Red Seal Steamfitter/Pipefitter Practice Exam

What is the primary function of soldering in copper pipes?

1. To create a strong bond between two metal surfaces

2. To fill the joint between two copper pipe fittings

3. To provide insulation to the pipes

4. To protect against corrosion

The correct answer is: To fill the joint between two copper pipe fittings

The primary function of soldering in copper pipes is to fill the joint between two copper pipe fittings. Soldering involves the melting of a filler metal, known as solder, which then flows into the space between the fitting and the pipe. Upon cooling, this creates a strong, watertight seal that holds the two components together securely. This process is essential in plumbing to ensure that water does not leak from the joints, as leaks can lead to significant damage and inefficiencies in a plumbing system. While creating a strong bond, providing insulation, and protecting against corrosion may be relevant to other processes or materials in plumbing and piping systems, they do not accurately represent the primary purpose of soldering in this context. The focus of soldering is specifically on forming a reliable, leak-proof connection at the joints of copper pipes and fittings.