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Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695

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BuyFindarrow_forward

Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695
Textbook Problem
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Why can brazing be both a permanent and a temporary joining method?

To determine

The reason for brazing to be a permanent as well as temporary joining method.

Explanation

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 427o Celsius but it is limited by the solidus temperature of base metal.

The capillary action is defined as the force acts on the meniscus of liquid. When the adhesion force is greater than the cohesion force, the liquid climbs up the walls due this capillary action.

Figure 1: The capillary action which pulls the water into a thin tube.

The brazing process is carried out at a temperature above 450oC and the parts to be joined are kept at a very close distance. The distance between the parts is generally 0.4 mm to 0.6 mm. The small spacing ensures that the liquid metal seeps inside the small spacing through capillary action...

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