Method for welding CV barrel and penetrating part sleeve of AP1000 nuclear power station

The invention relates to the field of nuclear power building, in particular to a method for welding a steel safety shell barrel and a penetrating part sleeve mounted on the barrel in an AP1000 nuclear power station, and provides a method for welding a CV barrel and a penetrating part sleeve of an AP1000 nuclear power station to improve the welding efficiency and reducing the defect generation probability on the premise of guaranteeing welding quality. The penetrating part sleeve is hoisted and temporarily fixed into a mounting hole in the CV barrel; bottoming welding is carried out in an inner side groove and an outer side groove of the CV barrel through an argon tungsten-arc welding method; and the azimuth angle of the penetrating part sleeve is measured and calculated, when the deviation alpha of the azimuth angle is larger than 2 degrees, the azimuth angle is adjusted till the deviation alpha of the azimuth angle is smaller than or equal to 2 degrees, and filling welding and cover face welding are alternat