The GATE Grind

GATE 2026 PI – Question 12

Manufacturing Processes I · Joining of Materials · 1 mark · Multiple choice

Which statement about brazing filler material is FALSE?

  1. Its melting temperature must be below that of the base metal.
  2. Its wettability of the base metal must be low.
  3. Its viscosity must be low for penetration into the interface.
  4. Chemical reactivity between filler and base metal must be low.

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Correct answer: (B) Its wettability of the base metal must be low.

Explanation

Brazing melts the filler while the base metal stays solid. The liquid must wet the surfaces well and flow into the joint by capillary action; low viscosity assists this. Therefore the demand for low wettability is false: **B**. Excessive chemical reaction is undesirable.

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