Is high frequency a standard feature on all GTAW power sources?

• A. Yes
• B. No
• C. Sometimes
• D. Only in DC power sources

Answer: (B)

High-frequency ignition is a common way to start a TIG arc without touching the work, but it isn’t present on every GTAW power source. Some welders use lift-arc or touch-start methods, especially on DC-only or budget machines, which don’t include HF circuitry. Other units may offer HF as an option or only for AC TIG, but it isn’t universal. So, high frequency is not a standard feature on all GTAW power sources.