The PP round square extrusion automatic welding machine can achieve welding of plastic products inside and outside, replacing manual welding. With the rotation of the disc, it can weld plastic barrels of different diameters, with beautiful welds, no burrs, and strong and firm welds. Application scope: Manufacturing PP and PE water tanks and containers, aquaculture ponds, environmental protection technology, swimming pools, PP spray towers, desulfurization towers, electroplating equipment, PP and PPH winding storage tanks and other equipment.