CO2焊接超声传感焊缝自动跟踪技术

将非接触超声传感焊缝跟踪技术引入到气体保护焊中。因为保护气体不同 ,超声波信号的衰减也不同。通过试验对Ar、CO2 ,和Ar CO2 等气体对超声波信号的影响进行了研究。结果表明 ,Ar对超声波信号衰减的影响比较小 ,而CO2 对超声波信号衰减的影响比较大。不采取其它措施 ,超声波传感焊缝跟踪系统在CO2 焊接中不能正常工作。根据理论分析 ,指出在CO2 中超声波信号衰减的主要原因是“驰豫吸收”作用的影响。在CO2 超声传感焊缝跟踪中消除驰豫吸收作用的影响是非常困难的。因此 ,提出了一些物理隔离方法 ,其中之一是采用“套筒 轴流风机”的方法。它对于防止CO2气体进入超声波信号传输的空间是非常有效的。试验结果表明 ,非接触超声传感器可以应用于CO2 焊接的焊缝跟踪中 ,所研制的CO2 焊接超声传感焊缝跟踪系统能够满足实际焊接工程的需要

Development of Seam Tracking Technology with Ultrasonic Sensor in CO2 Welding

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,CO 2 and Ar CO 2,on the ultrasonic signal are studied.The results show that the signal attenuation is smaller in Ar and it is greater in CO 2.The seam tracking system with ultrasonic sensor can not work normally in CO 2 arc welding without adopting measures.Based on the theory analysis the main reason of ultrasonic signal attenuation in CO 2 is the relaxation absorption effect.It is difficult to eliminate the relaxation absorption effect in CO 2 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 CO 2 entering the space of the ultrasonic signal transmission.The results of experiments show that the non contact ultrasonic sensor can be applied in CO 2 arc welding seam tracking,and the CO 2 arc welding seam tracking system with ultrasonic sensor can satisfies the requirements in real welding engineering.