Influence of length of X80 steel pipe tie-in on residual stress near the weld
The rapid development of the economy brings the wide application of high steel pipelines with thin walls and large diameters.Tie-in is indispensably used to connect two sides of the pipeline due to many external factors on pipeline laying in the actual construction process.The length of the tie-in is variable,so finite element analysis and ECA evaluation of the weld are carried out towards the change of the tie-in pipeline length.The influence of different lengths of tie-in pipelines on the residual stress near the weld is studied.According to the finite element results,the residual stress near the weld decreases significantly with the increase in pipeline length.When the pipeline length is greater than 3 000 mm,the decline of residual stress slows down.Then,ECA evaluation studies were carried out for different length of tie-in considering the influence of residual stress.The evaluation results show that the acceptable critical crack size increases with the increase of the length of the tie-in.Therefore,in the acceptable range,to reduce the residual stress concentration near the weld as much as possible,the pipeline length on both sides of the joint should be appropriately increased.
万方数据
维普
