Why is the boiling point of the brazing filler important?

The significance of the boiling point of the brazing filler highlights the need for it to remain lower than the melting point of the base metals being joined. This is crucial because, during the brazing process, the filler metal must be heated sufficiently so that it can flow and fill the joint but not to the extent that it causes the base metals to melt. If the temperature reaches the melting point of the base metals, it can lead to weakening or compromising the integrity of the joint, as the base metals can deform or lose their original properties. Therefore, maintaining the temperature below the melting point of the base metals ensures that the structure remains intact and that the brazing process can effectively create a strong bonded joint without adversely affecting the base materials.