Physics · Welding Technology
In a direct current (DC) electric welding arc, why does the heat generated at the cathode and anode spot regions typically differ?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Due to distinct electrode work functions, compositions, and plasma interface properties✓
- 2Because the local plasma column temperature is lower than the solid cathode temperature
- 3Because free electrons are exclusively emitted from the positive anode surface
- 4Due to perfectly symmetric kinetic energy transfer across the entire plasma column
Correct answer
Due to distinct electrode work functions, compositions, and plasma interface properties
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