Molybdenum Electrodes Are Different
These Electrodes are different and are usually less expensive. Moly electrodes have a higher melting temperature which means that it will break down or erode more of the broken tool, tap, or drill rather than the electrode.
For Molybdenum Electrodes the diameters start at .020″
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Graphite has several advantages over other materials. It is resistant to thermal shock. It is the only material in which mechanical properties increase with temperature. It has a low CTE for geometrical stability. It is easily machined. It does not melt but sublimes at very high temperature (3,400ºC), and finally, its density is lower (five times less than copper) which means lighter electrodes. Graphite removes material better than copper or copper-tungsten while wearing slower. The wear rate tends to diminish as the discharge increases, unlike copper, whose wear increases at higher currents. Therefore, graphite is suited for the machining of large electrodes since working with a high current intensity provides decreased roughing time.
Although graphite is prone to abnormal discharge, this can be eliminated through quality flushing, and lowering the intensity of discharge during negative polarity machining. However, as a result of this tradeoff, machining tungsten carbides is more difficult than with copper-tungsten electrodes. Also, since graphite is a ceramic, it is sensitive to mechanical shock, and consequently must be handled and machined with care.
For Graphite Electrodes the diameters start at 3/8″(9.5 mm)
For Graphite Electrodes the minimum power supply requirements are 15 KVA or higher
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Molybdenum (Moly) Electrodes
Moly Electrodes have a higher melting temperature which means you will erode more of the broken tool and less of the electrode making Moly less expensive to use than other materials.
When removing large bolts .750″ to 19 mm and up use Graphite Electrodes for optimum performance and value. Graphite Electrodes only work on metal disintegrators with 20KVA or DC power supply.
Square, Hex, and custom Graphite Electrodes are available upon request.