Introduction to Soldering & Brazing: They provide permanent joint to bond metal pieces. The process lie some where in between fusion welding and solid state welding. These processes have some advantages...
Definition of Brazing:
Brazing is a metal-joining process whereby a filler metal is heated above melting point and distributed between two or more close-fitting parts bycapillary action. The filler metal is brought slightly above its melting (liquidus) temperature while protected by a suitable atmosphere, usually a flux. It then flows over the base metal (known as wetting) and is then cooled to join the workpieces together. Brazing is similar to soldering, except the temperatures used to melt the filler metal are higher.
Advantages of Brazing:
Brazing has many advantages over other metal-joining techniques like welding. They are as follows:
- Brazing does not melt the base metal of the joint, it allows much tighter control over tolerances and produces a clean joint without the need for secondary finishing.
- Non-similar metals and non-metals (i.e. metalized ceramics) can be brazed together.
- Brazing produces less thermal distortion than welding due to the uniform heating of a brazed piece.
- Complex and multi-part assemblies can be brazed cost-effectively. Welded joints must sometimes be ground flush, a costly secondary operation that brazing does not require because it produces a clean joint.
- Another advantage is that the brazing can be coated or clad for protective purposes.
- Brazing is easily adapted to mass production and it is easy to automate because the individual process parameters are less sensitive to variation.
Disadvantages of Brazing:
Disadvantages of brazing are as follows:
- The lack of joint strength as compared to a welded joint due to the softer filler metals used. The strength of the brazed joint is likely to be less than that of the base metal(s) but greater than the filler metal.
- Brazed joints can be damaged under high service temperatures. Brazed joints require a high degree of base-metal cleanliness when done in an industrial setting. Some brazing applications require the use of adequate fluxing agents to control cleanliness. The joint color is often different from that of the base metal, creating an aesthetic disadvantage.
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