Automatic control of positioning along the joint during EBW in conditions of action of magnetic fields

[摘要] Positioning along the joint during the electron beam welding is a difficult scientific and technical problem to achieve the high quality of welds. The final solution of this problem is not found. This is caused by weak interference protection of sensors of the joint position directly in the welding process. Frequently during the electron beam welding magnetic fields deflect the electron beam from the optical axis of the electron beam gun. The collimated X-ray sensor is used to monitor the beam deflection caused by the action of magnetic fields. Signal of X-ray sensor is processed by the method of synchronous detection. Analysis of spectral characteristics of the X-ray sensor showed that the displacement of the joint from the optical axis of the gun affects on the output signal of sensor. The authors propose dual-circuit system for automatic positioning of the electron beam on the joint during the electron beam welding in conditions of action of magnetic interference. This system includes a contour of joint tracking and contour of compensation of magnetic fields. The proposed system is stable. Calculation of dynamic error of system showed that error of positioning does not exceed permissible deviation of the electron beam from the joint plane.

[发布机构] Siberian Federal University, Svobodniy Av., 79, Krasnoyarsk; 660041, Russia^1;Reshetnev Siberian State Aerospace University, Krasnoyarsky Rabochy Av., 31, Krasnoyarsk; 660037, Russia^2

[学科分类] 航空航天科学

[关键词] Beam deflection;Interference protections;Joint tracking;Magnetic interference;Output signal;Spectral characteristics;Synchronous detection;Welding process