Toughness And Fatigue Strength Of Spiral Welded Pipe

The development trend of pipelines is large diameter and high strength. As the diameter of the steel pipe increases and the grade of steel used increases, the tendency of the ductile fracture tip to expand steadily increases. According to tests conducted by relevant research institutions in the United States, although spiral welded pipes and straight seam welded pipes are of the same level, spiral welded pipes have higher impact toughness.
Due to changes in the transmission volume of transportation pipelines, steel pipes are subject to random alternating loads during actual operation. Understanding the low cyclic fatigue strength of steel pipes is of great significance to judging the service life of pipelines.
According to the measurement results, the fatigue strength of spiral welded pipes is the same as that of seamless pipes and resistance welded pipes. The test data are distributed in the same area as seamless pipes and resistance pipes, but are higher than ordinary submerged arc straight seam welded pipes.