INVESTIGATION OF ELECTRODE EROSION IN HIGH CURRENT ELECTRIC ARCS.
Abstract
Experiments on electrode erosion due to magnetically driven high current arcs are described together with a review of the literature. The range of parameters is: arc current 2 to 30 KA, pressure in various gases up to 4 atm, magnetic field strength up to 6 KG. The arc travels in a uniform magnetic field between segmented rail electrodes. The self-magnetic field of the current feed rails is reduced to a negligible level. Measurements of the arc velocity are given. Test plates of various metals are placed between the electrode rails. They are traversed by the moving arc so that the plates are exposed to the anode attachment on one side and to the cathode attachment on the other side. The thermal and electrical properties of various electrode metals have been compiled. The relative erosion resistance of the metals is evaluated. High-speed photos have indicated that the moving arc attaches in one or several simultaneous attachment spots at anode and cathode. The lifetime of these attachment spots was found to be in the range from 1 to 20 microseconds on copper electrodes. They emit a high velocity jet of plasma which influences the stability and propagation of the travelling arc. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1968
- Accession Number
- AD0675185
Entities
People
- Rolf Dethlefsen
Organizations
- General Dynamics