A resistance soldering system, comprising: a power input configured to receive an alternating current from a power source; an AC-DC converter in electrical communication with the power input and configured to convert the alternating current to a direct current at a converter output; being further characterised by: a controller circuit configured to generate a control signal indicative of a desired power level delivered for a desired time, wherein the control signal is a voltage signal or a current signal; a silicon-controlled rectifier electrically connected to the power input and the controller circuit and configured to output a control voltage proportional to the control signal through an SCR output channel; a transformer having a primary side and a secondary side, the primary side in electrical communication with the SCR output channel, the transformer reducing the control voltage from the primary side to a secondary voltage on the secondary side; and a pair of output-leads in electrical communication with poles of the secondary side of the transformer, the pair of output leads configured to apply the secondary voltage to a solder joint disposed between the pair of output leads, wherein the controller circuit determines 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 and wherein the controller circuit controls the desired power level independent of the desired time and controls the desired time independent of the desired power level. a power input configured to receive an alternating current from a power source; an AC-DC converter in electrical communication with the power input and configured to convert the alternating current to a direct current at a converter output; being further characterised by: a controller circuit configured to generate a control signal indicative of a desired power level delivered for a desired time, wherein the control signal is a voltage signal or a current signal; a silicon-controlled rectifier electrically connected to the power input and the controller circuit and configured to output a control voltage proportional to the control signal through an SCR output channel; a transformer having a primary side and a secondary side, the primary side in electrical communication with the SCR output channel, the transformer reducing the control voltage from the primary side to a secondary voltage on the secondary side; and a pair of output-leads in electrical communication with poles of the secondary side of the transformer, the pair of output leads configured to apply the secondary voltage to a solder joint disposed between the pair of output leads, wherein the controller circuit determines 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 and wherein the controller circuit controls the desired power level independent of the desired time and controls the desired time independent of the desired power level. a controller circuit configured to generate a control signal indicative of a desired power level delivered for a desired time, wherein the control signal is a voltage signal or a current signal; a silicon-controlled rectifier electrically connected to the power input and the controller circuit and configured to output a control voltage proportional to the control signal through an SCR output channel; a transformer having a primary side and a secondary side, the primary side in electrical communication with the SCR output channel, the transformer reducing the control voltage from the primary side to a secondary voltage on the secondary side; and a pair of output-leads in electrical communication with poles of the secondary side of the transformer, the pair of output leads configured to apply the secondary voltage to a solder joint disposed between the pair of output leads, wherein the controller circuit determines 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 and wherein the controller circuit controls the desired power level independent of the desired time and controls the desired time independent of the desired power level.