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.4450140205

Euro. Trans. Electr. Power

2004

DOI: 10.1002/etep.4450140205

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

Miroslav S. Milićević¹,

Valentina M. Milicevic²

Abstract: This paper deals with the analysis and calculation of characteristic values of the transistor converter of power with energy dosage that can be used for inductive heating and welding. First, the analysis of the current solutions is taken into account, then the disadvantages of certain calculation methods and algorithms are identified, and finally, new theoretical approaches in the calculation of converter parameters are presented. New formulae make it possible for the calculations to be more precise which can … Show more

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Cited by 3 publications

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

Milićević¹,

Radaković

2006

Mater. Trans.

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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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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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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

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

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

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

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