Conventional methods used to inspect the molten pool surface induced by arc welding processes are based on post-welding evaluation using destructive or semi-destructive testing methods. Many attempts were performed to develop alternative and nondestructive tests. In this context, a polarimetric vision methodology is evaluated. The polarimetric parameters are measured from the thermal radiations emitted by the hot liquid metal at a wavelength within an arc plasma blind spectral window. The Stokes parameters and their segmentation within a Gaussian mixture model allow to discriminate artifacts at the surface of the liquid metal. After weld pool solidification, the use of scanning electron microscopy and energy dispersive spectroscopy allow to identify the artifacts, i.e., floating alumina particles.

中文翻译：

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焊接过程中获得的液态金属熔池表面质量评价的偏振成像方法

用于检查由弧焊工艺引起的熔池表面的常规方法是基于使用破坏性或半破坏性测试方法的焊后评估。进行了许多尝试以开发替代性和非破坏性测试。在这种情况下，评估了偏振视觉方法。偏振参数是根据热液态金属在电弧等离子体盲光谱窗口内的波长下发射的热辐射测量的。斯托克斯参数及其在高斯混合模型中的分割允许区分液态金属表面的伪影。熔池凝固后，使用扫描电子显微镜和能量色散光谱可以识别工件，即漂浮的氧化铝颗粒。