Question
Download Solution PDFBy which of the following is the welding current in an AC welding transformer controlled?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe 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.
Last updated on Jun 7, 2025
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