Welding equipment for building pipe machining

The utility model discloses welding equipment for building pipe machining. Box body, a sliding groove is formed in the top of an inner cavity of the box body. A bearing plate is slidably connected toan inner cavity of the sliding groove. A limiting block is arranged at the top of the box body; and the bottom of the limiting block penetrates through an inner cavity of the sliding groove and is fixedly connected with the top of a bearing plate, a sliding hole used in cooperation with the limiting block is formed in the top of the box body, bolts are in threaded connection with the two sides ofthe top of the limiting block through threaded holes correspondingly, and pulleys are fixedly connected with the bottoms of the two sides of the bearing plate correspondingly. Through cooperative useof the box body, the sliding groove, the bearing plate, the limiting block, the bolt, the pulley, the telescopic rod, the connecting plate, the power device, the transmission device, the rotating device, the clamping block, the