• 제목/요약/키워드: 이면 비드

검색결과 34건 처리시간 0.021초

GMA를 이용한 배관용접의 이면비드 형상예측에 관한 실험적 연구 (An Experimental study on Prediction of Back-bead Geometry in Pipeline Using the GMA Welding Process)

  • 김지선;김일수;나현호;이지혜
    • 한국생산제조학회지
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    • 제20권1호
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    • pp.74-80
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    • 2011

  • In this study, a variety of welding experiments were carried out to optimize root-pass welding process using GMA process. Based on the experimental results, optimal welding conditions were selected after analyzing correlation between welding parameters and back-bead geometry. Then, effectiveness of empirical models developed was compared and analyzed, and optimized empirical models were finally developed for predicting back-bead by analyzing the main effect of each factor which affects back-bead geometry and their influence on interaction. Also, functions proper for expressing the surface of back-bead were selected using diverse quadratic functions, and back-bead geometry was visualized using empirical models developed and quadratic functions.

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박판 GMA 용접에서 단락 주파수를 이용한 이면비드의 제어에 관한 연구 (A Study on the Back Bead control by Using Short Circuit Frequency in GMA Welding of Sheet Metal)

  • 안재현;김재웅
    • Journal of Welding and Joining
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    • 제13권4호
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    • pp.75-84
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    • 1995

  • In GMA welding of sheet metal, the short circuit metal transfer mdoe is preferred because of its low heat input and capability of bridging the root gap. The molten electrode is transferred to the workpiece during repectitive short circuit in the model. The waveform of welding current or voltage and the frequency of short circuiting are affected by a number of factors including: magnitude of welding current and voltage, root gap, electrode extension, power supply characteristics, and so on. In this study experimental models were proposed, which are able to determine the relationship between the root gap and short circuit frequency and the relationship between the root gap and appropriate welding speed that produces the good quality of back bead without burn through. Using the experimental models, the root gap can be obtained from measuring the short circuit frequency, and then the appropriate weldig speed to the root gap can be determined. Thus a back bead control system was constructed by controlling the welding speed for maintaining the quality of back bead. The developed system has shown the successful capability of back bead control.

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