X-ray nondestructive testing film

1, the outer diameter of the pipe is 325, the flange is 300, and the nominal size of the flange is in accordance with the inner diameter, which are exactly matched. 2. The number of shots of each weld: 325 * 3.14/(300-2 * 25) = 4.08, take 5; 325*3. 14 is the total weld length, and 300-2 * 25 is the weld length that can be photographed for each film (the film length is 300, and both sides are reduced by 25), so each weld needs to be photographed five times to achieve 100% flaw detection.