A spelter used in brazing is commonly made of

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Rosin Iron base and lead alloy
  2. Copper base and silver alloy
  3. Lead sulphide
  4. Zinc chloride

Answer (Detailed Solution Below)

Option 2 : Copper base and silver alloy
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Explanation:

Brazing is a process of joining two similar or dissimilar metal pieces by means of heat and a special non-ferrous filler metal known as spelter (an alloy of copper and zinc, copper and aluminium, copper and silver).

Some of the more common types of filler metals used are

  • Aluminium-silicon alloys
  • Copper
  • Copper-silver alloys
  • Copper-zinc alloys (brass)
  • Copper-phosphorus alloys
  • Copper-Gold alloys
  • Magnesium-aluminium alloys
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