油气长输管线现场环焊缝接头的焊接质量是决定管线质量、寿命的最根本要素。
The welding quality of field-welded girth joints of long-distance oil and gas transmission pipelines is the key to the quality and service life of pipelines.
本文利用ADINA非线性分析有限元程序，对低碳钢管道环焊缝接头焊接残余应力进行计算。
In this paper, the residual welding stresses in a low carbon steel girth butt welded pipe are calculated with a nonlinear finite element code ADINA.
在管道接头外表面焊缝中心处的轴向残余应力为压应力，而环向残余应力为拉应力。
On the outer surface of the pipe, the axial residual stresses of the weld and in its vicinity are compressive while the hoop stresses keep tensile.
结果表明：焊接接头横截面宏观结构特征表现为焊核区的“洋葱环”和热-机械影响区的塑性流线变形，洋葱环的环间距随着距焊缝中心距离的增大而减小；
The experiment result shows that the spacing of onion rings, which is the most prominent features of most friction stir welds, decreases with the distance of onion ring to centerline increasing .
结果表明：焊接接头横截面宏观结构特征表现为焊核区的“洋葱环”和热-机械影响区的塑性流线变形，洋葱环的环间距随着距焊缝中心距离的增大而减小；
The experiment result shows that the spacing of onion rings, which is the most prominent features of most friction stir welds, decreases with the distance of onion ring to centerline increasing .
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