CAPACITIVE DISCHARGE WELDING (CD)

Stored energy welding

Capacitor Discharge DC is one of the direct current series which extracts energy from the power over a period of time for storing in capacitors. The stored energy is rapidly discharged to transformer producing a flow of electrical current for welding. Capacitor Discharge solution is the best application in welding products in hot rolled sheet or thick steel sheet with multiple embossments.

The stored energy welding power supply, commonly called a Capacitive Discharge or CD Welder, extracts energy from the power line over a period of time and stores it in welding capacitors. Thus, the effective weld energy is independent of line voltage fluctuations. This stored energy is rapidly discharged through a pulse transformer producing a flow of electrical current through the welding head and workpieces. Capacitive discharge power supplies are rated in accordance with the amount of energy they store and the welding speed. The energy stored, expressed in watt-seconds (joules), is the product of one-half the capacitance of the capacitor bank and the square of the applied voltage. The energy delivered to the electrodes is considerably less than this value because of losses in the primary and secondary circuits. Some power supplies provide a “Dual Pulse” feature which allows the use of two pulses to make a weld. The first pulse is generally used to displace surface oxides and plating, and the second pulse welds the base materials. This feature also reduces spitting.

Discharged Current Welding

Capacity Discharged welding

High speed charging and discharging

  1. High speed of charging and discharging digital stable voltage circuit. The times of charging could reach 124 times per minute. (See graph)
  2. Quick logic circuit which does ensure the machine to work only when the voltage of discharging has reached the preset data. Under such situation, when the machine is conducting high ritme work, it will not discharge when the voltage does not reach preset data and will not influent the welding effect.
  3. Digital adjustable stored energy voltage which could be adjusted from 0 to 425V. Accuracy could reach ±1V.
  4. Accurate digital circuit which could control the error rate of stable voltage to be ±0.5%.
  5. Double over pressure protective circuit which could ensure the charging voltage will not exceed the preset safety standard so as to protect the capacitor.
  6. Built-in and preset safe discharging time is 0.1s.
  7. LCD counters.
  8. Easy digital button control panel