WELDING ROBOT MECHANISM

Provided is a welding robot mechanism that has: a welding robot having a touch sensing function; a welding power source for supplying welding power to the welding robot; and a control unit for controlling the welding robot, wherein the welding power source has a welding power source communication unit that receives detection signals with regard to control of the welding robot and the touch sensing, and transmits the detection signals outward. The control unit is linked to the welding power source communication unit via a serial bus communication wire. The detection signals comprise a mass of data including a detection data group designated as a first group and a detection data group designated as a second group, and is configured to read the detection data group designated as the first group in a shorter cycle than that for the detection data group designated as the second group. The detection data group designated as the first group includes a detection signal obtained by the touch sensing.