1. A single pass welding process for thick materials in a vertical or close to a vertical position.

An electric arc is initially struck by a wire which is fed into a weld location and then flux is added.

Additional flux is added until the molten slag, reaching the tip of the electrode, extinguishes the arc.

2. A welding process in which consumable electrodes are fed into a joint containing flux.

The electric current melts the flux, and the flux in turn melts the faces of the joint and the electrodes, allowing the weld metal to form a continuously ingot cast between the joint faces.

3. Having to do with a method of welding or refining metals by passing an electric current through molten metal and a layer of slag in which impurities are dissolved.