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What is the main purpose of brazing in metalworking?

  1. To join metals at low temperatures using ferrous materials

  2. To connect two metals at a temperature above 800°F using a non-ferrous filler

  3. To solder electronic components using tin and lead

  4. To fuse plastic and metal through high heat

The correct answer is: To connect two metals at a temperature above 800°F using a non-ferrous filler

The main purpose of brazing in metalworking is to connect two metals at elevated temperatures typically above 800°F, using a non-ferrous filler material. This process involves melting the filler metal, which then flows into the joint between the two base metals through capillary action, forming a strong bond upon cooling. The use of a non-ferrous filler differentiates brazing from other joining methods, such as welding or soldering, where different materials and temperatures are applied. This high-temperature joining process is essential for applications requiring strength and durability, making it suitable for various industrial usages. The capability to bond dissimilar metals is another advantage that distinguishes brazing, offering versatility in fabrication processes.