Coated Rods for Brazing Structures Used in High Safety Conditions

Binchiciu, Emilia Florina; Fleșer, Traian; Voiculescu, Ionelia; Binchiciu, Aurelia

doi:10.4028/www.scientific.net/amr.1128.224

Cited by 7 publications

(7 citation statements)

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“…The product thus obtained was homogenized with ferrous-manganese from the composition the composite core, the new mixture was used to manufacture and test the experimental group of VTCr25WTi tubular rods. The product recipe of the VIAg40SnR rods, table 2 [1], that deposit two-layer at a single melting, one buffer and one filler, was analyzed in order to observe the involvement of activating precursors in the coat and the diffusion and melt fluidization processes in the coating, we discovered that they have a high mechanical alloying opportunity effect, in order to ensure the compositional homogeneity of the buffer layer. Innovative Technologies for Joining Advanced Materials IX The thus obtained precursor was introduced in the product recipe, homogenized with the deoxidizer system and used to manufacture the experimental lot, that was tested in order to establish the deposits homogeneity.…”

Section: Methodsmentioning

confidence: 99%

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Research on Metallurgic Active Precursors

Binchiciu

Sîrbu

Voiculescu

et al. 2019

AMR

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The paper presents the current state of researches carried out in order to improve homogeneity of mixtures for metallic powders; our priority is those with different participation in the mixture, by mechanical alloying. Mixtures of this type are used in the production of welding and related materials.Recently, research has been done to improve deposited metal properties by welding with coated electrodes, by depositing nanostructures, with uncertain results due to the low degree of homogeneity of blends involved in the electrode coating.The performance enhancement method for coated rods, developed by introducing in their coat activating precursors, used for brazing, is well known. The solution to improve the degree of homogeneity of alloying systems by mechanical alloying has been successfully applied for the manufacture of coated electrodes and those tubular with a composite core which are deposited by manual welding or TIG welding, type Fe25% Cr-4% W-V-Ti-La. The grouping of powder components for mechanical alloying was done in such a way that, finally, we have groups with the granulation, respectively specific weight, close and a low potential of segregation.The method of mechanical alloying of the components was used in the manufacture of coated rods in order to improve the fluidity of silver-rich buffer layers deposited in order to favor the diffusion phenomena of brazing alloys in the base materials.Testing the homogeneity of the alloying systems was performed indirectly by metallographic analysis and sclerometric tests.

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Section: Methodsmentioning

confidence: 99%

“…It is known [1] the performance improving method of brazed coated rods by introducing into them a number of activating precursors. This method is based on the melting condition of the coating, at a lower temperature, with approx.…”

Section: Introductionmentioning

confidence: 99%

Research on Metallurgic Active Precursors

Binchiciu

Sîrbu

Voiculescu

et al. 2019

AMR

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“…In the case of nonconformity of the shape, respectively of the grain size, with technologic specifications of tubular wire manufacturing processes, new products are introduced into mills and grinded in such a manner so it will be appropriate [7].…”

Section: Introductionmentioning

confidence: 99%

Researh on the Developments of HFIC Allied Powders

Binchiciu

Sîrbu

Iovanas

et al. 2019

AMR

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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.

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“…The brazed joint, support-tungsten carbide (WC) reinforcement, is characterized by the chemical-physical proprieties of the addition material and by the manufacturing process of the joints, prescribed by the execution procedure in order to assure constant quality [8][9].…”

Section: Experiments To Qualify the Brazing Processmentioning

confidence: 99%

Factors that influence the quality constant of the manufacturing process for asphalt milling knifes

Iovanas

Binchiciu²,

Voiculescu

et al. 2017

MATEC Web Conf.

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Abstract. The quality constant for mill knifes used to strip asphalt is significantly influenced by the quality of the reinforcement which, in its turn, is influenced by the thermic brazing process and by manufacturing the protection system at blockage through welding when it spins around its axis. It's also influenced by the quality of the intelligent wear and blocking self-protection systems that in their turn are influenced by oxidation and diffusion processes of W and C that make simmered carbides from the reinforcement and brazed joints. Overheating during welding and brazing of the knife reinforcement and/or blockage self-protection reinforcement favours the oxidation of the W carbides leading to a fast degradation of the affected zones, even in exploitation. Exceeding optimum temperature during brazing of the reinforcement in the low chromium alloyed steel support leads to Zn evaporation in certain areas from the brazing material and lowers the brazed joint resistance to wear this causes the knife reinforcement to detach from the support. Taking into consideration the above mentioned facts it is recommended that the production stages of the mill knifes are done mechanized and/or automatic constantly monitoring the execution parameters.

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Coated Rods for Brazing Structures Used in High Safety Conditions

Cited by 7 publications

References 0 publications

Research on Metallurgic Active Precursors

Research on Metallurgic Active Precursors

Researh on the Developments of HFIC Allied Powders

Factors that influence the quality constant of the manufacturing process for asphalt milling knifes

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