Finite Element simulation of In-Service Sleeve Repair Welding of Gas Pipelines
The purpose of this study is to investigate the influence of welding sequence on the risk of bum-through,cold cracking and residual stresses during in-service sleeve repair welding of gas pipelines.Based on ABAQUS software,axisymmetric finite element models were conducted to calculate transient temperature distributions and resulting residual stress field after multi-pass sleeve fillet welding of in-service API 5L-X65 36 Schedule pipes.Influence of welding sequence was investigated by comparing residual stresses and transient deformations for sequential welding;in which welding of the two circumferential pipe/sleeve fillet welds was made in sequence,to the case of performing the two welds at the same time.Sequential welding was found to reduce weld zone distortion and residual stresses due to the sleeve freedom to expand axially while conducting the first fillet weld.The upper limit of heat input was found to generate higher pipe wall peak temperature,but not to the extent of initiating pipe wall melt through.
sleeve repair welding residual stresses melt through gas pipelines welding sequence
Ahmed R.Alian Mostafa Shazly Mohammad M.Megahed
2nd floor-Building 15-Faculty of Engineering,Cairo University,Giza,Egypt 2nd floor-Building A-The British University in Egypt,Ai-Shorouk City,Egypt 3rd floor-Building 10-Faculty of Engineering,Cairo University,Giza,Egypt
国际会议
济南
英文
957-961
2012-12-29（万方平台首次上网日期，不代表论文的发表时间）