摘要
为解决传统油气管道缺陷修复耗时长、热输入过大、修复质量不易控制等问题,以X70管道为研究对象,采用冷金属过渡电弧增材制造工艺对缺陷管道进行修复。结果表明,单层单道试验后试件抗拉强度分别为596、581 MPa,高于母材最低抗拉强度570 MPa,焊缝与母材结合良好;搭接率为33%时,多道成形表面质量较高;层间抬升距离分别为2.41、2.04 mm时的多层成形质量较好;修复后试样未出现气孔、裂纹等缺陷;微观金相显示修复区主要由铁素体和少量贝氏体组成,保证了修复后的力学强度;拉伸试件断裂位置均位于母材,两方案试件的平均抗拉强度分别为629、621 MPa,修复后的性能符合标准要求,可对电弧增材修复油气管道缺陷提供一定参考。
To address the problems of traditional oil and gas pipeline defect repair technology,such as long processing time,excessive heat input,poor repair quality control and other issues,this paper takes X70 pipeline as the research object,using cold metal transfer wire arc additive manufacturing process to study the pipeline defect repair technology.The results show that the tensile strength of the specimens is 596 MPa and 581 MPa for single-layer and single-pass experiments,which is higher than the minimum tensile strength of the base material of 570 MPa,the weld seam and the base material combined well.When the overlap rate is 33%,the surface quality of multi-pass forming is higher.The multi-layer forming quality is better when the lift distance between layers is 2.41 mm and 2.04 mm respectively.No pores,cracks or other defects are observed in the repaired specimens.Microscopic metallography showed that the repair area was mainly composed of ferrite and a small amount of bainite,which ensures the mechanical strength after repaired.The fracture position of tensile specimens is located in the base material,the average tensile strength of the specimens in the two schemes is 629 MPa and 621 MPa respectively,and the repaired properties meet the standard requirements.This study provides a practical reference for wire arc additive manufacturing-based repair of oil and gas pipeline defects.
作者
张永弟
陈佳兴
戴璐钰
张利强
单根立
杨光
刘利剑
ZHANG Yongdi;CHEN Jiaxing;DAI Luyu;ZHANG Liqiang;SHAN Genli;YANG Guang;LIU Lijian(School of Mechanical Engineering,Hebei University of Science and Technology.Shijiazhuang 050091,China)
出处
《电加工与模具》
北大核心
2025年第4期57-64,共8页
Electromachining & Mould
基金
河北省重点研发计划项目(21311802D)
河北省科技重大专项(22281803Z)。
关键词
电弧增材制造
冷金属过渡
X70管线钢
缺陷修复
wire arc additive aanufacturing
cold cetal transfer
X70 pipeline steel
defect repair
