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精确控制激光束使其始终对准并跟踪焊缝是保证激光焊接质量的前提.针对大功率(激光功率10kW)光纤激光焊接304型不锈钢紧密对接焊缝(间隙为0—0.1mm),研究一种基于红外热像的焊缝跟踪偏差检测新方法.采用红外传感高速摄像机摄取焊接区域熔池红外动态热像,分析激光束对准和偏离焊缝中心时的熔池温度分布和红外辐射特性,以熔池匙孔形变参数和热堆积效应参数作为激光束与焊缝中心偏差检测特征值,通过图像识别技术研究和分析特征值与焊缝偏差之间的关系.激光焊接试验结果表明,熔池匙孔形变参数和热堆积效应参数与焊缝偏差之间存在密切的数学关联,能有效判断和检测激光束与焊缝之间的偏差.
Precise control of the laser beam to align and track the weld is the prerequisite to ensure the quality of the laser welding.For high-power (laser power 10kW) fiber laser welding of butt-welded stainless steel type 304 (gap 0-0.1mm) A New Method of Detecting Weld Tracking Deviation Based on Infrared Thermography The Infrared Sensing High Speed Camera takes in the infrared thermography of molten pool in welding area and analyzes the temperature distribution and infrared radiation characteristics of the molten pool when the laser beam is aligned and deviated from the weld center , The keyhole deformation parameters and heat accumulation effect parameters of weld pool were taken as the characteristic values of laser beam and weld center deviation detection, the relationship between eigenvalue and weld deviation was studied and analyzed by image recognition technology.The results of laser welding test showed that melt There is a close mathematical relationship between the keyhole deformation parameters and the heat accumulation effect parameters and the weld deviation, which can effectively determine and detect the deviation between the laser beam and the weld.