Taking the on-site assembly and welding of the steel containment vessel of a nuclear power plant as an example

this paper introduces the composition of the steel containment vessel of a nuclear power plant

the welding characteristics of SA738Gr.B material

difficulties in the construction process

welding process

common methods for controlling welding deformation

etc. Combining with the characteristics of the structure of the steel containment vessel

the reasons of welding deformation during assembling and welding of steel containment vessel are analyzed. Taking the assembling and welding of bottom head of steel containment vessel as an example

the measures for controlling the welding deformation of the bottom head are described from the groove design

the gap of the groove group

the amount of misalignment

the tack welding and the welding process and so on

the practical results show that the proposed measures of welding deformation is feasible. It provides a reference for the welding deformation control of steel containment in nuclear power plant.