对接接头
焊接
接头(建筑物)
磁场
Lift(数据挖掘)
激发
有限元法
职位(财务)
不对称
声学
磁光
材料科学
光学
工程类
结构工程
物理
计算机科学
机械工程
电气工程
数据挖掘
财务
经济
量子力学
作者
Xiangdong Gao,Guanxiong Huang,Deyong You,Chongzhou Lan,Nanfeng Zhang
标识
DOI:10.1016/j.jmsy.2016.11.005
摘要
Seam tracking is important for butt joint laser welding. A magneto-optical imaging approach is proposed to detect the micro-gap weld whose width is less than 0.2 mm. The symmetry of the magnetic field above the weld joint is an important precondition to ensure the detection accuracy of the magneto-optical imaging method. However, in actual complex industrial scene, it is difficult to guarantee complete symmetry of the magnetic field. This paper proposes an effective method for solving the problem of magneto-optical imaging deviation under an asymmetric magnetic field. Two possible factors causing the asymmetry of magnetic field above weld joint are firstly investigated using finite element analysis. By analyzing the characteristics of the magneto-optic medium used in the sensor and measuring the magnetic field distribution of weld joint at different lift-off height and different excitation voltage, the prediction model of deviation between the weld position detected by magneto-optical imaging and the actual weld position is built by back propagation (BP) neural network. The experimental result of weld seam tracking based on magneto-optical imaging shows that the change of the lift-off height will affect the detection accuracy of the weld position, and sufficient accuracy can be ensured after correcting the deviation according to the prediction model of magneto-optical imaging deviation.
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