In brazing, the filler metal is drawn into the joint by means of _____.

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  1. friction
  2. damping action
  3. capillary action
  4. surface tension

Answer (Detailed Solution Below)

Option 3 : capillary action
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Detailed Solution

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Explanation:

Both brazing and soldering are the metal joining processes in which parent metal does not melt but only filler metal melts filling the joint with capillary action.

Brazing:

  • If the filler metal is having a melting temperature more than 420°C but lower than the melting temperature of components then it is termed as a process of brazing or hard soldering.

Soldering:

  • If the melting temperature of filler metal is lower than 420°C and lower than the melting point of the material of components then it is known as soldering or soft soldering.
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