How much film must protrude on either side of the joint?

How much film must protrude on either side of the joint?

• A. 12 mm (1/2 inch)
• B. 6 mm (1/4 inch)
• C. 24 mm (1 inch)
• D. 8 mm (1/3 inch)

Answer: (A)

In radiographic inspection, you need a margin beyond the weld so the entire joint is captured on the film and nothing essential is cut off at the edges. Protruding 12 mm (1/2 inch) on each side provides a sufficient border to ensure the root, toe, and heat-affected zones of the weld are fully visible in the radiograph, which is crucial for detecting defects and accurately interpreting the weld quality. This extra margin also helps with positioning and reduces edge-cutoff or cropping that could obscure defects near the ends of the joint.

In radiographic inspection, you need a margin beyond the weld so the entire joint is captured on the film and nothing essential is cut off at the edges. Protruding 12 mm (1/2 inch) on each side provides a sufficient border to ensure the root, toe, and heat-affected zones of the weld are fully visible in the radiograph, which is crucial for detecting defects and accurately interpreting the weld quality. This extra margin also helps with positioning and reduces edge-cutoff or cropping that could obscure defects near the ends of the joint.