摘要
在焊管制造过程中需进行弯曲成型、焊接、水压、弯管、防腐等工艺过程,这些工艺过程造成的残余应力关系到焊管的服役寿命。介绍了焊管残余应力的研究方法、研究成果。指出,焊管的残余应力与其成型工艺关系重大,一般直缝焊管的残余应力水平低、分布均匀,螺旋焊管的残余应力水平高,且分布均匀性差。水压试验和扩径可以有效降低残余应力,但水压和扩径参数与残余应力的具体关系仍需要进行大量研究才能确定。最后指出,对切环法与磁测法的应用、螺旋焊管成型的精确模型、残余应力沿厚度方向的分布等问题仍需要进行深入研究。
During the manufacturing procedure, the pipe body was formed, welded, pressurized, bended and coated successively, and residual stress was induced into the pipe body which is closely related with the service life, and many researches are about it. In this paper the main residual stress studing methodes and main research results are reviewed. It has a very strong relationship between residual stess and forming process. The residual stress of general LSAW （ Longitudinal Submerged Arc Welded ） pipe is lower and more uniform than HSAW （ Helical Submerged Arc Welded） pipe. Hydrotest and expanding process can effectively reduce residual stress, but the relationship among hydrotest pressure, expanding parameter and residual stress need to be defined through a lot of research. Meanwhile the application of ring-slit method and magnetic method, the model of HSAW pipe forming, the distribution along thickness of residual stress need to be studied deeply.
出处
《焊管》
2009年第7期12-17,共6页
Welded Pipe and Tube
关键词
焊管
成型
焊接
残余应力
水压试验
扩径
切环法
welded pipe
forming
welding
residual stress
hydrotest
expanding
slit-ring method
