An agglomerated, basic flux specifically designed as a backing flux for one-sided submerged arc welding. The flux creates a perfect root weld with a smooth surface and has a good capability to support the molten weld pool, even at high heat inputs. Since this flux is a backing flux it does not take part in the welding process in a metallurgical way, so no alloying takes place from this flux.
OK Flux 10.69 is mainly used in shipbuilding industries where it is applied to a copper backing bar with a groove that supports the flux on the backside of the weld joint. Welding is done with single-wire, tandem or 3-wire systems. Plates up to approximately 25mm thickness can be welded in one run from a single side.