Researh on the Developments of HFIC Allied Powders

Abstract

The following paper presents the constructive manufacturing solution for low and medium allied powders in continuous flux, by melting in the caster, using high frequency induction currents - HFIC, wires, base material, and continuously discarding the melt over a rotating drum, cooled at a determined speed, thus by optimizing the movement and cooling parameters we can obtain the proper grain size.The functional model has the capability to achieve alloyed powders within a broad range of grain size, recommended in research. The melting furnace can be supplied with solid wires or tubular wires, with a fill coefficient of up to 0.55%, which allows the composite core to be integrated into the alloying system. Also, due to its high degree of flexibility, the equipment allows the HFIC melting crucible to be supplied with more than two wires at a time, a feature that ensures a high level of alloying of the powders to be achieved.The functional model developed in order to manufacture powders continuously was used to produce alloyed powders, insensible to elements burns when alloyed, by passing them, at welding, through the electric arc. Forwards we present physical-chemical characteristics of two powders destined to develop composite core from tubular wire alloyed with chromium and nickel.Repairing hot molds by the MIG molds made of low alloyed improvement steel requires type Fe-2.5% Cr-4.5W-V materials, with high homogeneity of the composite mixture from the making of powdered core of tubular wires.Repairing the semi-mechanized rotors made of martensitic steels from hydropower plants requires tubular (cored) wires that deposit type Fe-12% Cr-4% Ni alloys, possibly even Mo.

Lifetime Analysis of Dies Manufactured by Conventional Processes and Reconditioned by Deposition Welding Operation

“…Aspects of reconditioning through welding processes by deposition that are theorized in research are carried out in the field and reported in technical papers [4], which have described applying the research to cutting knives, as well as hammers for the mining industry and automotive parts. Reconditioning knives via welding deposition using modulated and interchangeable elements of a bimetal type, where the layers' depositions are made of special filler materials of a tubular wire type, enhances their reliability; in addition, the costs of manufacturing, exploitation, and maintenance are significantly reduced [5].…”