Automatic rotary welding device

The utility model discloses an automatic rotary welding device. The automatic rotary welding device comprises a welding trolley, a connecting rod sleeve, a connecting rod, a rotary shaft, an insulating clamp base, a centering disc and an annular bottom plate, wherein the welding trolley is provided with driving wheels and a universal trundle, the centering disc is located at the center of the annular bottom plate, the rotary shaft is fixedly connected with the center of the centering disc through threads, and the insulating clamp base is installed on the outer circumferential surface of the rotary shaft through bolts. Thus, the connecting rod sleeve is installed on the welding trolley, one end of the connecting rod is connected with the insulating clamp base, the other end of the connecting rod is connected with the connecting rod sleeve, and the whole welding trolley is placed on the annular bottom plate. An existing submerged arc welding machine can be used for welding circumferential welds of large workpieces, automatic welding of circumferential welds is achieved, the design purpose is achieved through actual use of products, welding quality and efficiency are effectively improved, and labor intensity is relieved.