Which of the following is NOT a method to inspect welds?

Vacuum forming is a process primarily used in the manufacturing of plastic parts and products, where a sheet of plastic is heated and then formed over a mold using a vacuum. This method does not relate to the inspection of welds, which are critically evaluated to ensure their integrity, strength, and quality in metal fabrication.

In contrast, ultrasonic testing, visual inspection, and radiographic testing are all recognized methods used specifically for inspecting welds.

Ultrasonic testing involves using high-frequency sound waves to detect imperfections within a weld, while visual inspection relies on the trained eye of an inspector to identify surface defects or irregularities. Radiographic testing employs X-ray or gamma-ray technology to produce images of the weld, allowing for an analysis of internal structures and potential flaws. Each of these techniques is essential in the welding industry to prevent failure and ensure safety in structures and components.