Small mechanical arm welding head

The utility model relates to a small mechanical arm welding head which comprises a welding head installation frame, a welding head body is installed at the bottom of the welding head installation frame, a side support is fixed to the welding head installation frame, a damping box is fixed to the side support, the damping box comprises a shell, and a plurality of supporting piece frames are arranged in the shell. A supporting piece is arranged on the side, away from the shell, of the supporting piece frame, a spring is connected between the shell and the supporting piece, a rotating shaft and agrinding wheel are arranged in the damping box, the rotating shaft is sleeved with the grinding wheel, a grinding piece is arranged between the grinding wheel and the supporting piece, and the two ends of the rotating shaft penetrate through the interior of the shell. An angle adjusting rod is fixed to the end of the rotating shaft, and a welding wire conveying pipe is installed on the rotating shaft. According to the sm