Study on laser cladding multi-lapping technology of 27SiMn hydraulic support column

27SiMn液压支架立柱的激光熔覆多道搭接工艺研究 Study on laser cladding multi-lapping technology of 27SiMn hydraulic support column 曹青 CAO Qing 1 first-author 蔡志海 CAI Zhihai 1 杜学芸 DU Xueyun 2 尤家玉 YOU Jiayu 1 秦航 QIN Hang 1 陆军装甲兵学院机械产品再制造国家工程研究中心 陆军装甲兵学院机械产品再制造国家工程研究中心 Academy of Army Armored Forces,National Engineering Research Center for Remanufacturing Mechanical Products Academy of Army Armored Forces,National Engineering Research Center for Remanufacturing Mechanical Products 山东大学材料科学与工程学院 山东大学材料科学与工程学院 School of Materials Science & Engineering,Shandong University School of Materials Science & Engineering,Shandong University 大面积激光熔覆是经由多道搭接成形的,且矿用液压支架立柱的激光熔覆加工规模较大。但是,激光熔覆产生的气孔、夹渣、开裂已经成为凸显的行业基础共性问题,为控制不锈钢立柱的熔覆性能,减少气孔、夹渣、开裂等熔覆缺陷,以27SiMn材质的液压支架立柱为基体,开展大面积激光熔覆工艺多道搭接控制研究,深入探讨多道搭接熔覆的搭接区及其对耐腐蚀性能的影响,并通过调整熔覆步距进行多道搭接工艺试验,分析了熔覆平整度、稀释率对立柱成品的影响,以及熔覆层金相组织结构。结果表明:搭接区存在组织结构差异,容易存在气孔、砂眼等缺陷,立柱表面经机械加工后显露的搭接线周围是防腐蚀薄弱区,应该严格执行标准化工艺以保障该区域性能;熔覆平整度需要控制在0.03 mm以内;稀释率控制在10%以内的熔覆层组织结构平整均匀、与基体之间是冶金结合。 Large-area laser cladding is formed by multiple overlaps. At present,laser cladding is widely used in industrial production applications,and the laser cladding processing scale of hydraulic support columns for mining is the largest. However,pores,trachoma and cracking have become prominent common problems in the laser cladding industry. In order to control the cladding per formance of stainless steel columns and reduce defects,27SiMn hydraulic support column is used as the base to carry out multi-lapping laser cladding procedure experiment. The lap zone of multi-lapping cladding and its influence on corrosion resistance are discussed. The multi-lapping cladding procedure test is performed by adjusting the cladding steps,and the influence of cladding flatness and dilution rate on the finished column products is analyzed,and the metallographic microstructure of the cladding layer is also analyzed. The results show that there are differences in the microstructure of the lap zone,and it is easy to have defects such as pores and sand holes. Weak corrosion resistant area is around the exposed lap wire on the column surface after machining,so the standardized procedure should be strictly implemented to ensure the performance of this area;the cladding flatness needs to be controlled within 0.03 mm;the cladding layer whose dilution rate is controlled within 10% has flat surface and uniform microstructure,and is metallurgically bonded to the substrate. 液压支架立柱 激光熔覆 多道搭接熔覆 熔覆步距 hydraulic support column laser cladding multi-lapping cladding cladding step TD355.4;TG665 2022-03-08 7 50