungsten Inert Gas) arc welders are studied to investigate the dynamic performance of welding. Welding currents are controlled to be pulse waveforms resulting in stable are better welding performance. The hybrid-type controller is proposed to control the welding current. Todemonstrate the practical significance of our results we present some simulation results.

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Development of Automatic Voltage Control Equipment using LabVIEW Software (LabVIEW를 이용한 TIG 용접 자동 전압 제어 장치 개발)

  • Song, Sang-Eun;Jeong, Young Cheol;Cho, Young Tae;Jung, Yoon-Gyo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.1
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    • pp.112-117
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    • 2017
  • The arc, generated by Tungsten Inert Gas(TIG) welding, is stable and provides excellent quality of the weld. Since automation is difficult, a lot of work is performed by hand. In addition, to obtain the uniform weld quality is difficult when using a base metal having a nonuniform welding line, or when welding inside a pipe. Generally, TIG welding power has the characteristic of constant-current. The welding voltage is changed in proportion to the arc length. Hence, the automatic voltage control equipment should be applied at the TIG welding system. The automatic voltage control equipment has been designed using LabVIEW software. It consists of a manufactured voltage divider circuit, and jig for moving the torch. The voltage measurements and driving of the motor were performed through the algorithm implementation in LabVIEW. Welding was conducted while increasing the arc length. In this process, it was confirmed that the automatic voltage control equipment kept the arc length constant.

A Study on the Surface Harding of Aluminum Alloy - TIG Overlay Hardening of Al 5083- (알루미늄합금의 표면강화에 관한 연구 - Al 5083에 대한 TIG overlay 경화 -)

  • 이영호;강원석;이규천
    • Journal of Welding and Joining
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    • v.15 no.1
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    • pp.135-148
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    • 1997
  • It was attempted to improve wear resistance and durability under the load surface pressure that make a formation of the thick (mm-order) hard-surfacing layer for aluminum alloy of 5083. The thick hard layers were formed on the surface of 5083 by TIG overlay method. Al-(25.4, 33.6, 45.7 mass%) Cu filler metals which were newly developed were overlaid on two base metals forming the one bead, one layer and two layers. The investigation was made on the characteristics of hardening and wear resistance in relation to the microstructure of overlaid layers with selection of optimum overlaying condition.

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Weldability Increase of Aluminum by Variable Polarity Arc (가변 극성 아크의 알루미늄 용접성 향상에 관한 연구)

  • Cho, Jungho
    • Journal of Welding and Joining
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    • v.32 no.1
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    • pp.108-111
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    • 2014
  • Low arc weldability of aluminum alloy is enhanced by applying variable polarity TIG and the result is theoretically investigated to figure out the mechanism. Conventionally, it is well known fact that DCEP (reverse polarity) arc is effective on aluminum welding. The reason is due to oxide layer removal by plasma ion bombardment and therefore it is named as cleaning effect. Another fact of polarity characteristic is that DCEN shows higher heat input efficiency therefore conventional variable polarity arc used to apply DCEP portion as small as possible. However, higher DCEP portion shows bigger weldment in this research and it is explained by adopting a theory of arc concentration on oxide layer with tunneling effect which was not clearly mentioned before in several variable polarity TIG welding research. Disagreement between variable polarity TIG welding result and conventional arc polarity theory is rationally explained for the first time with help of electron emission theory.

A Study on the Analysis of the Thermal Stress and Residual Stress in Process of STS304 TIG Welding (STS304 TIG 용접시 발생하는 잔류응력과 열응력 해석에 관한 연구)

  • Ko, Jun-Bin;Park, Hee-Sang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.5
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    • pp.1-10
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    • 2008
  • Residual stress caused in the weldments with high restraint force are often during welding observed in the weldments of large size nozzles or radial tanks. The reason is that quantitative analysis about thermal stresses during welding is lack for this weldments. To verify Finite Elements Method(FEM) theory, the temperature was measured with thermocouple in a real time in this paper. Also analysis of the thermal stress for welding condition is performed by ABAQUS program package on various welding condition in 304 stainless steel butt welding.

Fatigue Characteristics of Non Load-Carrying Fillet Welded Joints according to Post-Processing in Weld Bead Toes (용접지단부의 후처리에 따른 하중비전달형 필렛용접부의 피로특성)

  • Hong, Sung Wook;Kyung, Kab Soo;Choi, Dong-Ho;Yong, Hwan Sun
    • Journal of Korean Society of Steel Construction
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    • v.12 no.6
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    • pp.701-713
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    • 2000
  • In this study, the 4-point bending test been performed in order to estimate effect of grinding on fatigue characteristics quantitatively for as-welded specimen, grinding specimen & TIG-dressing specimen for non load-carrying fillet welded joints subjected to pure bending. As a result of fatigue tests, fatigue strength at $2{\times}106$cycles of grinding specimen and TIG-dressing specimen has been increased compared with as-welded specimen and satisfied the grade of fatigue strength prescribed in specifications of domestics and AASHTO & JSSC. As a result of beachmark test, fatigue cracks on all specimens have occurred at several points where stress

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Electrochemical Evaluation of Corrosion Property of Welding Zone of 304 Stainless Steel (304 스테인리스강의 용접부위의 부식특성에 관한 전기화학적 평가)

  • Moon, Kyung-Man;Kim, Yun-Hae;Kim, Jong-Do;Lee, Myung-Hoon;Kim, Jin-Gyeong
    • Journal of Ocean Engineering and Technology
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    • v.23 no.4
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    • pp.58-63
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    • 2009
  • Two kinds of welding methods are used for austenitic 304 stainless steel: laser welding and TIG welding. The difference in the corrosion characteristics of the welded zone between these two welding methods was investigated using electrochemical methods, such as corrosion potential measurements, polarization curves, cyclic voltammograms, etc. The Vickers hardnesses of all the welded zones (WM: Weld Metal, HAZ: Heat Affected Zone, BM: Base Metal) showed relatively higher values in the case of laser welding than for TIG welding. Furthermore, the corrosion current densities of all the welding zones showed lower values compared to TIG welding. In particular, the corrosion current density of the HAZ with TIG welding had the highest value of all the welding zones, which suggests that chromium depletion due to the formation of chromium carbide appears in the HAZ, which is in the range of the sensitization temperature. Thus, it can easily be corroded with a more active anode. Consequently, we found that the corrosion resistance of all of the welding zones for austenitic 304 stainless steel could apparently be improved by using Laser welding.