Butt welding connecting method of laminar composite plate coated with LC2205 stainless steel up and down

The invention discloses a butt welding connecting method of a laminar composite plate coated with LC2205 stainless steel up and down. Two layers of LC2205 stainless steel and one layer of carbon steel are connected through a hot rolling process, and are rolled to the laminar composite plate by a controlled-rolling and controlled-cooling technology; the upper and lower two layers are LC2205 stainless steel alloy layers; the middle layer is a carbon steel layer; based on finish design and machining of a V+I+V special groove, the welding is performed by a sequence of the carbon steel layer, a transition layer and the LC2205 stainless steel layers, and the cladding thickness of the transition layer is controlled, so that the transition layer material achieves a transition compensation effect on corrosion resisting metal Cr and Ni, the excellent corrosion resistance of the upper and lower LC2205 stainless steel layers is guaranteed, and a welding line area is reliable in welding quality and excellent in comprehens