采用500W激光器对回厂再制造的结晶器铜板进行激光清洗试验，去除表面氧化物。测试发现，材料基底光洁度3.2以上且锈蚀程度轻微的区域，清洗效果基本满足磁粉探伤要求；表面含有轻度油液的区域，清洗效果基本满足磁粉探伤要求；锈蚀严重的区域需要反复进行清洗。因此，500W激光器的清洗效率和清洗质量不高，特别是对于重油、重腐蚀等特殊工况的清洗不彻底，需要开发大功率激光清洗设备。

The 500W laser is used to conduct laser cleaning test on the continious casting mould copper plate remanufactured in the factory to remove the surface oxide. The test found that the cleaning effect basically meets the requirements of magnetic particle flaw detection in the area where the material substrate roughness is less than 3.2 and the corrosion degree is slight; For areas with light oil on the surface, the cleaning effect basically meets the requirements of magnetic particle inspection; Areas with serious corrosion need to be cleaned repeatedly. Therefore, the cleaning efficiency and quality of 500W laser is not high, especially for heavy oil, heavy corrosion and other special working conditions, so it is necessary to develop high-power laser cleaning equipment.