A Study of a Dual-Electromagnetic Sensor for Automatic Weld Seam Tracking

용접선 자동추적을 위한 이중 전자기센서의 개발에 관한 연구

  • 신준호 (영남대학교 대학원 기계공학과) ;
  • 김재응 (영남대학교 기계공학부)
  • Published : 2000.08.01

Abstract

The weld seam tracking system for arc welding process uses various kinds of sensors such as arc sensor, vision sensor, laser displacement and so on. Among the variety of sensors available, electro-magnetic sensor is one of the most useful methods especially in sheet metal butt-joint arc welding, primarily because it is hardly affected by the intense arc light and fume generated during the welding process, and also by the surface condition of weldments. In this study, a dual-electromagnetic sensor, which utilizes the induced current variation in the sensing coil due to the eddy current variation of the metal near the sensor, was developed for arc welding of sheet metal butt-joints. The dual-electromagnetic sensor thus detects the offset displacement of weld line from the center of sensor head even though there's no clearance in the joint. A set of design variables of the sensor were determined for the maximum sensing capability through the repeated experiments. Seam tracking is performed by correcting the position of sensor to the amount of offset displacement every sampling period. From the experimental results, the developed sensor showed the excellent capability of weld seam detection when the sensor to workpiece distance is near less than 5 mm, and it was revealed that the system has excellent seam tracking ability for the butt-joint of sheet metal.

Keywords

References

  1. 대한용접학회 추계학술발표대회 아크용접용 비젼 시스템에서 화상처리에 관한 연구 정규철;김재웅
  2. Coaxial vision-based control of GMAW R.W. Richardson;C.C. Conrardy
  3. Proceeding of the 12th KACC Application of eddy current technique for the non-contact sensing of low concentration of electrolytic solution Ismail Abu Baker Md;katsunori Shida
  4. 한국정밀공학회지 v.15 no.3 자기변형재료를 이용한 절삭공구용 마이크로 포지셔너의 개발 박영우;원문철
  5. Proceeding of the 12th KACC 비접촉식 와전류형 제동장치의 최적 토오크 제어 이갑진;박기환;류제하
  6. Sensor Review v.4 Eddy current and ultrasonic sensors for robot arc welding M. P. Howarth;M. F. Guyote
  7. Mitsubishi Juko Giho Development of ultra heat-resistant electromagnetic sensing device and its application to welding apparatuses Wakamatsu
  8. Welding International Magnetic arc blow E. Hanova
  9. 대한용접학회지 v.15 no.1 박판 맞대기 용접에서 전자기식 센서를 이용한 용접선 자동 추적 시스템에 관한 연구 유병희;김재웅
  10. 한국정밀공학회 춘계학술대회논문집 전자기 센서를 이용한 용접선 위치결정 시스템 김영선;조형석
  11. Automation Technology of Arc Welding(JWS) Seam tracking and height control method of plasma gouging H. Fujiyama;H. Sonoda;T. Miyajima;H. Ichimura;K. Okuyama
  12. Sensor Magazine Designing and building an eddy current sensor Steven D. Roach
  13. 자동화를 위한 센서 김상진
  14. Operational amplifiers & linear integrated circuits Robert F. Coughlin;Frederik F. Driscoll