However, there are certain limitations to brazing too. Since the brazing metal never penetrates the base metal, the strength of the joint is less when compared to welded joints. In fact, the strength of the brazing metal is always less than that of the base metal. Also if the operational temperature of the base metal is high, then it might even lead to melting of the brazed joint. The brazed joints at times might have a different color than the base metal.
Brazing is preferred in linear and overlapping joint creations. They also work perfectly in thin layers.
These are the metals which are used for brazing. They are copper, silver, coated brass filler, nickel, aluminum, steel, and magnesium.A good brazing metal should have a compatible melting temperature with the base metal. It should be ideally lower than that of the base metal. The metal should also have low surface tension. Also, the fluidity should be high for proper capillary action. There should be no chemical interaction with the base metal.
Depending upon the application the brazing metal comes in form of powder, metal wire, rods, sheets, and stripes.