• Title/Summary/Keyword: 비드 높이

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A Study on Metallurgical Properties and Fatigue Strength depending on Bead Height in SAW Butt Joints (SAW 맞대기 용접부의 야금학적 특성과 비드높이에 따른 피로강도 연구)

  • H.W. Lee;Y.T. Shin;J.U. Park;H.G. Suk
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.3
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    • pp.62-70
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    • 1998
  • This paper is a study on the fatigue Strength depending on bead height. According to the AWS CODE D1.1, reinforcement shall not exceed 1/8"(3.2mm) in height. Most of the bead heights exceed AWS rule in actual welding. So we estimated the fatigue Strength of the as-welded specimens and the removed bead specimens of which height is 3mm with SAW 2 pole process. As a result, this paper presents that fatigue Strength is not concerned with as welded condition and removed 3mm bead height, also fatigue Strength obtained as welled specimens are satisfied with those proposed by the UK DEN, DNV and AWS.

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Control of molten pool by physical force of bead former in TIG welding of overhead and inclined-up position (위보기 및 경사상진자세의 TIG용접에서 비드성형기의 물리적 힘에 의한 용융지 제어)

  • Ha, Jong-Moon;Ham, Hyo-Sik;Im, Sung-Bin;Seo, Ji-Suk;Cho, Sang-Myung
    • Proceedings of the KWS Conference
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    • 2009.11a
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    • pp.23-23
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    • 2009
  • 우수한 용접부 품질 때문에 TIG를 이용한 오비탈 용접은 파이프 용접에 널리 사용되고 있다. 하지만 루트갭이 없고 루트페이스가 큰 맞대기 오비탈 용접의 위보기 및 경사상진자세에서는 오목한 이면비드가 형성되기 쉽지만, 이러한 문제를 극복하기 위한 연구는 희박한 실정이다. 본 연구에서는 위보기 및 경사상진자세에서 볼록한 이면비드의 형성을 연구하기위해서 용융지의 제어 방법을 적극적으로 검토하였다. 4mm 두께의 SS400 시편을 위보기 및 경사상진자세에서 각각 Bead-on-plate 용접하고, 이 때 비드성형기의 사용에 따른 비드 형상 변화를 관찰하였다. 텅스텐 전극과 비드 성형기간의 거리(Tip To Former Distance, 이하 TTFD)를 4.5mm에서 7.5mm로 1mm단위로 변경시켜 실험하였으며, TTFD가 증가할수록 위보기 및 경사상진자세에서 이면비드 높이가 감소하였으며 표면비드의 처짐이 증가하였다.

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Optimization of Ultrasonic Soil Washing Processes Using Aluminum Foil Erosion Tests (알루미늄 호일 부식 실험을 이용한 초음파 토양 세척 공정 개발의 기초 연구)

  • Kim, Seulgi;Son, Younggyu
    • Journal of Korean Society of Environmental Engineers
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    • v.37 no.2
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    • pp.92-98
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    • 2015
  • The physical effect induced by acoustic cavitation was investigated to accumulate basic data for the design of ultrasonic soil washing processes using aluminum foil erosion tests. A square aluminum foil was placed on the glass beads in the pyrex vessel submerged in the sonoreactor equipped with a 36 kHz ultrasound transducer module at the bottom. Cavitational erosion of foils was quantitatively analyzed for various glass bead diameter conditions (1, 2, and 4 mm), glass bead height conditions (5, 10, 15, and 20 mm), and water height conditions (5, 10, 15, and 20 mm). It was found that aluminum foil erosion significantly increased as the glass bead diameter increased and water height over the glass bead increased due to less attenuation of ultrasound and the optimization of sound field for cavitation. Moreover mechanical mixing was suggested to move constantly particles to the bottom area where the acoustic cavitation occurs most violently. It was because aluminium foil erosion by ultrasound transmitted through glass beads was relatively too weak.

