Welding apparatus and an operation method thereof.

摘要

When a welding tip (18) is moved from one welding point to a successive welding point, a robot (11) and a welding gun (12) are operated simultaneously with each other during a first time period between an issue of a pressurizing start signal and finish of the pressurizing, and again during a second time period between an issue of a depressurization signal and finish of the depressurization so that a pressurization time period t1 and a depressurization time period t2 are eliminated from a welding cycle time and the welding cycle time is shortened. A welding gun (12) which includes a servo motor (21) and a ball screw (22) for converting a rotation of the servo motor (21) to a stroke of the welding tip (18) is used, and the stroke of the welding tip (18) is counted as one axis of the robot (11), and the welding tip motion is controlled by a robot controller (13). <IMAGE>