微间隙焊缝磁光图像磁荷理论建模检测分析

Modeling and detecting analysis for microgap weld magnetical-optical image based on magnetic charge theory

对于激光焊接要求的微间隙焊缝(≤0.1 mm),可采用磁光传感器进行检测跟踪。利用磁荷理论建模,在外加直流磁场对焊件焊缝磁化的情况下,研究焊缝表面所产生漏磁场分布特征,并利用磁光传感器把焊缝近表面磁场分布特征转换为对应的磁光图像。通过对焊缝近表面磁场分布特征和其对应磁光图像焊缝过渡带特征进行了对比分析研究,确定焊件微间隙焊缝磁光图像焊缝过渡带中心,对应实际焊件焊缝中心。研究结果表明,该模型能有效地解释焊缝磁光图焊缝信息,为采用焊缝磁光图进行焊缝跟踪识别提供了合理的理论依据。

Magnetical-optical(MO)sensor could be used to detect and track microgap weld(≤0.1 mm)for laser welding.In the case of using a DC magnetic field to magnetize the weld of the weldment,the magnetic charge theory was used to set up leakage magnetic field distribution model for nearby microgap weld surface.And then,this magnetic field distribution feature was converted to microgap weld MO image by MO sensor.Through the comparative analysis and study of the magnetic field distribution characteristics near the surface of the weld and the corresponding characteristics of the transitional zone in the MO image of the weld,the transitional zone center of the weld in the MO image of the microgap weld was determined to correspond to the actual weld center.The research result showed that the model could effectively explain MO weld information,which provided a reasonable theoretical basis for weld tracking and identification by MO image of the weld.