Defect is connected by its nature, quantity, causes and there were all located at different extent, weakened the performance of welded joints, and also reduces its welded steel performance.
Spiral piling pipe welding defects, such as porosity, slag, incomplete fusion, incomplete penetration welds and other defects have reduced the cross-sectional dimensions and gold session densification; open type cracks, cracks and weld root interlaminar cracks on the degree of harm more serious. For the weld can be checked by ultrasonic flaw detection, radiography examination, penetrate, magnetic particle, eddy current testing and other means to determine the weld quality is satisfactory, you can also take the appropriate repair measures to eliminate defects, to reach qualified targets. However, non-destructive testing methods can only detect the static quality of the weld, and for the spiral steel pipe welded structure in the course of changes in the quality weld bead is very difficult to implement the pre-detection; while those at risk of defects in the structure before the course gradually exposed, and even lead to catastrophic accidents. Cracks, especially delayed cracking, sudden brittle fracture are some categories of dangerous defects.
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