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Capacitive Discharge (CD) welders, also known as stored energy welding power supplies, extract energy from the power line over a period of time and store it in welding capacitors. Because energy is stored before each weld, effective weld output is independent of line voltage fluctuations, providing consistent energy delivery.
During the welding cycle, the stored energy is rapidly discharged through a pulse transformer, generating electrical current that flows through the weld head and workpieces to form the weld.
CD welders accumulate electrical energy in a capacitor bank and release it in a short, high-power pulse. This discharge creates the welding current required for material fusion.
Stored energy is expressed in watt-seconds (joules) and is calculated as one-half the capacitance multiplied by the square of the applied voltage. Due to losses in the primary and secondary circuits, the energy delivered to the electrodes is lower than the total stored value.
AMADA WELD TECH capacitive discharge power supplies offer a Dual Pulse feature, allowing two sequential energy pulses during a weld cycle:
This dual-pulse process improves weld consistency and reduces spitting during welding.
Capacitive discharge welders provide several advantages in resistance welding applications:
These characteristics make CD welders well suited for applications such as battery manufacturing and welding of conductive materials.
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