Why is it important to keep the flame moving while brazing?

Keeping the flame moving while brazing is crucial to prevent damaging the tube or the materials being joined. When the flame is held in one spot for too long, it can create excessive localized heat, leading to overheating and potentially melting or warping the metal components. This can compromise the integrity of the joint or even cause the material to burn through. By moving the flame consistently, the heat is distributed more evenly across the surface, reducing the risk of damaging the workpiece and ensuring that both parts reach the appropriate temperature for effective brazing without adverse effects. This technique allows for optimal heat application, promoting a stronger and more reliable bond while preserving the materials' structural integrity.