Which factor determines whether to use soldering or brazing?

The correct answer is based on the temperature requirements of the process. Soldering and brazing are both methods of joining metal parts, but they operate at different temperature ranges. Soldering typically uses lower temperatures, generally below 450°C (842°F), and is often used for joining materials that cannot withstand higher heat, such as certain metals and plastics. In contrast, brazing requires higher temperatures, usually above 450°C, allowing it to be used on a wider variety of materials and providing stronger joints due to the increased thermal energy involved.

When determining which method to use, the critical factor of temperature requirements helps guide the choice based on the materials involved and the strength needed for the joint. This ensures that the joining process aligns with the material characteristics, providing a successful and reliable bond.