welding linning to ensure that joint root pass through the back forming and welding, on the back of the joint preset a foil device.
    the ceramic cushion material factor of porosity is low, waterproof moisture resistant ability strong, has satisfies the welding request the removability of slag and the physical property, regardless or stands in the flat welding welds the position, its welded joint forming even smooth, presses the pit without the gas, may guarantee the welded joint forming quality.
thickness allowable deviation-----cbt3715-95