PRETREATMENT OF FLUX FORE FLUX CORED WIRE AND PRODUCTION OF FLUX CORED WIRE

摘要

PURPOSE:To prevent the unmelting and projecting of a flux and to simultaneously allow the stabilization of flux filling by the higher fluidization of the flux by mixing flux raw materials for the specific period of time per unit amt. thereof or longer in an inert gaseous atmosphere of a specific concn. or above. CONSTITUTION:The flux is highly fluidized by mixing the flux raw materials for =15 minutes per 100kg flux raw materials in the atmosphere of =70% inert gas. The working effect by which the fluidity of the flux is such that the shape of the particles constituting the flux is not always spherical and the fluidity is suppressed each other by the interference of the flux particles with each other. Further, the contact area is larger and the fluidity is inferior as the grain size is smaller. The inert gas, such as Ar, is interposed among the flux particles by sufficiently mixing the particles in the inert gaseous atmosphere. An interference effect is then exhibited and the fluidity is improved. The stabilization of the flux filling is attained in this way and the flux for the flux cored wire with which arcs are extremely stabilized is thus obtd.