Control of the melt pool size is necessary to achieve more homogenous material properties in wire arc additive manufacturing (WAAM). The melt pool size can be measured by camera imaging or temperature field measurement. The paper aims to investigate the feasibility of using a high dynamic range two-colored pyrometric camera (Pyrocam) for melt pool size measurement in a gas metal arc welding–based WAAM process. A set of band-pass filters is identified using spectroscopy analysis to reduce the optical arc emission while the melt pool remains visible. The fusion line is identified in temperature field images, the melt pool size is measured by an automated algorithm, and the results are compared with high-speed camera images. A possible correlation between melt pool size and the grain size is examined.

中文翻译：

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使用高动态范围双色高温测温仪在电弧增材制造过程中测量熔池尺寸

必须控制熔池大小，以在电弧增材制造（WAAM）中获得更均匀的材料性能。熔池的大小可以通过相机成像或温度场测量来测量。本文旨在研究在基于气体金属电弧焊的WAAM工艺中使用高动态范围双色高温照相机（Pyrocam）测量熔池尺寸的可行性。使用光谱分析确定一组带通滤光片，以减少熔池保持可见时的光弧发射。在温度场图像中识别熔合线，通过自动算法测量熔池大小，并将结果与​​高速相机图像进行比较。检查熔池尺寸和晶粒尺寸之间可能的相关性。