Analysis of the transistor converter of power together with energy dosage for the inductive heating and welding of steel tubes

Milićević, Miroslav S.; Milicevic, Valentina M.

doi:10.1002/etep.10

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…If this is above 0.35%, it confirms the presence of brittle structure, which makes such a product in appropriate for most structural applications. Analysis of the experimental results in [25][26][27][28][29][30][31][32][33][34] shall be used. Table 1 depicts the results obtained in regular welding of steel pipe with a diameter of 26 mm, where the ferrite TDK-IP1 is used for the impeder.…”

Section: Instrumentation Used Analysis and Discussionmentioning

confidence: 99%

Implementation of optimal HF welding procedure of steel pipes for high-quality and energy-efficient welds

MILIĆEVIĆ,

NEJKOVIĆ

2024

Proc. Rom. Acad. Ser. A - Math. Phys. Tech. Sci. Inf. Sci.

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Electric currents of medium and high frequencies are used for inductive heating and welding of steel products. Furthermore, magnetic concentrators are used for the optimisation of transfer so that they direct the currents at a specific area of the heat-treated steel product. After years of study and detailed experimental research, we have found out that the material behaviour during inductive heat treatment also depends on the type of concentrator applied. The character of the electric current passing through the steel products changes through the application of different concentrators which directly alter the structure and quality of the final product. Ferritic and magneto-dielectric concentrators from different producers have been used in the research with HF inductive welding of steel pipes.

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Section: Instrumentation Used Analysis and Discussionmentioning

confidence: 99%

Implementation of optimal HF welding procedure of steel pipes for high-quality and energy-efficient welds

MILIĆEVIĆ,

NEJKOVIĆ

2024

Proc. Rom. Acad. Ser. A - Math. Phys. Tech. Sci. Inf. Sci.

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“…Pošto su se dosadašnje formule za proračun bitnih komponenti termičkih procesa pokazale grubim u smislu tačnosti i rešivosti, autor je korišćenjem brojne i izabrane literature iz matematike i numeričke analize [25][26][27][28][29][30][31][32][33][34] izveo proste analitičke izraze za temperaturu predgrevanja koji će biti od velike koristi istraživačima i tehnolozima koji se bave tehnologijom zavarivanja. Inventivnim rezultatima su doprineli rezultati koje je postigao autor ovog rada učestvujući u publikovanju radova [35][36][37][38][39][40] sa koautorima ili samostalnim istraživanjima. Korisno su poslužili i izlaganje i rezultati radova [41][42] koji su publikovani u renomiranom časopisu iz oblasti zavarivanja gde su dati teoretski i praktični rezultati.…”

Section: Uvodunclassified

“…A kasnije se primenju gotovi kupljeni softverski paketi za simulaciju i izračunavanje kako bi se stvorio privid primene postojeće teorije. Autor ovog rada je sa koautorima i sam u brojnim svojim radovima [35][36][37][38][39][40] ukazivao na to nudeći nove i veoma precizne zavisnosti i postuke za izračunavanje. Budući da je za rešavanje transcedentnih jednačina autor koristio iterativne metode koje su davale precizne rezultate karakterističnih veličina i to kritičnog vremena hlađenja i temperature predgrevanja [40] gotovo istih kao što to daje FEM metoda.…”

Section: Zaključakunclassified

Contribution to new calculations of preheating and differentiation temperatures using Lagrange interpolation

Milićević¹

2020

Zavariv zavar konstrukcije

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This paper presents a chronology of how the critical cooling time and preheating temperature in welding have been determined so far. The author of this paper introduces a new approach in calculating preheating temperature using prior art experience as well as his long-term research results in the field of welding. Earlier solutions were based on Rosenthal's 2D and 3D model for calculating the critical cooling time and the corresponding preheating temperature and the improved expressions used by the British Standard. This paper uses the necessary experience in thermal and the corresponding disciplines of mathematics. Problems that occur and prevent efficient obtaining of solvable expressions in a simple and elementary way, the author of this paper solves it in a completely new and inventive way.

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“…The contributions in design of both transistor converters, through an analytical method for calculating the characteristic parameters of inverters, are exposed in the Ref. 6).…”

Section: Introductionmentioning

confidence: 99%

Quality Improvement of Steel Pipes Produced by Seam Welding with New Magneto-Dielectric Impeder

Milićević¹,

Radaković

2006

Mater. Trans.

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The standard technology of steel pipe production is the high frequency (HF) inductive welding. A mechanically formed profile is introduced into an inductor. Inside the pipe, in the position of the inductor there is an impeder, whose function is to form a suitable distribution of the electromagnetic and temperature field. In previous paper of the authors, the new magneto-dielectric (MD) material for the impeder is proposed and results of extraordinary energy saving are shown.This paper treats the aspect of the pipe quality, which represent the essential parameter in a production technology. The analyses were made for the widely spread ferrite impeder and for the proposed MD impeder. From this point of view, the MD impeder appeared to be advantageous material also. In addition to the standard mechanical tests of pipes quality, extensive chemical and physical analyses of the material in the weld, as well as in the basic section of the pipe, have been performed. The aim of the investigation was to explain the bad results in the standard flattening and hydrostatic testing of pipes produced using the ferrite impeder of TDK-IP1 type.

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Analysis of the transistor converter of power together with energy dosage for the inductive heating and welding of steel tubes

Cited by 3 publications

References 1 publication

Implementation of optimal HF welding procedure of steel pipes for high-quality and energy-efficient welds

Implementation of optimal HF welding procedure of steel pipes for high-quality and energy-efficient welds

Contribution to new calculations of preheating and differentiation temperatures using Lagrange interpolation

Quality Improvement of Steel Pipes Produced by Seam Welding with New Magneto-Dielectric Impeder

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