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采用光纤激光同轴保护焊接奥氏体不锈钢,利用激光焊接监测系统同步采集焊接过程中的光信号数据,并结合羽辉的形貌研究不同焊接条件对焊缝成形及光信号强度的影响规律。研究结果表明,光信号强度随着激光功率的增加逐渐增大。当离焦量从-6mm变化到6mm时,光信号强度先减小后增大。光信号变化可反映焊缝熔深的变化,可用于检测搭接间隙和焊缝位置变化引起的焊缝缺陷。通过P信号数据可判断焊接质量异常区的准确位置,焊接过程中光信号的强度同羽辉体积正相关。
The austenitic stainless steel was protected by fiber laser coaxial. The optical signal data of the welding process was collected synchronously by the laser welding monitoring system. The influence of different welding conditions on the formation of weld and the optical signal intensity was studied. The results show that the optical signal intensity increases with the increase of laser power. When the defocus amount changes from -6mm to 6mm, the optical signal intensity first decreases and then increases. Optical signal changes can reflect changes in weld penetration, can be used to detect lap gaps and weld seam changes caused by weld defects. Through the P signal data, the exact location of the abnormal area of welding quality can be judged. The intensity of optical signal during welding is positively correlated with the plume volume.