Which of the following is a common non-destructive testing method used in pipeline welding?

Radiographic testing is indeed a common non-destructive testing method used in pipeline welding. This technique involves using X-rays or gamma rays to examine the internal structure of a weld. It is effective in detecting imperfections such as cracks, voids, inclusions, and overall weld integrity without having to physically alter or damage the welded component.

The reason radiographic testing is widely used in pipeline applications is due to its ability to provide permanent records of the weld integrity and the ease with which it can be interpreted once the images are developed. This allows for a thorough assessment of the weld quality, which is essential for ensuring the safety and reliability of pipelines that transport various substances under pressure.

While X-ray testing and ultrasonic testing are closely related and also recognized non-destructive methods in this field, radiographic testing encompasses these techniques under its umbrella. Magnetic particle testing is generally used for surface defects in ferromagnetic materials and is not as commonly applied to pipeline welds as the other methods.