Expanding soft copper to relieve another piece of copper of the same diameter is called?

• A. Swaging
• B. Annealing
• C. Brazing
• D. Flanging

Answer: (A)

Swaging is a metal-forming process that uses dies or rolls to change a tube’s diameter by radial deformation. When soft copper is expanded, this swaging action enlarges the end so another piece of copper of the same diameter can fit against it, effectively equalizing the diameters and easing assembly. The copper’s ductility when softened makes this expansion easier. This isn’t about heating to relieve stress (that would be annealing), nor about joining with filler metal (brazing), nor about forming a flange (flanging).