By which of the following is the welding current in an AC welding transformer controlled?

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RRB JE EE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. Increasing the primary voltage
  2. Varying the magnetic flux
  3. Using an electric motor
  4. Changing the output current

Answer (Detailed Solution Below)

Option 2 : Varying the magnetic flux
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The correct answer is option 2.

In AC welding transformers, the secondary (welding) current is controlled by adjusting the amount of magnetic flux that links the primary and secondary windings. This is done through various methods:

Magnetic shunts or movable cores:

  • Inserting or adjusting a magnetic shunt between the windings changes the leakage flux.
  • By increasing the leakage flux, less magnetic flux links the secondary winding, resulting in lower induced voltage and current.


Tapping or variable core transformers:

  • The tap change adjusts the turns ratio, which affects the induced voltage and load current.
  • While the core flux stays relatively constant in no-load conditions, under loaded conditions, the load current and flux changes are influenced by the tap position.
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