Distribution and reduction in P concentration of submerged arc welding slag

Abstract

Submerged arc welding (SAW) is widely used in the fields such as ship buildings and steel pipe production. Recently reuse of SAW slag as a raw material of SAW flux has been discussed, as a measure to reduce costs and to conserve natural resources. The present study investigated distribution of P in the slag and its major origin (i.e., welding wire or base metal plate). It also proposed slag remelting as a method of P concentration reduction of the slag. It was recognized that P was mainly distributed in the matrix and metallic steel particles with only larger diameters. It was also identified that the base metal plate was the main source of P in the slag. Remelting of the slag was proved as a promising method for P concentration reduction of the slag.

Surface ionic coordination of Al2O3–CaO–based molten slag induced by structural relaxation

“…For example, the Marangoni flow of slag, which is driven by local changes in the surface tension is the main cause of local dissolution loss of refractory materials. 1,2 Slag-forming behavior in refining processes 3 and the shapes of weld beads 4 are strongly affected by the surface tension of the molten slag. Control of these phenomena is important because they significantly affect the produced amounts and qualities of materials, and the maintenance costs of refractory materials.…”