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There are many other applications for Sunstone’s line of Capacitive Discharge Welders. Let us know
if you nd a unique use for our welding equipment.
Chapter 2: Resistance Welding
What is Capacitive Discharge Resistance Welding?
Capacitive discharge resistance welders, also called capacitive discharge or CD welders, utilize
internal capacitors to store energy. These capacitors are able to discharge large amounts of energy
very rapidly. The rapid discharge of energy is critical to forming the weld nugget. Formation of the
weld nugget occurs during the rst few milliseconds of the welding process. Sunstone’s proprietary
technology allows the energy to be discharged with very high peak currents, as seen in FIGURE 1
below, to produce the best weld nuggets.
This technology is not only designed to increase the energy delivered for weld formation but to
also minimize the heat that is spread to the surrounding material. This ‘heat-affected zone’ around
the weld can suffer from rapid heating and cooling from the weld. But with Sunstone’s proprietary
technology, this zone can be localized to just a small spot around the weld.
FIGURE 1: Sample capacitor discharge curve with high peak current.
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