摘要
针对海洋用CRA双金属复合管薄壁基管堆焊过程中出现显著的管端缩径,机械加工后管端尺寸超差这一问题,设计了工艺革新及改进方案。通过采用优化焊接工艺参数和调整管端机械加工工艺等措施,使得双金属复合管管端机械加工后的尺寸满足了设计要求,同时Fe的稀释率降低。堆焊后对堆焊层进行拉伸试验、冲击试验、硬度测试、金相组织观察以及晶间腐蚀试验,结果表明,堆焊层的力学性能良好,且具备较好的耐腐蚀性能。
Aiming at the problem that pipe ends reduction occurred in CRA bimetal lined pipe overlay welding process, which caused pipe end dimension out-of-tolerance after mechanic processing, it designed technical innovation and improvement approach. By optimizing welding parameters and adjusting the mechanic processing technology of pipe ends, it made the dimension of bimetal lined pipe ends after machining meet the design requirements, and the dilution rate of iron element content decrease. The tensile test, impact test, hardness test, microstructure observation and intergranular corrosion test to overlaying layer were conducted. The results indicated that the overlaying layer performance is good, and are with better corrosion resistance performance.
出处
《焊管》
2015年第3期43-47,51,共6页
Welded Pipe and Tube
关键词
焊管
双金属复合管
堆焊
管端缩径
稀释率
welded pipe
bimetal lined pipes
overlaying
pipe end reduction
dilution rate
