摘要
为扩大等离子弧喷焊技术应用领域,提出分体等离子弧喷焊技术,对工件热量来源进行分析,在Q235钢表面依次制备WF372高铬铁基合金涂层,采用激光共聚焦显微镜、显微维氏硬度计分别对接头宏观形貌和典型接头硬度进行分析。结果表明,传统等离子弧喷焊接头的热影响区随着电流、送粉量的增加和预热温度的提升而扩大,而分体等离子弧喷焊接头的热影响区随着分离电子流的增加而缩小。分离电子流40 A时喷焊层的平均显微硬度为HV 711,而130 A电流全部流经母材时喷焊层的平均硬度为HV 548,热影响区的硬度高于母材硬度。
To expand the application of plasma transferred arc weld surfacing,the process of separated plasma transferred arc spray welding was proposed.The high chromium iron-base alloy powders(WF372) were deposited on the base metal of Q235 steel plates,and the bead cross-section and hardness of typical joints was analyzed by using confocal laser scanning microscope and micro-hardness tester.The results show that the heat affected zone(HAZ) of the joints by traditional plasma transferred arc spray welding is expanded with the increase of current,powder feeding rate and preheating temperature.However,the HAZ of the joints by separated plasma transferred arc spray welding is narrowed with the increase of separated current.The average micro-hardness of the spray welded layer is HV 711 when the separated current is 40 A,which is HV 548 with the total current 130 A flowing through the base metal.The micro-hardness of the HAZ is higher than that of base metal.
出处
《焊接》
北大核心
2016年第4期37-41,74-75,共5页
Welding & Joining
基金
国家自然科学基金项目(51375021)
北京市博士后工作经费项目(2015ZZ-15)
关键词
分体等离子弧喷焊
热输入
宏观形貌
硬度
separated plasma transferred arc spray welding
heat input
macroscopic
hardness
