The main difference between soldering and brazing is the temperature at which each process takes place. Soldering occurs at a temperature below 840°F (450°C), while brazing occurs at a temperature above 840°F (450°C).
In soldering, a filler material with a lower melting point than the base materials is melted to act as a "glue" between the parts to be joined. The filler material flows into the voids between the base parts through capillary action. When the assembly is removed from the heat, the filler material solidifies, creating a durable and airtight joint. Soldering is often used for joining delicate materials and can result in weaker connections.
On the other hand, brazing takes place at higher temperatures, typically over 840°F. Stronger filler materials are used in brazing to create joints with more strength. The base materials and the filler material are melted and alloyed together, creating a strong bond. Brazing can be accomplished through handheld or fixed torches in the open air, but to achieve the best possible brazed joint, it is recommended to use a brazing furnace to remove as much oxygen as possible.
Overall, both soldering and brazing are joining techniques that use a filler metal to connect components without melting the base materials. The choice between soldering and brazing depends on factors such as the melting point of the base materials, the desired strength of the joint, and the specific application.
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