Magnetic Particle Inspection Level 2 Practice Exam

Which one of the following is not a discontinuity common to rolled products?

1. Seams

2. Laminations

3. Cold shuts

4. Cracks

The correct answer is: Cold shuts

Cold shuts are not typically a discontinuity associated with rolled products. Instead, cold shuts usually refer to issues that occur during the casting process, where metal does not fully fuse together, leading to gaps or incomplete sections. This type of flaw is more relevant to cast materials rather than rolled products, which are subjected to processes like rolling, forging, or extrusion. On the other hand, seams, laminations, and cracks are all discontinuities that can be present in rolled products. Seams result from the welding of edges during the rolling process, laminations are layers that may not bond properly during rolling, and cracks can develop due to stress or inappropriate handling of the material. Thus, understanding the nature of cold shuts and their association with casting rather than rolling is crucial in distinguishing between discontinuities specific to rolled products.