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.
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。
2
The gas pool position of trachea casing pipe, the end position of the trachea casing pipe and the position of trachea hoop against anonymous artery.
对气管套管气囊的位置、气管套管末端的位置及无名动脉对应的气管环的位置进行了观察。
3
The systemic study on reliability and reinforcement technique about hoop-stove chimney of the Bao-steel incorporated company steel pipe factory is made.