Stainless steel seamless elbows are connectors for turning pipes such as water pipes and gas pipes. Flexible turning is achieved through 45°, 90°, 180° and other angle designs.
If you want to detect microcracks on the surface of stainless steel seamless elbows, you can screen from two directions: penetration testing and visual inspection.
Penetration testing is to penetrate the surface of the elbow with a penetrant to open cracks, and the developer is visible to the naked eye after coloring. This method is more suitable for non-magnetic materials (such as austenitic stainless steel) and can detect microcracks with a width of ≥0.01mm.
Visual inspection is to use the naked eye or a magnifying glass to directly observe the surface abnormalities of stainless steel seamless elbows. The naked eye can only identify obvious cracks (≥0.1mm), and it is easy to miss hidden defects.
In addition, eddy current testing, ultrasonic testing, and X-ray flaw detection can also be used for auxiliary detection.
Eddy current testing is to identify surface cracks through electromagnetic induction, but it is ineffective for non-conductive materials; ultrasonic testing can detect deeper cracks (>1mm), but has low sensitivity to open shallow surface microcracks; X-ray flaw detection is mainly used for internal defects such as pores and slag inclusions, and the efficiency of surface crack detection is insufficient (the sensitivity is lower than that of penetration testing). For fine surface cracks, it is recommended to use penetration testing more effectively, supplemented by visual inspection for preliminary screening, and complex scenes can be combined with ultrasound or X-rays for complex defect detection.