为探讨石油钻杆损伤修复的新技术, 研发性能优异又价格低廉的耐磨修复材料, 采用Nd:YAG激光和氩弧填丝焊, 在钻杆基体表面进行了对比修复实验, 观察了微观组织, 测试了硬度和耐磨性能。结果表明, 激光修复区组织为细长板条马氏体、回火索氏体和残余奥氏体, 和氩弧填丝焊相比, 激光修复层晶粒明显细化。氩弧填丝焊硬度峰值(662.8 HV)在熔合线近基体区, 修复区硬度(平均415.1 HV)显著高于基体(230 HV左右), 从熔合线区向基体, 硬度整体呈连续降低趋势。激光修复区硬度均大于氩弧填丝焊, 从基体到修复层整体呈上升趋势, 且随Cr3C2含量增加, 硬度增大。激光修复层的耐磨性能较氩弧填丝焊得到明显的改善, 磨损失重量仅为氩弧填丝焊的50.6%～77.5%。

To develop new reparative technique of petroleum drill pipe damage, explore wear-resisting materials with high performance and low cost, check experiments on petroleum drill pipe substrate by pulsed Nd:YAG and wire feeding argon-arc welding had been carried out. The microstructure, hardness and wear resistance were investigated. It was found that microstructure of the laser repair zone is composed by slender lath martensite, tempered sorbite and residual austenite. And its grain was refined obviously than that of argon-arc welding. Micro-hardness values of argon-arc welding decreased from bonding zone to substrate zone, the maximum value (662.8 HV) happened in bonding zone close to the melting line, less than that of laser repair zone comparatively. Hardness of laser repair sample increased from substrate zone to laser repair zone, and enhanced gradually along with Cr3C2 content augmentation. Wear resistance was improved evidently than that of argon-arc welding. Wear extent was only 50.6%～77.5% of argon-arc welding.