Red Seal Welder Practice Exam

Which of these is NOT a method of non-destructive testing?

1. Radiographic testing

2. Bend testing

3. Ultrasonic testing

4. Dye penetrant testing

The correct answer is: Bend testing

Bend testing is primarily considered a destructive testing method because it involves bending the specimen to assess its ductility and the presence of defects. The process typically leads to some level of permanent deformation or breakage of the material, thereby making the sample unsuitable for further use. In contrast, radiographic testing, ultrasonic testing, and dye penetrant testing are all non-destructive testing methods. Radiographic testing uses X-rays or gamma rays to create images of the internal structure of a material, allowing the detection of internal flaws without damaging the sample. Ultrasonic testing employs high-frequency sound waves to detect imperfections within materials, while dye penetrant testing involves applying a liquid dye to the surface of a material, which penetrates any existing surface cracks and allows for visual inspection without causing any harm to the material. Understanding the differences between testing methods is crucial for selecting the correct approach to evaluating material integrity in various applications.