Spot welding apparatus

A spot welding apparatus comprising:

• a first welding electrode;
• a pressing force actuator for causing a second welding electrode facing the first welding electrode to move between a pressing force applying position, where the second welding electrode holds a workpiece together with the first welding electrode such that the first welding electrode and the second welding electrode apply pressing forces to the workpiece, and a retracted position away from the workpiece;
• a control pressing force applying actuator for causing a control pressing force applying unit to move between a control pressing force applying position, where the control pressing force applying unit is located adjacent to the first welding electrode or the second welding electrode and comes into contact with the workpiece so as to apply a control pressing force to the workpiece, and a retracted position away from the workpiece;
• a welding transformer serving as a power source to apply a current between the first welding electrode and the second welding electrode;
• and
• a support bracket supported by a welding robot;
• wherein the pressing force actuator is arranged at a front side of the support bracket, while the control pressing force applying actuator and the welding transformer are linearly arranged at a rear side of the pressing force actuator.