• Title/Summary/Keyword: Welding line

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Behavior of Stress and Deformation Generated by Repair Welding under Loading (공용중 보수용접에 의한 용접부의 응력 및 변형의 거동 - 인장력 작용중 균열보수용접에 의해 생기는 응력 및 변형의 거동 -)

  • Chang, Kyong-Ho;Lee, Sang-Hyong;Jeon, Jun-Tai
    • Journal of Korean Society of Steel Construction
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    • v.12 no.3 s.46
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    • pp.269-279
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    • 2000
  • It is much expected that steel bridges, which have been damaged by increase of vehicle load and corrosion, need repair or strengthening. In this paper, the stress generated by repair welding under loading are analyzed by three dimensional elasto-plastic analyses. The longer and deeper repair weld line bocemes, the larger the magnitude of transient stress becomes. The magnitude of transient stress generated by repair welding under loading $({\sigma}_y/3,\;{\sigma}_a)$ is similar to summation of stresses generated by repair welding and loading. The longer repair weld line ratio(1/b) becomes, the larger the magnitude of transient stress generated by repair welding under loading bocomes. And, the longer repair weld line ratio(1/b) becomes, the larger the magnitude of in-plane displacement generated by repair welding under loading$({\sigma}_y/3,\;{\sigma}_a)$.

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(A Study on the Thermal Deformation of Circumferential Welding by Thermal Elasto-Plastic Analysis.) (열탄소성 해석에 의한 원주용접 열변형에 대한 연구)

  • 김용섭;정충훈;김백현
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.238-246
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    • 2001
  • Residual stresses and thermal deformation of a structure due to welding are very imfortant factors for a weld design. It has been carried therretical analysis to invesitigate influence of heat flux to residual stresses and thermal deformation producted by curcumferential welding. Temperature,stresses and deformationn are obtain as a function of circumferentisl drgree and distance from welding center line. These result can applicate to predict and remove the deformation or residual stresses built up by welding.

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Multi-sensor based expert system for arc welding (다중 센서 정보에 의한 아크 용접 전문가 시스템)

  • 전의식;오재웅
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.797-800
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    • 1992
  • Much experience and knowledge is needed in welding because there are many working parameters and quantitative description is difficult. Therefore, introduction of expert system based on such data base has been required. In this study, welding heat and shape of bead was controlled by fuzzy inference with the welding condition, position error and voltage and current error of robot. For this, torch trajectory of robot was generated by modeling the working data with CAD and then welding was carried out through down loading to robot. And working error was controlled by on-line communication.

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Estimation of $CO_2$ Laser Weld Bead by Using Multiple Regression (다중회귀분석을 이용한 $CO_2$레이저 용접 비드 예측)

  • 박현성;이세헌;엄기원
    • Journal of Welding and Joining
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    • v.17 no.3
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    • pp.26-35
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    • 1999
  • On the laser weld production line, a slight alteration of the welding condition changes the bead size and the strength of the weldment. The measurement system is produced by using three photo-diodes for detection of the plasma and spatter signal in $CO_2$ laser welding. The relationship between the sensor signals of plasma or spatter and the bead shape, and the mechanism of the plasma and spatter were analyzed for the bead size estimation. The penetration depth and the bead width were estimated using the multiple regression analysis.

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DISTRIBUTIONS OF RESIDUAL STRESSES IN DIFFUSION BONDING OF DISSIMILAR MATERIALS TIAL TO STEEL 40CR

  • Peng, He;Jicai, Feng;Yiyu, Qian;Jiecai, Han
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.785-790
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    • 2002
  • Distributions of residual stress in diffusion bonding of dissimilar materials intermetallics TiAl to steel 40Cr were simulated by FEM calculation. Results showed that destructive residual stresses presented in the minute area adjacent to bond-line of the base material with smaller coefficient of thermal expansion. Reducing bonding temperature and diminishing bonding time are in favor of the mollification of interface tresses.

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The Welding Process Control Using Neural Network Algorithm (Neural Network 알고리즘을 이용한 용접공정제어)

  • Cho Man Ho;Yang Sang Min
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.84-91
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    • 2004
  • A CCD camera with a laser stripe was applied to realize the automatic weld seam tracking in GMAW. It takes relatively long time to process image on-line control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter and arc tight. For this reason, it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The adaptive Hough transformation was used to extract laser stripes and to obtain specific weld points. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path and to obtain the information such as width and depth of weld line. In this study, a neural network based on the generalized delta rule algorithm was adapted for the process control of GMA, such as welding speed, arc voltage and wire feeding speed.

DEVELOPMENT OF LASER VISION SENSOR WITH MULTI-LINE

  • Kieun Sung;Sehun Rhee;Yun, Jae-Ok
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.324-329
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    • 2002
  • Generally, the laser vision sensor makes it possible design a highly reliable and precise range sensor at a low cost. When the laser vision sensor is applied to lap joint welding, however, there are many limitations. Therefore, a specially-designed hardware system has to be used. However, if the multi-lines are used instead of a single line, multi-range data can be generated from one image. Even under a set condition of 30fps, the generated 2D range data increases depending on the number of lines used. In this study, a laser vision sensor with a multi-line pattern is

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Vision Sensor System for Weld Seam Tracking of I-Butt Joint with Height Variation (높이 변화가 있는 막대기 용접선 추적용 시각센서)

  • Kim Moo-Yeon;Kim Jae-Woong
    • Journal of Welding and Joining
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    • v.22 no.6
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    • pp.43-49
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    • 2004
  • In this study, a visual sensor system which can detect I-butt weld joint with height variation and includes a seam tracking algorithm was investigated. Three-dimensional position of an object can be acquired by using the method of distance measurement, i.e., an optical trigonometry which results from the spatial relations between the camera, the object and the structured light by a visible laser. Effects of laser intensity and iris number for the image quality as well as object material were investigated for the optical system design. For the image processing, a region of interest is defined from the whole image and a line image of laser is drew by using the gray level difference in the image. From the drew laser line, the weld joint can be recognized in searching the biggest point position calculated from the central difference method. Through a series of welding experiments, a good tracking performance was confirmed under GMA welding.

Development of laser tailored blank weld quality monitoring system (레이저 테일러드 블랭크 용접 품질 모니터링 시스템 개발)

  • 박현성;이세헌
    • Laser Solutions
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    • v.3 no.2
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    • pp.53-61
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    • 2000
  • On the laser weld production line, a slight alteration of the welding condition produces many defects. The defects are monitored in real time, in order to prevent continuous occurrence of defects, reduce the loss of material, and guarantee good quality. The measurement system is produced by using three photo-diodes for detection of the plasma and spatter signal in CO$_2$ laser welding. For high speed CO$_2$ laser welding, laser tailored welded blanks for example, on-line weld quality monitoring system was developed by using fuzzy multi-feature pattern recognition. Weld qualities were classified optimal heat input, a little low heat input, low heat input, and focus misalignment, and final weld quality were classified good and bad.

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