Tweco N7500 - Manual (Page 23)

Manual 89250890 3-7 SYSTEM COMPONENT DESCRIPTION
SYSTEM COMPONENT DESCRIPTION N7500
3.04 Electrodes
The most important part of the N7500 System is the electrode. Since the N7500 system uses only DC power, the
electrodes must be formulated and manufactured for use exclusively with Direct Current.
The use of Victor Arcair Jointed Jetrods Copperclad DC Electrodes is highly recommended. These electrodes are
manufactured to Victor Arcair specifications to provide the best electrical conductivity, to maintain proper electrode
diameter at the point of the arc, and to minimize carbon sublimation. A male/female joint enables electrodes to
be joined together while the gouging operation is taking place.
Electrode Diameter Gouge Width Amperage
Inch mm Inch mm Min Max
5/16 7.9 7/16 11.1 400 450
3/8 9.5 1/2 12.7 450 600
1/2 12.7 13/16 20.7 800 1000
5/8 15.9 15/16 24.9 1000 1250
3/4 19.1 1 1/16 27.0 1250 1600
Chart 3-11: Electrode Selection
The formulation and design of the Jetrods Electrodes embody numerous laboratory-proven advantages under the
user’s production conditions. Among these advantages are:
• Cooler operation due to a small incandescent area at the tip and joint
• Excellent arc stability
• High metal-removal rates
• Uniformity of diameter
• Clean grooves or cuts