Arc welding device and welding method

The invention relates to the technical field of welding, and particularly discloses an electric arc welding device and a welding method.The electric arc welding device comprises a moving shaft, a welding gun head, a rotary encoder, a first position sensor, a wire feeding device, an actuator and a second position sensor; the rotary encoder is used for measuring the actual rotation angle of the welding gun head during welding along the welding path; the first position sensor is used for measuring the actual position of the welding gun head; a wire feeding nozzle of the wire feeding device is used for conveying a welding wire to the welding gun head; the actuator is used for driving the wire feeding device to rotate according to the correction angle; the second position sensor is used for measuring the actual position of the actuator. The correction angle is obtained according to the actual rotation angle information, the actual position information of the welding gun head and the actual position information of