Abstract
Illumination of a laser melt pool simultaneously with focused and diffused argon laser light is found to provide a greatly improved image of the molten surface. A related method of imaging Ronchi rulings on the weld area using coherent laser light provides a means of melt pool dimensional measurement and weld seam monitoring.Illumination of a laser melt pool simultaneously with focused and diffused argon laser light is found to provide a greatly improved image of the molten surface. A related method of imaging Ronchi rulings on the weld area using coherent laser light provides a means of melt pool dimensional measurement and weld seam monitoring.
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