Final answer:
Clinching is the process that locally interlocks two pieces of metal together without significant heat; it uses a punch and die to create a mechanical interlock. This is different from welding, soldering, or using bolts and rivets.
Step-by-step explanation:
The process described in the question, which locally interlocks two pieces of metal together without the use of heat to the extent of welding, is known as clinching. This method is mechanical and joins metal sheets by pressing them together with a punch and die, creating an interlock that holds the sheets together. It's a common alternative to welding, soldering, or using bolts and rivets, as it doesn't require additional materials or significant heat application. Clinching is often used in the automotive industry for its speed and reliability. So, the correct answer to the question is D. Clinching.