Two soft pieces of copper tubing of the same size can be joined together without fittings by __________ the pipe.

• A. Swaging
• B. Soldering
• C. Welding
• D. Brazing

Answer: (A)

Swaging is a mechanical method for joining copper tubes without additional components. By swaging the end of one tube, you shape it so that its end can be inserted into the end of the second tube, creating a tight butt-type joint with no extra fittings or filler metal. This approach is quick and keeps the joint compact, which is why it’s used when two same-size soft copper tubes need to be connected without fittings. Soldering, brazing, and welding all involve adding filler material and/or applying heat, which goes beyond a no-fittings mechanical join. Swaging provides a straightforward, material-only connection suitable for end-to-end copper tube runs.