Method for welding helical blade to circular inner cylinder wall

The invention relates to a method for welding a helical blade to a circular inner cylinder wall. The method comprises the following operation steps that the helical blade is fixedly clamped to a bladeclamping device according to the standards of a preset helical line; the helical blade with the position well fixedly adjusted is fed into a preset installation position in an inner cavity of a steelcylinder with the position well adjusted on a steel cylinder fixing device; preliminary welding is conducted between the helical blade and the steel cylinder in a spot welding way; the blade clampingdevice is separated from the helical blade, and the blade clamping device is pulled out of the steel cylinder; the helical blade and the steel cylinder are reliably welded in a helical welding way. Through the scheme, it can be effectively achieved that the helical blades of different sizes are reliably clamped; the corresponding welding requirements are met; and the reliable welding between thehelical blade and the steel