The utility model belongs to the technical field of oil and gas gathering, transferring, storing and transporting, and discloses a welded short piece for a carbon steel carbon steel pipeline or a stainless steel pipeline or a bimetal composite pipeline. A stainless steel lining pipe is arranged on the lining of the inner cavity of one end of a base pipe, the ratio of the second length to the first total length of the stainless steel lining pipe is from 1 to 5 to 4 to 5. An insulating lining layer is arranged in the inner cavity of the middle of the base pipe and covers the stainless steel lining pipe and the inner cavity of the base pipe, and the ratio of the third length to the first total length of the insulating lining layer is from 1 to 10 to 3 to 4. The welded short piece has the advantages that the insulating lining layer is used for isolating a water film electronic channel between carbon steel and stainless steel, and therefore galvanic corrosion of the contact area of the carbon steel and the stainless steel is reduced, the galvanic corrosion problem caused after welding of the carbon steel pipeline or the stainless steel pipeline or the bimetal composite pipeline can be effectively, and the service life of the pipeline is prolonged.