• 제목/요약/키워드: Weld Image

검색결과 88건 처리시간 0.022초

화상처리에 의한 Gas Tungsten Arc 용접에서의 용융지폭제어에 관한 연구 (A Study of Weld Pool width Control in Gas Tungsten Arc Welding Using the Digital Image Processing)

  • 김동철;이세헌;엄기원
    • 대한기계학회논문집A
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    • 제20권9호
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    • pp.2760-2769
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    • 1996
  • The feedback control systems of welding process using visual information can improve weld qualities. However, it is very difficult to get the visual information of weld pool since the light intensity of welding arc is much stronger than that of the weld pool. To explore the possibility of extending the capability of automatic welding machines, a study of a closed loop controlled welding system consisted of a GTA welding machine, a vision system, a stepping motor system and a digital computer was undertaken. Particularly, in this system, a CCD camera with a long wavelength pass filter was used to get a better weld pool image. Subsequently, an image analysis technique has been developed to measure the weld pool width. Using this weld pool width measurement, a colsed loop control system adjusted welding speed to maintain a constant weld pool width.

GMA 용접로봇용 용접선 시각 추적 시스템에 관한 연구 (A Study on a Visual Sensor System for Weld Seam Tracking in Robotic GMA Welding)

  • 김동호;김재웅
    • Journal of Welding and Joining
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    • 제19권2호
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    • pp.208-214
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    • 2001
  • In this study, we constructed a visual sensor system for weld seam tracking in real time in GMA welding. A sensor part consists of a CCD camera, a band-pass filter, a diode laser system with a cylindrical lens, and a vision board for inter frame process. We used a commercialized robot system which includes a GMA welding machine. To extract the weld seam we used a inter frame process in vision board from that we could remove the noise due to the spatters and fume in the image. Since the image was very reasonable by using the inter frame p개cess, we could use the simplest way to extract the weld seam from the image, such as first differential and central difference method. Also we used a moving average method to the successive position data or weld seam for reducing the data fluctuation. In experiment the developed robot system with visual sensor could be able to track a most popular weld seam. such as a fillet-joint, a V-groove, and a lap-joint of which weld seam include planar and height directional variation.

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파이프의 가스메탈아크 용접에 있어 센서 시스템을 이용한 용융지 제어 및 용접선 추적에 관한 연구 (A Study on control of weld pool and torch position in GMA welding of steel pipe by using sensing systems)

  • 배강열;이지형;정수원
    • Journal of Welding and Joining
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    • 제16권5호
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    • pp.119-133
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    • 1998
  • To implement full automation in pipe welding, it si most important to develop special sensors and their related systems which act like human operator when detecting irregular groove conditions. In this study, an automatic pipe Gas Metal Arc Welding (GMAW) system was proposed to full control pipe welding procedure with intelligent sensor systems. A five-axes manipulator was proposed for welding torch to automatically access to exact welding position when pipe size and welding angle were given. Pool status and torch position were measured by using a weld-pool image monitoring and processing technique in root-pass welding for weld seam tracking and weld pool control. To overcome the intensive arc light, pool image was captured at the instance of short circuit of welding power loop. Captured image was processed to determine weld pool shape. For weld seam tracking, the relative distance of a torch position from the pool center was calculated in the extracted pool shape to move torch just onto the groove center. To control penetration of root pas, gap was calculated in the extracted pool image, and then weld conditions were controlled for obtaining appropriate penetration. welding speed was determined with a fuzzy logic, and welding current and voltage were determined from a data base to correspond to the gap. For automatic fill-pass welding, the function of human operator of real time weld seam control can be substituted by a sensor system. In this study, an arc sensor system was proposed based on a fuzzy control logic. Using the proposed automatic system, root-pass welding of pipe which had gap variation was assured to be appropriately controlled in welding conditions and in torch position by showing sound welding result and good seam tracking capability. Fill-pass welding by the proposed system also showed very successful result by tracking along the offset welding line without any control of human operator.

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Gas Tunsten Arc 용접에서 용융지폭의 퍼지 제어에 관한 연구 (A Study of Fuzzy Control of Weld Pool Width in Gas Tungsten Arc Welding)

  • 정현권;이세헌;엄기원
    • 한국정밀공학회지
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    • 제14권1호
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    • pp.150-157
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    • 1997
  • Uniform weld pool shape is important in determining the weld quality. And weld pool width is one of the most dominant factors of the seld pool shape. In order to control the weld pool width, the fuzzy logic controller, which is well adapted to the complicated nonlinear systems such as welding, was used in this study. The weld pool image was obtained through CCD camera, and the weld pool width was calculated by processing the image. Uaing the calculated width, welding speed, as a control input, was inferred by the fuzzy logic controller. An uniform weld pool width can be successfully obtained regardless of the disturbances in the system.

