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GATE 2016 ME (ME1) – Question 31

Casting, Forming and Joining Processes · Welding, brazing, soldering and adhesive bonding · 1 mark · Multiple choice

Under optimal conditions of the process the temperatures experienced by a copper work piece in fusion welding, brazing and soldering are such that

  1. Twelding > Tsoldering> Tbrazing
  2. Tsoldering > Twelding > Tbrazing
  3. Tbrazing >Twelding > Tsoldering
  4. Twelding > Tbrazing > Tsoldering

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Correct answer: (D) Twelding > Tbrazing > Tsoldering

Explanation

Fusion welding melts the base metal locally, requiring the highest temperature. Brazing melts a filler above the soldering range while keeping the base metal solid; soldering uses lower-melting filler. Consequently **Twelding>Tbrazing>Tsoldering, D** under the stated process comparison.