Sharp Tools offers Metal Arc Manual Welding Electrodes. Sharp Tools is an ISO 9001: 2000 certified company. The Metal Arc Manual Welding Electrodes is used for welding and repairing all cast iron components because of easy and intimate fusion with all grade of cast iron the electrode. The other applications of Metal Arc Manual Welding Electrodes include repair of broken castings, building up of worn surfaces or correcting machining errors on castings and joining cast iron to steel.