Method for improving welding performance of nickel-containing low-temperature steel

The invention discloses a method for improving the welding performance of nickel-containing low-temperature steel. The method comprises the processes of electric furnace steelmaking, controlled rolling forming and heat treatment after rolling. In the electric furnace steelmaking process, 15-18 kg of lime is put into each ton of steel at the bottom of the furnace, the temperature of molten steel is 1500-1530 DEG C, the smelting time is not less than 10 min, 3-4 kg of refining slag and 4-5 kg of lime are added into each ton of steel during tapping, and it is ensured that the P content of the steel tapped from the electric furnace is smaller than or equal to 0.004%. A large-lime-content low-temperature smelting process is adopted in the electric furnace smelting process, a certain amount of refining slag and lime are added in tapping, it is ensured that the P content of molten steel is low, and therefore welding defects are reduced; the steel plate is formed by controlled rolling, the rolling reduction is large,