Boone Nicholas, Davies Matthew, Willmott Jon Raffe, Marin-Reyes Hector, French Richard
Sensor Systems Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK.
Department of Physics and Astronomy, The University of Sheffield, Sheffield S10 2TN, UK.
Sensors (Basel). 2020 Dec 5;20(23):6952. doi: 10.3390/s20236952.
Tungsten inert gas (TIG) welding is a well-established joining process and offers the user flexibility to weld a large range of materials. Ultra-thin turbine tipping is an important application for TIG welding that is exceptionally challenging due to the wide range of variables needed to accurately control the process: slope times, arc control, travel speed, etc. We offer new insight into weld pool characteristics, utilizing both on- and off-line measurements of weld tracks. High-resolution thermal imaging yields spatially and temporally resolved weld pool phase transitions coupled with post-weld photographs, which gives a novel perspective into the thermal history of a weld. Our imaging system is filtered to measure a 10 nm window at 950 nm and comprises a commercial Sigma lens to produce a near-infrared (NIR) camera. The measured near-infrared radiance is calibrated for temperature over the range of from 800 to 1350 °C.
钨极惰性气体保护焊（TIG）是一种成熟的连接工艺，为用户提供了焊接多种材料的灵活性。超薄涡轮叶片尖端焊接是TIG焊接的一项重要应用，由于精确控制该工艺需要考虑众多变量，如斜率时间、电弧控制、行进速度等，因此极具挑战性。我们通过对焊缝轨迹进行在线和离线测量，为熔池特性提供了新的见解。高分辨率热成像技术能够实现对熔池相变在空间和时间上的解析，并结合焊接后的照片，为焊缝的热历史提供了全新的视角。我们的成像系统经过滤波处理，可在950纳米处测量10纳米的窗口，并配备了商用Sigma镜头，以生成近红外（NIR）相机。所测量的近红外辐射强度在800至1350°C的温度范围内进行了温度校准。