Effect of Welding Parameters on Bead Shape, Microstructure and Hardness of Galvanized Steel Pipe Welds with GMAW (아연도금강관의 GMAW에서 용접변수가 비드형상과 미세조직과 경도에 미치는 영향)

  • Lim, Young-Min;Lee, Wan Kyu;Kim, Se-Cheol;Koh, Jin-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.2
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    • pp.535-541
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    • 2013
  • The present study was carried out to investigate the effects of welding parameters such as current, voltage and shielding gases on the bead shape, microstructures and hardness. It was confirmed that bead height was lowered and bead depth was increased with increasing voltages while height, depth and width of beads increased with welding currents. The hardness of weld metals with Ar+10% $O_2$ and Ar+20% $CO_2$ was low due to the formation of grain boundary and polygonal ferrites while that of weld metals with Ar+2% $O_2$ was high due to the presence of acicular, bainitic and sideplate ferrites.

Usage of Multiple Regression Analysis in Prediction System of Process Parameters for Arc Robot Welding (아크로봇 용접 공정변수 예측시스템에 다중회귀 분석법의 사용)

  • Lee, Jeong-Ick
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.4
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    • pp.871-877
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    • 2008
  • It is important to investigate the relationship between weld process parameters and weld bead geometry for adaptive arc robot welding. Howeve, it is difficult to predict an exact back-bead owing to gap in process of butt welding. In this paper, the quantitative prediction system to specify the relationship external weld conditions and weld bead geometry was developed to get suitable back-bead in butt welding which is widely applied on industrial field. Multiple regression analysis for the prediction of process parameters was used as the research method. And, the results of the prediction method were compared and analyzed.

Al-7020의 Pulse-GMA 용접에 관한 연구 1

  • 김재웅;허장욱;나석주;이용연
    • Journal of Welding and Joining
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    • v.6 no.2
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    • pp.47-55
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    • 1988
  • This paper reports on a study of the influence of welding variables on the weld shape of Al-7020 in pulse-GMA welding. Five variables, i.e., wire feed rate, peak pulse current, welding speed, welding votage, and pulse frequency were investigated for their effects on the weld shape. From the results of the 2$^{n-1}$ fractional factorial design, quantitative effects of each variable and the interaction of two variables were obtained, and consequently wire feed rate, welding voltage, and welding speed were determined as the main welding variables. Supplementary experiment was performed for ivestigating the detailed relationship between the main variables nd the seld shape. In this experiment, the penetation of the seldment increased when the wire feed rate was raised, nad the bead width increased when the welding voltage was raised or the welding speed was reduced.d.

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Welding Bead Detection Inspection Using the Brightness Value of Vertical and Horizontal Direction (수직 및 수평 방향의 밝깃값을 이용한 용접 비드 검출 검사)

  • Jae Eun Lee;Jong-Nam Kim
    • Journal of the Institute of Convergence Signal Processing
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    • v.23 no.4
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    • pp.241-248
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    • 2022
  • Shear Reinforcement of Dual Anchorage(SRD) is used to reinforce the safety of reinforced concrete structures at construction sites. Welding is used to make shear reinforcement, and welding plays an important role in determining productivity and competitiveness of products. Therefore, a weld bead detection inspection is required. In this paper, we suggest an algorithm for inspecting welding beads using image data of welding beads. First, the proposed algorithm calculates a brightness value in a vertical direction in an image, and then divides a welding bead in a vertical direction by finding a position corresponding to a 50% height point of the brightness value distribution in the image. The welding bead area is also divided in the same way for the horizontal direction, and then the segmentation image is analyzed if there is a welding bead. The proposed algorithm reduced the amount of computation by performing analysis after specifying the region of interest. In addition, accuracy could be improved by using all brightness values in the vertical and horizontal directions using the difference of brightness between the base metal and the welding bead region in the SRD image. The experiment compared the analysis results using five algorithms, such as K-mean and K-neighborhood, as a method to detect if there is a welding bead, and the experimental result proved that the proposed algorithm was the most accurate.