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Residual stress test on welding repair structure of drilled pipeline |
BUWen-ping1,SHUAI Jian2,WANG Xiao-ming2,ZHANG Jin-jun1
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(1.Faculty o f Petroleum Engineering in China University of Petroleum,Beijing 102249, China;2. Faculty of Mechanical and Electronic Engineering in China University of Petroleum, Beijing 102249, China)
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Abstract: |
Some oil transmission pipelines are often drilled holes by oil stealers. These drilled pipelines must be repaired by welding way in time. The residual stress produced in welding process has effects on the loading capability and service life of pipelines. The residual stress tests were conducted on different weld structures of repaired pipelines by drill-hole method in order to investigate the influence of welding repair on pipeline integrity. The test results show that there exists the residual stress near a weld seam, and the closer distance from a weld seam is, the higher residual stress is. The first principal stresses of residual stresses on welding repair of the drilled pipeline are mostly tensile. The highest residual stress in tensile is about 70.94% of the yield limit of pipe material. Whereas the second principal stresses of residual stresses near a spiral weld seam are compressive. The highest residual stress in compression is about 74.66% of the yield limit of pipe material. In addition, the high residual stress occurs at the bottom of a tube welded on pipelines. |
Key words: oil pipeline welding residual stress drilling holes repair |
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