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METHODS OF GIRTH WELDING HIGH STRENGTH STEEL PIPES TO ACHIEVE PIPELINE CRACK ARRESTABILITY

机译:环焊高强度钢管以达到管道裂纹可阻性的方法

摘要

Girth welds 80 with crack arresting capability, and welding methods for producing same in high strength pipelines, are provided. Girth welds 80 according to this invention are produced in high strength pipelines by welding methods that produce (i) HAZ 84 microstructures that are softer than the pipeline steels, (ii) weld toes 81, 83, 85, and 87 that act as stress/strain concentrators, thus promoting tearing in the HAZ 84 and a ring-off fracture; and (iii) a weld geometry that promotes an inclined fracture path.
机译:提供了具有止裂能力的环缝焊缝80,以及用于在高强度管道中生产环缝焊缝的焊接方法。根据本发明的环缝焊缝80是通过焊接方法在高强度管道中生产的,该焊接方法产生(i)比管道钢软的HAZ 84微观结构,(ii)用作应力/应力的焊趾81、83、85和87应变集中器,从而促进热影响区84的撕裂和环形断裂; (iii)促进倾斜断裂路径的焊接几何形状。

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