The weld joints between the channel clapboard and shell of a disposal vaporizer generate welding deformation.The maximum concave may reach 5 mm,so it may have a bad influence on the safe operation of the structure.The inherent strain method was applied to calculate the strain volume of the channel clapboard and shell,and then get the welding residual stress of the shell.On this basis,three cases of stresses,which is the welding residual stress,design stress and welding residual stress plus design stress,calculate the equivalent strain of the deformation zone,transform it into equivalent residual stress,and then perform strength analysis by using finite element method.The result can be used to guide the actual operation of the vaporizer.