Patent ID: 9700952
Date: 2017-07-11
CPC Classifications: B23K

Claim:
1. An electric spot welding head for a multi-axis industrial robot, comprising: a supporting structure with an end portion for attachment to a robot wrist; a pair of welding electrodes carried by respective electrode-holding arms mounted on the supporting structure, wherein at least one of the electrode-holding arms is movably mounted on the supporting structure between an open position and a closed position, the electrode-holding arms defining a general plane; an actuator positioned parallel to the holding arms for driving the movable electrode-holding arm mounted on the supporting structure; and an electrical transformer for application of an electrical welding voltage to the welding electrodes, the transformer having a housing with a rear wall facing towards the end portion, a front wall opposite to the rear wall, two side walls parallel to the general plane of the electrode-holding arms and two end walls, the transformer further comprising an electrical connector for connection of a power cable of the welding head and two output poles, one of the two output poles arranged on the front wall and the other of the two output poles is arranged on one of the two end walls, wherein the two output poles are electrically connected to the two electrode-holding arms, wherein each of the output poles of the electrical transformer further comprise a cylindrical body defining an integral internal passage for a refrigerant fluid connected to a cooling circuit of the welding electrodes; and wherein the welding head is completely covered by a casing consisting of two lateral half-shells, made of plastic coupled together, having main walls parallel to the general plane of the two electrode-holding arms, the casing having a rear opening for connection of the supporting structure to a flange carried by the robot wrist and a front opening from which the two electrode-holding arms of the welding head protrude.