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초록· 키워드

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In the multi-pass welding of pressure vessels or ships. the mechanical touch sensor system is generally used together with a manipulator to measure the gap and depth of the narrow gap to perform seam tracking. Unfortunately, such mechanical toueh sensors may commit measuring errors caused by the deterioration of the measuring device.
An automation system of narrow gap multi-pass welding using a laser vision system which can track the seam line of narrow gap and which can control welding power has been developed. The joint profile of the narrow gap, with 250mm depth and 28mm width, can be captured by laser vision camera. The image is then processed for defining tracking positions of the torch during welding. Then, the real-time correction of lateral and vertical position of the torch can be done by the laser vision system. The adaptive control of welding conditions like welding currents and welding speeds. can also be performed by the laser vision system, which cannot be done by conventional mechanical touch systems. The developed automation system will be adopted to reduce the idle time of welders, which happens frequently in conventional long welding processes, and to improve the reliability of the weld quality as well.

목차

Abstract

1.Introduction

2.Automation of the narrow gap SAW

3.Multi-pass welding strategy

4.lamge processing of the narrow gap

5.Welding test

6.Conclusion

Acknowledgments

References

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UCI(KEPA) : I410-ECN-0101-2009-581-014252065