Self-adjustable welded rolle carier can adjust the angle of its swing arm to fit for the changes in workplece diameler.Under the mode of dual-motor driven,the rolle is divided into three types of ruber roller,stel wheel and rubber-steel whel;as for the control system,there are simulation or digital control types to be selected,and linkage control with other equipment is allowed.As a resut,the product is widely used in wind power,pressure vessel,petrochernistry,pipeline,boiler,welding repair and other industries.