激光熔覆质量评估与过程监测控制研究现状

Research Status of Laser Cladding Quality Assessment and Process Monitoring Control

激光熔覆再制造技术在零件修复方面已被广泛应用几十年,该技术在应用时熔覆层易出现成形不均匀,存在气孔、裂纹等缺陷,熔覆层的质量会直接影响零件的修复效果。因此,有效控制熔覆层质量是该技术应用过程中的关键。分析了国内外现有的以熔覆层截面形貌、稀释率和热影响区宽度为评价指标的质量评估方法,介绍了以图像、温度等为监测信号的质量监测技术,综述了自适应控制系统,继而根据目前研究进展对熔覆层成形质量的提高提供依据。

Laser cladding remanufacturing technology has been widely used in parts repair for decades. When applied? the cladding layer is prone to uneven formation and produce defects such as pores and cracks. The quality of the cladding layer directly affects the repair effect of parts. Therefore, effective control of the quality of the cladding layer is the key to the application of this technology. The quality evaluation methods based on the cross-section morphology,dilution rate and heat-affected zone width of the cladding layer are analyzed. The quality monitoring technology based on image and temperature and so on as monitoring signals is introduced. The adaptive control systems is reviewed,and then the basis for the improvement of the forming quality of the cladding layer is provided based on the current research progress.