Dual electromagnetic sensor is used for sensing the weld line. The sensor consists of excitation and two sensing coil wound over the ferro-magnetic core. By using the dual sensor, the effect of noise is minimized. It is based on the generation of eddy currents in the welding plate by passing current...
Dual electromagnetic sensor is used for sensing the weld line. The sensor consists of excitation and two sensing coil wound over the ferro-magnetic core. By using the dual sensor, the effect of noise is minimized. It is based on the generation of eddy currents in the welding plate by passing current through the excitation coil. The sensor can be used to track the butt joints having no gap between them, where a vision based sensor fails to track. Sensor sensitivity depends on the number of coil turns, frequency of excitation, distance of a sensor from the work piece, diameter of core, etc. The whole system consists of a sensor, a signal processing board, a motion controller and a personnel computer (PC). The raw sensor signal is processed using the signal processing board. It consists of amplification, rectification, filtering, averaging, offset adjustment, etc. Based on sensor data, the motion controller adjusts the position of a welding torch.
Dual electromagnetic sensor is used for sensing the weld line. The sensor consists of excitation and two sensing coil wound over the ferro-magnetic core. By using the dual sensor, the effect of noise is minimized. It is based on the generation of eddy currents in the welding plate by passing current through the excitation coil. The sensor can be used to track the butt joints having no gap between them, where a vision based sensor fails to track. Sensor sensitivity depends on the number of coil turns, frequency of excitation, distance of a sensor from the work piece, diameter of core, etc. The whole system consists of a sensor, a signal processing board, a motion controller and a personnel computer (PC). The raw sensor signal is processed using the signal processing board. It consists of amplification, rectification, filtering, averaging, offset adjustment, etc. Based on sensor data, the motion controller adjusts the position of a welding torch.
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제안 방법
이러한 이유로 값이 싸고 쉽게 제작할 수 있으며, 빛과는 상관이 없으며, sealing bead 그리고용락에 크게 구애받지 않는 전자기 센서를 이용한 용접선 추적 장치를 개발하게 되었다.
실험장치를 이용하여 전자기센서의 성능 및 제어시스템의 성능을 검증하였다.
실험결과로부터 얻은 제어시스템의 신뢰성을 바탕으로 실제 당사에 적용할 수 있는 제어시스템을 설계 및 제작하여 자동용접장치에 적용하였다.
성능/효과
Fig 4에서 보는 바와 같이 주행속도 lO/nzw/s로 deviation 10mm 판을 스캔하며 추적한 결과 평균적으로 1mm 이하의 seam 추적 에러를 나타냈으며, sealing bead가 시작되는 부분부터 끝나는 부분까지는 다른 곳보다 큰 에러를 가지는 것을 알 수 있다. 최대 1.
현장용 제어시스템은 실험용 장치의 제어시스템에서 검증된 내용을 바탕으로 구성되었다. 따라서 현장 적용 후 우수한 성능을 보였다.
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