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HU Sheng-sun, TU Wan-hong, SUN Dong, SHAN Ping. Development of Seam Tracking Technology with Ultrasonic Sensor in CO2 Welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2002, (5): 19-22.
Citation: HU Sheng-sun, TU Wan-hong, SUN Dong, SHAN Ping. Development of Seam Tracking Technology with Ultrasonic Sensor in CO2 Welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2002, (5): 19-22.

Development of Seam Tracking Technology with Ultrasonic Sensor in CO2 Welding

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  • Received Date: March 18, 2002
  • In this paper,the seam tracking technology with non-contact ultrasonic sensor is introduced into gas shield arc welding.Because the protective atmospheres are different,the attenuation of the ultrasonic signal is different.Through experiments,the influences of the gases,such as Ar,CO2 and Ar+CO2,on the ultrasonic signal are studied.The results show that the signal attenuation is smaller in Ar and it is greater in CO2.The seam tracking system with ultrasonic sensor can not work normally in CO2 arc welding without adopting measures.Based on the theory analysis the main reason of ultrasonic signal attenuation in CO2 is the relaxation absorption effect.It is difficult to eliminate the relaxation absorption effect in CO2 arc welding seam tracking with ultrasonic sensor.Thus the physical isolation methods are advanced in this paper,and one of them is "a sleeve+a axial fan".It is useful for preventing CO2 entering the space of the ultrasonic signal transmission.The results of experiments show that the non-contact ultrasonic sensor can be applied in CO2 arc welding seam tracking,and the CO2 arc welding seam tracking system with ultrasonic sensor can satisfies the requirements in real welding engineering.
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