Secrets of a Successful Furnace Brazing Process
What is the difference between Soldering, Brazing, and welding?
Welding refers to the process of creating a metallurgical bond between two components by way of using high energy to melt the base components (and sometimes a filler material), forming a mixed alloy of the two base parts.
Soldering is the process of joining two components by way of melting a filler material to act as a “glue” between the parts to be joined. The “glue” is another metallic compound that has a lower melting point than the metals to be joined. At the precise temperature just above the melting point of the filler material and below that of the base materials, the filler material will flow into the voids between the carefully positioned base parts by way of a process called capillary action. When the joined assembly is removed from the heat, the filler material will solidify into a durable, airtight, joint.
Similar to a soldering process, brazing takes place at higher temperatures, typically over 450°C in order to create a joint with more strength using stronger filler materials.
Brazing can be accomplished via handheld or fixed torch in the open air, but in order to achieve the best possible brazed joint you need to remove as much oxygen as possible. This is where furnace brazing comes into play. Brazing furnaces displace the oxygen surrounding the work environment to allow for the ideal brazing conditions. Read more