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同轴信息监测是一种直接对熔池和小孔进行监测的方法。本文介绍了激光深熔焊接过程中 ,同轴信号的采集原理和光路设计 ,利用同轴信息采集光路的激光焊接镜头采集了大功率Nd :YAG激光焊接过程中辐射的同轴光信号。对Q2 35钢激光深熔焊接过程中 ,从焊接熔池和等离子体中辐射的同轴光谱曲线是以连续谱为背景谱 ,当焊接参数的变化时 ,同轴辐射光的相对光强发生变化 ,而其与波长的对应关系没有变化。在激光深熔点焊过程中同时采集了同轴和水平辐射的光强信息 ,对比发现二者具有不同的峰值波长 ,并且在 5 5 0nm～ 5 80nm的波段内 ,二者的相对强度对比明显
Coaxial information monitoring is a direct method of monitoring pools and holes. In this paper, the principle and optical design of coaxial signal acquisition in laser deep penetration welding are introduced. The coaxial optical signal radiated by high power Nd: YAG laser welding is acquired by laser welding lens of coaxial information acquisition optical path. In the Q235 laser deep penetration welding process, the coaxial spectrum of radiation from the weld pool and the plasma is based on the continuum spectrum. When the welding parameters change, the relative intensity of the coaxial radiation changes , And its correspondence with the wavelength has not changed. In the process of laser deep-melting spot welding, the light intensity information of coaxial and horizontal radiation was collected at the same time, and the two had different peak wavelengths, and the relative intensities of the two in the band of 550 ~