Mold for grounding grid welding and welding method

The invention discloses a mold for grounding grid welding and a welding method. The mold for grounding grid welding comprises a bottom plate, wherein a support is welded to the top of the bottom plate, a supporting plate is connected to the top of the support, a heat release welding flux storage hopper is installed on the upper end face of the supporting plate, a connecting plate is connected to the side wall of the support in a limiting and sliding mode in the vertical direction, an upper mold is fixedly connected to one side of the connecting plate, a reaction cavity and a first drainage channel are formed in the upper mold from top to bottom, the reaction cavity communicates with a heat release welding flux storage hopper, the bottom of the upper mold is rotatably connected with a rotating disc which is arranged in an inclined state, and a linear mold, a T-shaped mold and a cross-shaped mold are distributed on the lower end face of the rotating disc; the linear mold, the T-shaped mold and the cross-shaped