What part of the flame envelope should be touching the base metal during silver brazing?

The tip of the flame, also referred to as the "feather," is the most concentrated part of the flame envelope and reaches the highest temperature. During silver brazing, it is crucial for proper heat application that this part of the flame comes into contact with the base metal. The intense heat at the tip allows for melting the filler material effectively and creating a strong bond.

Using the tip helps to focus the heat directly where it is needed, ensuring that the brazing filler flows properly into the joint. This precise application not only enhances the quality of the bond but also minimizes the risk of overheating adjacent components, which can lead to distortion or damage. Thus, for achieving optimal results in silver brazing, positioning the tip of the flame against the base metal is paramount.