焊道简化对油气管道对接接头残余应力的影响研究  

Study of Influence of Weld Seam Simplification on Residual Stress of Butt Joint of Oil and Gas Pipeline

作　　者：边开磊[1] BIAN Kailei(China Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065000,China)

机构地区：[1]中国石油天然气管道工程有限公司

出　　处：《热加工工艺》2019年第23期151-154,共4页Hot Working Technology

摘　　要：在不影响计算精度的前提下,为有效提升大型结构件数值模拟计算效率,以油气管道对接接头为研究对象,建立了有限元模型,分别为三层六道焊、三层三道焊和单层单道焊。采用X射线衍射法测量残余应力,验证了有限元模型,并对比了焊道简化对残余应力的影响。结果表明,有限元模型获得的应力结果和试验结果趋势吻合,有效证明了有限元模型的正确性。在计算精度方面,轴向上残余应力模拟结果误差较大。在计算效率方面,与三层六道焊相比,焊道简化为三层三道焊后,计算效率提升了30.2%;简化为单层单道焊后,计算效率提升了49.2%。因此,在平衡计算效率和计算精度的前提下,焊道简化为三层三道焊对实际生产指导意义更大。On the premise of not affecting the accuracy of calculation,in order to improve the efficiency of numerical simulation of large-scale structural parts,taking the welded joint of oil and gas pipeline as the research object,the finite element model was established,which is three-layer-six-bead welding,three-layer-three-bead welding and single-layer-single-bead welding.The finite model was validated by X-ray diffraction method,and the effect of weld seam simplification on residual stress was compared.The results show that the stress results obtained by the finite model coincide with the test results,which effectively proves the correctness of the model.In terms of calculation accuracy,the simulation results of axial residual stress have a larger error.In terms of calculation efficiency,the calculation efficiency increases by 30.2%when the weld bead is simplified into three-layer three-bead welding and the calculation efficiency increases by 49.2%when the bead is simplified into single-layer single-bead welding.Therefore,on the premise of balancing computational efficiency and accuracy,three-layer three-bead welding is more significant for practical production.

关 键 词：焊道简化 油气管道 对接接头 残余应力 

分 类 号：TG404[金属学及工艺—焊接]