Automatic circular arc welding machine

The utility model relates to the technical field of welding equipment, in particular to an automatic circular arc welding machine. The automatic circular arc welding machine structurally comprises a machine base, a positioning assembly used for storing and positioning workpieces, a cylinder driving device, a rotating device connected with the cylinder driving device and a welding device. The machine base is provided with a cantilever. The cylinder driving device is fixed on the cantilever and used for driving the rotating device to move up and down in the vertical direction. The welding device comprises a welding gun and a welding gun clamp mounted on the rotating device. The rotating device drives the welding gun clamp to make horizontal circular motion. The welding gun clamp comprises a transverse bar which is horizontally arranged on the rotating device, a longitudinal bar which is vertically arranged on the transverse bar and a mounting bar which is arranged on the longitudinal bar. The longitudinal bar can make transverse movement along the transverse bar so as to adjust the position of the longitudinal bar on the transverse bar, the mounting bar can make longitudinal movement along the longitudinal bar so as to adjust the position of the mounting bar on the longitudinal bar, and the welding gun is mounted on the mounting bar in an angle adjustable mode. The automatic circular arc welding machine is high in degree of automation, high in welding efficiency, good in welding quality and capable of effectively saving cost.