Which metals are effectively used with a rolling-type flaring tool?

The use of a rolling-type flaring tool is particularly effective with soft copper, brass, and aluminum. These metals have the properties needed to form a consistent and reliable flare without cracking or breaking.

Soft copper is malleable, allowing it to be shaped easily by the rolling action of the tool, which creates a uniform flare essential for sealing fittings in refrigeration systems, fuel lines, and other applications where a leak-proof connection is crucial. Brass, being an alloy of copper and zinc, retains similar malleability characteristics, making it suitable for the same type of flaring. Aluminum, though structurally different, is also relatively soft when compared to harder metals and can be adequately shaped using the rolling flaring technique.

The rolling tool works by gradually bending the end of the metal tube, which helps avoid the risks associated with cracking that can happen with harder metals such as stainless steel. While a rolling-type flaring tool may work on some softer metals and be limited with others, the combination of soft copper, brass, and aluminum ensures optimal performance and a robust connection. This is why this choice is recognized as the best option among the provided alternatives.