Welding fixture of rocker arm of turbine casing

The invention provides a welding fixture of a rocker arm of a turbine casing. The welding fixture comprises a bottom plate, a turbine casing fixing mechanism, a bypass valve limiting mechanism and a rocker arm locating plate. The turbine casing fixing mechanism comprises a supporting vertical plate fixed to the bottom plate, a locating seat and a limiting plate. The bypass valve limiting mechanismcomprises a limiting support fixed to the bottom plate and a limiting push rod, and a limiting press head is arranged at the end of the limiting push rod. The turbine casing is fixed to the locatingseat in a sleeve manner through a turbine casing center hole. The limiting plate and the outer side wall of a turbine casing runner opening cooperate to limit rotating of the turbine casing. The limiting push rod is pushed to the work position, and the limiting press head can press a bypass valve. One end of the rocker arm locating plate is fixed to the top of the supporting vertical plate, a locating hole is formed in the