Why is brazing a better process than welding to rebuild some surfaces?

To discuss: The brazing is better process than welding to rebuild some surfaces.

Brazing: Brazing is a joining method which is used to join similar or dissimilar metals with the help of some filler material. The liquidus temperature of this filler material should be more than 427^o Celsius but it is limited by solidus temperature of base metal. The features which make the brazing process different from brazing process are as follows

1. The filler material should be an alloy of copper (Cu) and Zinc (Zn). This filler material is generally known as the filler material for brazing. This alloy of copper and zinc is known as brass.
2. The brazing material or the brass is melted, and it is used in liquid phase while joining process. This liquid brass seeps inside the joint through the capillary action.
3. The flux material used in brazing process is borax.
4. When it comes to the comparison of strengths, the strength of brazing is less as compared to the strength of brazing. The braze joint has more strength.
5. The brazing joint is used in producing leak proof joint in hydraulic circuits and pipe joining processes.

The advantages of the furnace brazing method are as follows

1. In furnace brazing method the temperature of the furnace can be controlled precisely in order to ensure that the parts to be joined don't get overheated.
2. Oxides pose a great threat while carrying out the joining process. These oxides may form due to atmospheric contamination and heating. The furnaces can provide a suitable atmosphere when filled with some inert gases. This ensures that the parts being joined do not get oxidized...