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To minimize the weld defect in manufacturing of the welded tube by using CO₂ laser, the monitoring of the welding quality and the seam tracking along the butt-joint lengthwise to the tube axis are studied. The longitudinal butt-joint is shaped from 60㎏f/㎟ grade steel sheet by 2 roll bending method, and welded by the CO₂ laser welding system equipped with the seam tracker and plasma sensor. The laser welded tube has the thickness of 1.5㎜, diameter of 105.4 ㎜ and length of 2000㎜. The precise positioning of the laser beam on the butt-joint to be assembled is obtained within 200㎛ by the laser vision sensor. The artificial defects in the butt-joint are well observed by the signal of plasma intensity measured from the plasma sensor of UV wavelength range within 400㎚. The developed CO₂ laser tube welding system has the function of the precision seam tracking and the real-time monitoring of the welding quality. In conclusion, the laser welded tube can be used for manufacturing of automobile chassis and components after hydro-forming.

목차

1. Introduction
2. Experimental method and system
3. Experimental results and discussion
4. Conclusion
ACKNOWLEDGEMENT
REFERENCES

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UCI(KEPA) : I410-ECN-0101-2009-555-016777383