Project Introduction: The structure type is large section welded H beam lattice column and H beam rafter. The column is about 3.5~4.6m wide, about 30~35 m high, and the weight of one column is about 20~38 tons. The fabricated members had the characteristic of large section area, high tonnage and high assembly precision standard. During the process, every department must cooperate with each other well to proceed cutting, assembly, weld and paint. It requested production line had fast turnover speed and meantime the capacity of quickly finishing reversing high tonnage member.