Tool device for welding expansion valve

The utility model relates to a tool device for welding an expansion valve. The tool device is characterized by comprising a device body, a nitrogen blowing device and a water spraying device, an expansion valve bracket and a connecting pipe bracket are arranged on one side of the top of the device body; a filter bracket is arranged in the middle of the top of the device body; the filter bracket is mounted on the device body through a supporting rod; connecting pipe fixing clamps are respectively arranged on two sides of the filter bracket; the connecting pipe fixing clamp is movably mounted on the device body; a supporting plate is arranged on the side, away from the expansion valve support, of the top of the device body. The supporting plate is installed on the device body through an adjusting mechanism. The water spraying device is arranged above the middle part of the expansion valve bracket; and the nitrogen blowing device is arranged at the front end of the device body through a movable adjusting rod and