Which of the following discontinuities might you expect to find in rolled bar stock?

Laps are a common discontinuity found in rolled bar stock due to the processes involved in rolling and shaping the metal. During the rolling process, if the material flows improperly or if layers of metal overlap and do not fully fuse together, it can create a lap. This results in a discontinuity where areas of the material may not have consistent strength or structural integrity. Ensuring that the surface is free from laps is essential for the performance and reliability of the finished product.

The other discontinuities, while they may occur in different manufacturing processes or materials, are less characteristic of rolled bar stock. Shrinkage typically relates to casting processes, bleed-out refers to molten material leaking during casting, and undercut is often seen in areas subjected to excessive machining or shaping rather than in rolled products. Understanding how rolling impacts the material helps in identifying and addressing potential laps in the production of bar stock.