welding rotators can be divided into self-adjusting and adjustable roller frame. It can be applied to products with different diameters in the specified range, and can achieve step less speed regulation under the specified welding parameters, with low transmission noise and stable working rotation. Among them, polyurethane rollers can be used together, and polyurethane is a new organic polymer material. It has good oil resistance, toughness, wear resistance and aging resistance. The tensile strength, tear strength, wear resistance and other properties are 3-5 times higher than that of ordinary rubber. The use of polyurethane wheel can no longer be aided by metal. It is especially suitable for the welding of the production line of the wind tower and the stainless steel tube.