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International Journal of Automotive Technology > Volume 7(2); 2006 > Article
International Journal of Automotive Technology 2006;7(2): 209-216.
OPTIMAL PROCESSING AND SYSTEM MANUFACTURING OF A LASER WELDED TUBE FOR AN AUTOMOBILE BUMPER BEAM
J. SUH1, J.-H. LEE1, H.-S. KANG1, K.-T. PARK1, J.-S. KIM1, M.-Y. LEE2, B.-H. JUNG2
1Korea Institute of Machinery & Materials
2Sungwoo Hitech
ABSTRACT
A study has been conducted for an optimal processing and an apparatus for manufacturing a laser welded tube for one-body formed bumper beam. The tube dimensions used in calculation were the thickness of 1.4 mm, the diameter of 105.4 mm and the length of 2000 mm. The tube was formed of a cold rolled high strength steel plate (tensile strength of 600 MPa). The two-roll bending method was the optimal tube forming process in comparison with the UObending method, the bending method on the press brake, the multi-step continuous roll-forming method and the 3-roll bending method. Monitoring of the welding quality was conducted and the seam tracking along the butt-joint lengthwise to the tube axis was also examined. The longitudinal butt-joint was welded by using a CO2 laser welding machine equipped with a seam tracker and a plasma sensor. The CO2 laser tube welding machine could be used for precise seam tracking and real-time monitoring of the welding quality. As a result, the developed laser welded tube could be used for a one-body formed automobile bumper beam.
Key Words: Laser welded tube, Bumper beam, Seam tracking, Real-time quality monitoring
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