Resistance soldering system

A method of operating a resistance soldering system, comprising:

• receiving an alternating current from a power input channel connected to a power source;
• generating a control signal indicative of a desired power level delivered for a desired time via a controller circuit;
• producing a control voltage proportional to the control signal via a silicon-controlled rectifier electrically connected to the power source and the controller circuit;
• producing an output voltage from a transformer having a primary side and a secondary side as the primary side receives the control voltage from the silicon-controlled rectifier;
• applying the output voltage across a solder joint disposed between output leads electrically connected to the secondary side, wherein electrical resistance of the solder joint to the output voltage melts the solder joint disposed between the pair of output leads;
• and
• determining, via the controller circuit, the control signal applied to the silicon-controlled rectifier required to melt the solder joint based on the desired power level and the desired time, wherein the controller circuit controls the desired time independent of the desired power level.