Defects in Fusion Zone of J55 Oil Casing
Defects in the J55 oil casing fusion zone:
After the ERW oil casing, the weld pipe in the heat affected zone of the fusion line was found to be unqualified. The metallographic analysis, scanning electron microscopy, and process investigation were performed. The results showed that the J55 welded pipe was in the fusion line. There is a certain depth of crack defect in the edge of the original plate in the heat-affected zone. The user has a significant expansion of the crack defect due to the small pipe diameter and the insufficient amount of trimming in the pipe making process. The cracks in the edge of the hot-rolled original plate originate from cast slab corners and side subcutaneous bubbles.
After the ERW oil casing, the weld pipe in the heat affected zone of the fusion line was found to be unqualified. The metallographic analysis, scanning electron microscopy, and process investigation were performed. The results showed that the J55 welded pipe was in the fusion line. There is a certain depth of crack defect in the edge of the original plate in the heat-affected zone. The user has a significant expansion of the crack defect due to the small pipe diameter and the insufficient amount of trimming in the pipe making process. The cracks in the edge of the hot-rolled original plate originate from cast slab corners and side subcutaneous bubbles.
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