Contact-less temperature measurement and control with applications to laser cladding
Contact-less temperature measurement and control with applications to laser cladding
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DOI：
10.1007/s40194-015-0275-7
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发表时间：
2016-01-01
影响因子：
2.1
通讯作者：
Vollertsen, F.
中科院分区：
文献类型：
--
作者：
Koehler, H.;Thomy, C.;Vollertsen, F.
在材料加工中，零件的热输入是一个主要问题。为了减少热影响，可以评估温度以优化工艺，即低变形、低稀释或较小的热影响区。提出了一种结合比热法和二维分辨率测量的新型传感器，并与现有的激光加工温度传感器进行了比较。研究表明，激光熔覆具有与发射率无关、热辐射衰减与二维温度信息无关的优点。可以定量、高精度地获得零件表面的温度分布。这些信息被成功地应用于确定熔池直径、潜热，以及验证基于有限元的温度场模拟。
In material processing, heat input into parts is a major issue. To reduce heat impact, temperatures can be evaluated to optimize processes, i.e., for low distortion, low dilution, or small heat-affected zones. A new sensor, which combines ratio pyrometry with 2D-resolved measurement, is presented and compared to existing temperature sensors in the context of laser processing. The advantages of independence of emissivity and attenuation of the thermal radiation together with 2D temperature information are demonstrated on laser cladding. The temperature distribution at the parts' surfaces becomes available quantitatively and with high precision. This information was successfully applied to determine melt pool diameters, latent heat, as well as to validate FEM-based temperature field simulations.