Start using the welding steel structure industry ceramic liner from qing root process has certain advantage in environmental protection:4, environmentalTraditional carbon arc air gouging opposite root process, because of the need to use the carbon arc air gouging for weld reverse side root operation, will produce a lot of smoke and dust pollution environment, also will produce a great deal of noise in the process of operation and the arc, incidental cause noise pollution and light pollution.While the ceramic liner from the root process, to eliminate the carbon arc air gouging root process, smoke, arc and the noise pollution problem solved, can make the steel structure processing workshops operate within the micro environment improved significantly.The new welding technology in welding seam inner quality, appearance quality, cost, environmental protection has great advantage.Ceramic liner from the root process, has in promoting green building steel structure manufacture industry and application value. V