How to test the pipe cap

　　The X-ray detection method is applicable to the detection of internal defects of pressure vessel cap shell or butt weld. Generally, the thickness of steel suitable for detection by X-ray flaw detector is less than or equal to 80mm, the detection thickness range of lr-192 is 20 ~ 100mm, and the detection thickness of Co-60 is 40 ~ 200mm.

　　2、 Surface inspection

　　Magnetic particle or penetration method is usually used for surface inspection of steel plate groove, fillet weld and butt weld when manufacturing pressure vessel pipe cap, and also for surface inspection after machining such as large forgings.

　　3、 Ultrasonic testing

　　Ultrasonic testing method is applicable to the detection of internal defects in butt welds of pressure vessel cap shell with thickness greater than 6mm.