Due to increasing demand of free maintenance, longer life cycle with free trouble for air pollution control equipment such as FGD and Chimney Liners, the metallic solution is being more popular and more important than before. In metallic solutions, clad plates can offer the most economical and reliable solution, which has the equivalent corrosion resistance and reliability as solid material, and better than
lining. This paper introduces the advantages of clad plate, especially hot roll bonded clad plates based on its manufacturing method, and some data for welding of High-Mo and Ni-Cr-Mo alloy clad plates. Some economical comparison of several materials is also introduced.