电焊机2024，Vol.54Issue(4)：123-128,6.DOI:10.7512/j.issn.1001-2303.2024.04.18
Q690钢激光-MIG复合焊焊缝耐腐蚀性能研究
Research on Corrosion Resistance of Hybrid Laser-MIG Weld Metal of Q690 Steel
摘要
Abstract
The hybrid laser arc welding with high efficiency were conducted on Q690 medium thick plate.The microstruc-ture transformation and grain size change of the welded joint under different laser powers were analyzed.The open circuit potential,polarization curve,and EIS of the weld metal under different laser powers were tested,and the effect of laser power on the electrochemical corrosion behavior of the hybrid weld metal was obtained.The results showed that the micro-structure of the laser-MIG hybrid welding metal was composed of a large amount of acicular ferrite and a small amount of side plate ferrite and granular bainite.The amount of acicular ferrite and side plate ferrite in the arc zone was greater than those in the laser zone,and the grain size in the arc zone was slightly larger than that in the laser zone.The microstructure of the coarse grain heat affected zone was composed of lath martensite.With the increasing of laser power,the content of granu-lar bainite decreased,and the content of acicular ferrite and side plate ferrite increased in the weld metal.When the laser power increased from 1.5 kW to 2.5 kW,the open circuit potential of the weld metal,the diameters of capacitive loops in Ny-quist plot and the polarization resistance all increased,the polarization curve tended to shift right,the self-corrosion current density decreased,and the corrosion resistance improved.The weld metal under 2.5 kW laser power showed the best corro-sion resistance.关键词
Q690钢/激光电弧复合焊/耐腐蚀性能/显微组织/激光功率Key words
Q690 steel/laser arc hybrid welding/corrosion resistance/microstructure/laser power分类
矿业与冶金引用本文复制引用
周倩雯,严春妍,聂榕圻,陈锦伊,田展鹏,张可召..Q690钢激光-MIG复合焊焊缝耐腐蚀性能研究[J].电焊机,2024,54(4):123-128,6.基金项目
国家自然科学基金(51804097) （51804097）
国家级大学生创新创业训练计划(202210294017Z) （202210294017Z）
