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41. 发明授权

US06188041B1 Method and apparatus for real-time weld process monitoring in a pulsed laser welding 失效
标题翻译：脉冲激光焊接中实时焊接过程监控的方法和装置
公开(公告)号：US06188041B1
公开(公告)日：2001-02-13
申请号：US09190234
申请日：1998-11-13
申请人： Cheol-Jung Kim , Min-Suk Kim , Sung-Hoon Baik , Chin-Man Chung
发明人： Cheol-Jung Kim , Min-Suk Kim , Sung-Hoon Baik , Chin-Man Chung
IPC分类号： B23K2600
CPC分类号： B23K26/034 , B23K26/04 , B23K26/0643 , B23K26/0665
摘要： A method and apparatus for real-time weld process monitoring are provided for a pulsed laser welding. The thermal radiation from a weld pool is measured at several spectral bands through an aperture with single-element detectors after splitting the spectral bands with dichromatic mirrors and beam splitters. The distal end of an optical fiber for laser delivery can be used as an aperture and each spectral band signal is measured with a single-element detector. Due to the chromatic aberration of an imaging optics, the field of view from a single-element detector through the aperture is varied by the wavelength of spectral band. The weld pool size contributing to the spectral band signal varies by the wavelength of the spectral band. The transmittance profile of each spectral band also depends on the focus shift of imaging optics. By processing the measured spectral band signals, the size of a weld pool, the power variation on a workpiece and the focus shift of imaging optics can be monitored simultaneously. Furthermore, the weld pool sizes at predetermined positions in time are correlated to the weld depth and the weld defect such as a weld gap for weld quality assurance.
摘要翻译：为脉冲激光焊接提供了实时焊接过程监控的方法和装置。在使用双色镜和分束器分割光谱带之后，通过具有单元件检测器的孔径在几个光谱带处测量来自熔池的热辐射。用于激光输送的光纤的远端可以用作孔径，并且每个光谱带信号都用单元件检测器测量。由于成像光学元件的色差，来自单元件检测器通过孔径的视场由光谱带的波长变化。有助于光谱带信号的焊池尺寸随光谱带的波长而变化。每个光谱带的透射率分布也取决于成像光学元件的聚焦偏移。通过处理测量的光谱带信号，可以同时监测焊池的尺寸，工件上的功率变化和成像光学器件的聚焦偏移。此外，预定位置的焊池尺寸与焊接深度和焊接缺陷（例如用于焊接质量保证的焊接间隙）相关。

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