Effect of welding on residual stress of ERW steel pipe
During the construction of natural gas and oil pipeline stations, the installation of valves, meters, and flanges should be tapped in the main channel. It is difficult to identify the straight seam position of the base pipe by high-frequency resistance welding. The installation of some lugs is very close to the welding seam. Therefore, it is very necessary to deeply study and analyze the influence of the boss on the basic pipeline. In this paper, the residual stress distribution of high-frequency longitudinal resistance welded pipe is analyzed, and the influence of welding position of a different boss on residual stress is analyzed. The stress increases sharply and the longitudinal welding residual stress is affected when the boss installed on the ERW pipe is much larger than the parent pipe. ERW pipeline The distribution of residual stress in the welded pipe is closely related to the forming process. HFW resistance welding is the cross-section of a circular tube af...