What type of joint is created between pipes or fittings that is not welded, brazed, caulked, soldered, or heat fused?

The correct answer is a mechanical joint, which is designed to connect pipes or fittings without the need for welding, brazing, caulking, soldering, or heat fusion. Mechanical joints typically involve the use of physical fasteners, such as bolts, clamps, or gaskets, allowing for easy assembly and disassembly. This method provides flexibility in installations, making it easier to maintain or replace components as necessary.

Mechanical joints are commonly used in applications where the ability to disconnect lines for maintenance or repair is important. They can also accommodate some movement due to expansion or contraction, making them suitable for various environments.

In contrast, other types of joints listed, such as brazed and welded joints, involve processes that permanently join materials through heat, whereas caulked, soldered, and heat-fused joints employ different methods to create seals or connections that are not easily reversible.