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Brazing is a welding process, which produces coalescence of materials by heating them to a suitable temperature and by using a filler metal having melting point above 450°C. The filler metal is distributed between closely fitted surfaces of the joint by capillary action.
The placement of the filler metal affects the quality of the joint. For normal lap joints, the filler metal should be supplied from one end only and allowed to flow completely through the joint by capillary action.
The correct fluxing material must be used. The placement of the flux also affects the quality of the brazed joint. Paste flux is the most common from and is usually spread over the surfaces to be joined. It is also painted on the pre-placed brazing filler materials.
For some of the brazing methods a special atmosphere is used instead of flux, which is selected based on the metals being joined. When atmospheres are used flux may not be required. The atmosphere is the product of the combustion of the flame. The neutral or reducing flame is usually used. A slightly oxidising flame may be used for certain other materials. The general guideline for selection of flames is given below
Base Metal Flame Type
Aluminiums Slightly reducing
Brasses Slightly oxidising
Bronzes Slightly oxidising
Copper Neutral
Cupro-nickel Reducing
Inconel Slightly reducing
Cast Iron Neutral
Wrought Iron Neutral
Monel Slightly reducing
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