Welded steel is the same or different diameters of the vertical and horizontal steel bars were arranged vertically in a certain pitch, all crossing points are formed together with the resistance spot welding of steel mesh. Is directly welded in the factory steel mesh molded products to replace the hand-stretched steel bar, is a new, high efficiency, energy saving, construction material, reinforced concrete structure. Reinforced by steel bars welded into a different type of hot-rolled (I, II, III) welded steel, cold drawn steel bars welded smooth muscle network, cold-rolled ribbed steel bars welded.