용접선 추적 비전장치를 이용한 원형-사각 파이프의 T형 조인트 레이저용접

• 영문명: T-joint Laser Welding of Circular and Square Pipes Using the Vision Tracking System
• 발행기관: 한국레이저가공학회
• 저자명: 손영일 박기영 이경돈
• 간행물 정보: 『한국레이저가공학회 학술대회 논문집』2008년도 추계학술발표대회 논문집, 164~169쪽, 전체 6쪽
• 주제분류: 공학 > 기계공학
• 파일형태: PDF
• 발행일자: 2008.11.30

영문 초록

Because of its fast and precise welding performance, laser welding is becoming a new excellent welding method. However, the precise focusing and robust seam tracking are required to apply laser welding to the practical fields. In order to laser welding of a type of T joint like a circular pipe on a square pipe, which could be met in the three dimensional structure such as an aluminum space frame, a visual sensor system was developed for automation of focusing and seam tracking. The developed sensor system consists of a digital CCD camera, a structured laser, and a vision processor. It is moved and positioned by a 2-axis motorized stage, which is attached to a 6 axis robot manipulator with a laser welding head. After stripe-type structured laser illuminates a target surface. images are captured through the digital CCD camera. From the image, seam error and defocusing error are calculated using image processing algorithms which includes efficient techniques handling continuously changed image patterns. These errors are corrected by the stage off-line during welding or teaching. Laser welding of a circular pipe on a square pipe was successful with the vision tracking system by reducing the path positioning and defocusing errors due to the robot teaching or a geometrical variation of specimens and jig holding.

키워드

Laser welding Square-circular pipes Vision Seam tracking Image processing