面向锅炉水冷壁管的冷金属过渡熔覆工艺路径优化研究
Optimization of CMT cladding process path for boiler water-cooled wall tubes
李宏猷 1成小乐 1邢宇 1刘福广 2常哲 2吴晓俊2
作者信息
- 1. 西安工程大学机电工程学院,陕西 西安 710600
- 2. 西安热工研究院有限公司,陕西 西安 710054
- 折叠
摘要
为对电厂锅炉受热面管进行有效的修复及防腐处理,保障设备的安全运行,针对水冷壁管采用了一种冷金属过渡(cold metal transfer,CMT)熔覆工艺.设计了 4种熔覆工艺路径,通过 ANSYS 数值模拟与搭建的 CMT 熔覆实验平台,验证了数值模拟数据的可靠性.根据仿真过程中拟定的工艺进行对比,结果表明:设计的 CMT 热源函数表征的温度场较传统电弧热源吻合度更高,且沿材料厚度方向的温度梯度变化规律与试样横截面实际形貌规律一致;在热输入相同的情况下,交叉熔覆路径平均温度均比顺序熔覆路径低 30℃,交叉熔覆路径给基体带来的热影响更小,比顺序熔覆路径后的应力低 22.0 MPa;交叉反向熔覆路径下的管道变形较顺序反向熔覆路径减小 0.18 mm;综合考虑残余应力和变形量的影响,得出交叉反向熔覆路径是CMT最佳的工艺路线.
Abstract
In order to provide effective repair and rust prevention treatment for hot surface pipe of utility boilers,and to ensure safe operation of the equipment,cold metal transfer(CMT)cladding process is adopted for water-cooled wall tubes.Four cladding process paths are designed,and the reliability of the numerical simulation data is verified through ANSYS numerical simulation and the CMT cladding experimental platform.Comparison based on the process developed in the simulation process shows that,design of the CMT heat source function has a higher degree of agreement in characterizing the temperature field than the conventional arc heat source.Along the material thickness direction,the change rule of the temperature gradient is consistent with the actual morphology of the specimen cross-section.In the case of the same heat input,the average temperature of the cross-melting path is 30℃lower than that of the sequential melting path,the thermal effect of the cross-melting path on the substrate is smaller,and the stress is 22.0 MPa lower.Pipe deformation reduces by 0.18 mm in the cross-over reverse welding path compared with that in the sequential reverse welding path.Comprehensively considering the effects of the residual stresses and the deformations,the cross-reversed melting path is the optimal process route for CMT.
关键词
冷金属过渡/路径优化/温度场/残余应力/数值模拟Key words
cold metal transfer/path optimization/temperature field/residual stress/numerical simulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据