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Optical monitoring of Nd:YAG laser cladding

机译：Nd：YAG激光熔覆的光学监控

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摘要

A bi-dimensional monochromatic (0.860 μm wavelength, 2.5 X 2.5 mm~2 vision zone, 1.7 ms acquisition time) and 1-spot multi-wavelength (12 wavelengths in the spectral range 1.0-1.573 μm, 800 μm vision zone, 50 μs acquisition time) pyrometers are applied for surface temperature monitoring in Nd:YAG laser cladding. The experiments are carried out for cladding of wear resistant coatings varying laser power and powder feeding rate. Two different cases are studied: (a) wide cladded bead with lateral powder injection; (b) narrow cladded bed with coaxial powder injection. Temperature evolution corresponding to pulsed-periodic laser mode as well as two-dimensional steady-state temperature distributions corresponding to the CW-mode are analysed. Multi-wavelengths pyrometer is applied to restore the true temperature that is useful to control melting/solidification and to avoid thermal decomposition when complex powder blends are used. The CCD camera based diagnostic tool is applied for on-line monitoring of particle-in-flight velocity and size distributions in coaxial powder injection.
机译：二维单色光（波长为0.860μm，视觉区域为2.5 X 2.5 mm〜2，采集时间为1.7 ms）和一点多波长（光谱范围为1.0-1.573μm的12个波长，视觉区域为800μm，50μs采集时间）高温计用于Nd：YAG激光熔覆中的表面温度监测。为改变激光功率和送粉速度对耐磨涂层进行了覆层实验。研究了两种不同的情况：（a）侧面注入粉末的宽覆珠； （b）同轴注射粉末的窄包层床。分析了与脉冲周期激光模式相对应的温度变化以及与CW模式相对应的二维稳态温度分布。当使用复杂的粉末混合物时，可使用多波长高温计恢复真实温度，该温度可用于控制熔融/凝固并避免热分解。基于CCD摄像机的诊断工具被用于在线监测同轴粉末注射中的飞行中粒子速度和尺寸分布。

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