Dual metal composite pipe with connecting ring

The utility model provides a dual metal composite pipe with the connecting rings, wherein the connecting rings are arranged on the two ends of the base pipe, a lining pipe is arranged in the base pipe, the base pipe has the same length with the lining pipe does, the outer diameter of the connecting ring is equal to that of the base pipe, the internal diameter is equal to that of the lining pipe, that is the thickness the of the connecting ring is equal to the sum of the base pipe and the lining pipe, the internal end plane of the connecting ring is welded with the external end planes of the base pipe and the lining pipe to form a radial welding ring. The dual metal composite pipe of the structure resolves the problem that the base pipe and the lining pipe are difficult to weld because of the gas and the impurity therebetween when the dual metal composite pipe of the prior art are welded, enhances the weld quality, throughly resolves the problem that the corrosion liquid or gas enters into the space between the lining pipe and the base pipe to corroding the base pipe caused by the weld quality between the lining pipe and the base pipe, prolongs the service life of the dual metal composite pipe, and reduces the production cost. The dual metal composite pipe of the utility model can be used as the conveyer pipe for conveying the corrosion liquid and gas.