Control system of a C-type welding gun

A welding gun configured to be positioned against a workpiece by a robotic arm, said welding gun including:

• a housing configured for attachment to the robotic arm;
• a curved arm attached to said housing, said curved arm having an end spaced from said housing and having an electrode at said end directed toward said housing;
• a movable arm attached to said housing, said movable arm having an electrode attached thereto, said movable arm electrode being directed toward said curved arm electrode;
• a first servomotor attached to said housing, said first servomotor having a drive mechanism for reciprocally moving said movable arm towards said curved arm electrode;
• a second servomotor attached to said housing, said second servomotor having a drive mechanism for reciprocally moving said housing and said curved arm relative to the robotic arm;
• a signal generator for selectively generating a signal when said curved arm electrode contacts the workpiece;
• and
• a controller configured to receive said signal produced by said signal generator, to simultaneously actuate said first and second servomotors so that said electrodes simultaneously approach the workpiece and to stop said actuation of said second servomotor in response to receipt of said signal from said signal generator.