At what angle should the filler metal be fed into the face of the joint?

Feeding the filler metal into the face of the joint at an angle of 45 to 90 degrees is considered ideal because this range allows for better control and proper penetration into the joint. When the filler metal is introduced at a steeper angle, it ensures that the molten metal can flow effectively along the joint, filling gaps and achieving a strong bond. This technique enhances the likelihood of achieving a uniform distribution of the filler throughout the joint, which is crucial for the structural integrity of the brazed connection.

In contrast, when the filler metal is fed at angles smaller than 45 degrees, or excessively steep angles over 90 degrees, the flow may be less controlled, leading to improper filling and potentially weaker joints. This makes the choice of a 45 to 90-degree angle especially advantageous for achieving optimal results in brazing applications.