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산업용 CR 영상분석과 국부확률 선군집화에 의한 용접특징추출 (Feature Extraction of Welds from Industrial Computed Radiography Using Image Analysis and Local Statistic Line-Clustering)

  • 황중원;황재호
    • 대한전자공학회논문지SP
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    • 제45권5호
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    • pp.103-110
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    • 2008
  • 산업용 방사선영상으로부터 신뢰할만한 용접부위를 추출하는 것은 용접부의 결함을 검출하기 이전에 수행해야할 선행과제이다. 이 논문은 강판튜브 CR영상으로부터 용접특징 부위의 검출과 추출을 시도한다. 먼저 용접부위와 비용접부위로 구분된 샘플영상 160(개)를 통계 분석하여 두 부류 사이의 차이를 식별한다. 그 후 군집화 파라미터 결정을 위한 패턴분류 작업을 실시한다. 이 파라미터들은 간격, 함수부합정도 및 연속성이다. 관측된 용접영상을 선(線)별로 처리하되 각 선데이터군(群)에 가변 이동창을 적용하여 구역을 선점한다. 각 창을 구성하는 데이터의 직접 및 비용접부위 귀속여부는 국부확률선군집화 방식을 적용하여 분류한다. 순차적 과정을 거쳐 매 단계마다의 경계치 산출에 의해 두 영역 사이의 경계선을 추적하며 그 결과 용접 특징부위를 추출한다. 그리고 CR용접영상 실험을 통해 그 효과를 입증한다.

시각장치를 이용한 용융지의 계측과 제어 (Measurement and control of weld pool using vision system)

  • 박주용;황선효
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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    • pp.527-529
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    • 1986
  • Measurement and control system of weld pool is comprised of optical devices, image processor, personal computer and welding machine. Combinations of ND and Infrared filters were used to block the intense arc light and to get the clearer image of weld pool. Smoothing operation and conversion to binary data were performed to eliminate the noises and to decrease the processing time. A simple algorithm for feedback control was developed and weld pool size is controlled by welding current which is adjusted automatically with personal computer.

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GMA 용접로봇용 용접선 시각 추적 시스템에 관한 연구 (A Study on a Visual Sensor System for Weld Seam Tracking in Robotic GMA Welding)

  • 김재웅;김동호
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.643-646
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    • 2000
  • In this study, we constructed a preview-sensing visual sensor system for weld seam tracking in real time in GMA welding. A sensor part consists of a CCD camera, a band-pass filter, a diode laser system with a cylindrical lens, and a vision board for inter frame process. We used a commercialized robot system which includes a GMA welding machine. To extract the weld seam we used a inter frame process in vision board from that we could remove the noise due to the spatters and fume in the image. Since the image was very reasonable by using the inter frame process, we could use the simplest way to extract the weld seam from the image, such as first differential and central difference method. Also we used a moving average method to the successive position data of weld seam for reducing the data fluctuation. In experiment the developed robot system with visual sensor could be able to track a most popular weld seam, such as a fillet-joint, a V-groove, and a lap-joint of which weld seam include planar and height directional variation.

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

  • 김무연;김재웅
    • Journal of Welding and Joining
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    • 제22권6호
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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.

Study on Highly Accuracy Quality Evaluation of Spot Weld by use of Image Processing Technique

    • 한국생산제조학회지
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    • 제5권4호
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    • pp.38-46
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    • 1996
  • This paper discusses the feasibility of Ultrasonic Nondestructive Evaluation (UNDE) technique for sport weld quality. Ultrasonic c-scan image assisted by image processing technique was used for Nondestructive Evaluation(NDE) of spot weld quality. Ultrasonic testing results obtained were confirmed and compared by Optical Microscope and SAM(Scanning Acoustic Mircroscope) observation of the spot-weld cross section, The results show that the nugget dinameter can be successfully measured with the accuracy of 0.5mm. It was ascertained that ultrasonic c-scan technique is very effective method for the sake of the approach to the quantitative measurement of nugget diameter and the discrimination of the corona bond from nugget. Additional support for the above conclusions is provided by the results for galvanized steel. The ultrasonic results for galvanized welds generally correspond to the results for uncoated steel. Finally, it was found that the above-mentioned technique can be sufficiently applied to NDE method for securing the Quality Assurance(QA) of spot welded products in production line.

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겹치기이음에서 용접선 시각 추적 시스템에 관한 연구 (A study on vision seam tracking system at lap joints)

  • 신정식;김재웅;나석주;최칠룡
    • Journal of Welding and Joining
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    • 제9권2호
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    • pp.20-28
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    • 1991
  • The main subject of this study is the construction of an automatic welding system that has the capability to trace the weld seam in GMA welding of lap joints. The system was composed of a vision sensor, moving torch, and personal computer(IBM-PC). In the developed vision sensor, an image was captured by the frame grabber at the time of short circuit during welding. The threshold method was adopted for determining the structured light and the central difference method for detecting the weld joint. And the seam tracing of the torch was performed by using the data regeneration algorithm. In this system using the image at the time of short circuit, weld seam tracking was performed without any relations to arc light and spatters.

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