Welding gun

Spot welding gun, comprising:

• a support,
• a lower half-gun and an upper half-gun articulated one to the other by a pin, mounted in an oscillating configuration with respect to said support and propping up corresponding welding arms,
• a working cylinder including a body and a stem moving with respect to the body so as to control a reciprocal movement between the upper half-gun and the lower half-gun, and
• a balancing cylinder having a body articulated to the support and a stem articulated to a pin extending on the extensions of the actuating forks;
• the support has a main plate from which extends two parallel support sides with a first articulation axis around which the lower half-gun and the upper half-gun are articulated,
• the lower half-gun comprises two actuating forks to which the body of said working cylinder is articulated around a second articulation axis parallel to the first articulation axis,
• the stem of the working cylinder has an end articulated to the upper half-gun around a third articulation axis parallel to said first articulation axis;
• and
• the actuating forks have extensions extending above the second articulation axis.