What is the primary purpose of soldering in metalworking?

The primary purpose of soldering in metalworking is to join metal pieces using a filler metal that melts at a lower temperature than that of the base metals being joined. This process allows for the creation of a strong bond between two metal parts without bringing them to their melting point, which is critical in applications where the integrity of the base materials must be maintained. Soldering typically utilizes filler metals like lead-tin alloys or other low-melting-point materials, which flow into the joint and solidify, thus creating a physical and often electrical connection.

The importance of soldering extends into various fields, including electronics, plumbing, and HVAC, where it is essential to assemble components securely. This joining method is particularly beneficial for delicate or heat-sensitive components, as it minimizes thermal stress and potential damage.

The other options focus on processes that do not involve the joining of metals through the melting of filler material, demonstrating a clear distinction in purpose within metalworking practices.