WCB止回阀挖补修复焊工艺的仿真与优化

WCB止回阀挖补修复焊工艺的仿真与优化 Simulation and optimization of repair welding process for WCB check valve 谭心玥 TAN Xinyue 1 first-author 孙炎 SUN Yan 1 罗曼乐兰 LUO Manlelan 1 黄安国 HUANG Anguo 1 corresp huang-anguo@hust.edu.cn 华中科技大学材料成形与模具技术国家重点实验室 华中科技大学材料成形与模具技术国家重点实验室 State Key Laboratory of Material Forming and Die Technology,Huazhong University of Science and Technology State Key Laboratory of Material Forming and Die Technology,Huazhong University of Science and Technology 核电设备用WCB旋启式止回阀服役过程中容易产生开裂、磨损等缺陷,严重影响设备安全运行。利用Fluent软件探明了旋启式止回阀在稳定工作过程中容易出现缺陷的位置并提取缺陷位置,采用Inte Weld软件进行了挖补修复焊的数值模拟。研究了不同焊接功率下焊缝区域的残余应力和应变的大小和分布情况。计算结果显示,止回阀底部位置最易出现破损。焊接功率越低,焊接残余应力越小。焊接顺序为两边到中间的残余应力大于从左到右。道间冷却时间延长,焊后残余应力减小。当焊接功率为2 400 W、每层的焊接顺序为从左到右、每道焊缝间的冷却时间为300 s时,WCB挖补修复焊的残余应力最小,为323 MPa。将每层焊接顺序调整为左到右、右到左交替进行,能改善其变形情况。 Swing check valve used in nuclear power equipment is prone to crack and wear during service,which seriously affects the safe operation of the equipment. In this paper, Fluent is used to find out the location where defects are likely to occur during the stable operation of swing check valve,and the defect location is extracted. The numerical simulation of digging repair welding process is carried out by Inte Weld. The value and distribution of residual stress and strain in the weld under different welding powers are studied.The calculation results show that the bottom of the check valve is most likely to be damaged. The welding residual stress reduces as the welding power decreases. The welding sequence is that the residual stress from both sides to the middle is greater than that from left to right. The residual stress reduces as the cooling time between passes increases. When the welding power is 2400 W,the welding sequence of each layer is from left to right,and the cooling time between each weld is 300 s,the value of the residual stress in WCB repair welding is the minimum,which is 323 MPa. The deformation can be improved when the welding sequence of each layer is adjusted to alternately from left to right and right to left. 挖补修复焊 焊接残余应力 数值模拟 止回阀 repair welding welding residual stress numerical simulation check valve TG44;TM623 国家重点研发计划项目（2017YFE0100100） 2022-03-08 3 51