Potassium Silicate is weighed and added to the dry mixture to obtain a wet mix out of it. This basically acts as a binding agent for the mixture. Now the wet mixture is collected and loaded into a hydraulically operated press, where it is pressed to form briquettes. These briquettes are further loaded in the flux cylinder of the extruder.
Coating the flux by extrusion
The coating of the flux on the metallic rod is done by the extrusion press. Here the flux is fed under pressure through a cylinder and the wire is fed from the wire magazine. During the extrusion process, the metallic wire is fed one by one from the wire feeder and is well coated with the flux by the help of nozzle or die box mechanism well incorporated in the extrusion press. The metallic rods coated with flux are regularly tested in an eccentricity tester to confirm the right formation of the welding rod.
The rods rejected during the test are collected and the flux is stripped off in the stripping rod. These metallic rods can be reused in the process again. The electrodes coming out of the press with the help of conveyor are brushed to make the surface smoother and one end of the welding rod is well ground which is used for holding it by the holder during welding. Then these welding rods are collected in the tray for air drying and after some time they are fed in the oven for proper drying.
Baking of the electrode-