大口径钢制燃气管道镶焊过程初始应力的分析与研究

The Analyzes and Research on the Pre-stress in the Large Caliber Steel Gas Pipe's Set-welding

燃气管道,特别是大口径(DN≥500mm)钢制燃气管道在路面拘束状态下失圆较大,且新旧管道镶焊往往不在一轴线上,因此镶焊过程中焊口存在初始应力。因此需要考虑初始应力和拘束状态对焊缝及其热影响区的应力应变状态的影响,确保管接头焊接质量。文章通过建立预应力分量计算模型,对镶焊过程进行模拟试验、测试、分析,为实际镶焊过程合理选择点焊位置、减少初始应力对镶焊的影响提供了依据和方向。

The article introduces some standards such as quality standards and engineering construction standards, listing two kinds of under-pressure drilling ＆ plugging devices, discussing some electro fusion technology, and puts forward the suggestion for the extension of Under-pressure Drilling and Plugging technology as well.