Physics · Welding Technology
What is the primary mechanism responsible for heat generation at the cathode spot region in an electric welding arc?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Thermal radiation originating from the core plasma column
- 2Elastic and inelastic collisions purely among neutral gaseous atoms
- 3Positive ionic bombardment hitting the cathode surface✓
- 4Localized ohmic resistance heating due to melting of the core filler wire
Correct answer
Positive ionic bombardment hitting the cathode surface
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