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The Analysis of Thermomechanical States in Multipass Arc Weld Surfaced Steel Elements

Winczek J.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 4

1615--1628

EN

The paper presents the analysis of temperature fields, phase transformations, strains and stresses in a cuboidal element made from S235 steel, surfaced with multipass GMA (Gas Metal Arc) method. The temperature field is described assuming a dual-distribution heat source model and summing up the temperature fields induced by the padded weld and by the electric arc. Dependence of stresses on strains is assumed on the basis of tensile curves of particular structures, taking into account the influence of temperature. The calculations were carried out on the example of five welds in the middle of the plate made of S235 steel. The simulation results are illustrated in graphs of thermal cycles, volume shares of structural components and stresses at the selected points of cross-section, and the temperature and strain distributions in the whole cross section.

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Thermomechanical States in Arc Weld Surfaced Steel Elements

Winczek J., Skrzypczak T.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 3

1623--1634

EN

Kinetics of phase transformations during heating is limited by temperature values at the beginning and at the end of austenitic transformation, while the progress of phase transformations during cooling is determined on the basis of TTT-welding diagram and Johnson-Mehl-Avrami and Kolomogorov law for diffusive transformations and Koistinen-Marburger for martensitic transformation. Stress state of a bar subjected to thermo-mechanical loads is described assuming the plane cross section hypothesis and using integral equations of stress equilibrium of a bar as well as simple Hook’s law. Stresses in the elastic-plastic state are determined by iteration using solutions with a variable elastic modulus of elasticity, conditioned by tensile curves. Dependence of stresses on strains is assumed on the basis of tensile curves of particular structures, taking into account the influence of temperature. There were performed calculations of the temperature field, phase transformations, strains and stresses for GMAW surfacing of a cuboid element made of S235 steel. Authors’ programs, made in Borland Delphi, were used for calculations.

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The model of temporary temperature field during multi-pass arc weld surfacing. Pt. 1, Analitycal description

Winczek J., Rygał G., Skrzypczak T.

Journal of Applied Mathematics and Computational Mechanics

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2015

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Vol. 14, nr 2

123--130

EN

This work presents a model of a temperature field in a steel element during multi-pass Gas Metal Arc Weld surfacing taking into account heat of the melted electrode material. An analytical solution for a half-infinite body model is obtained by aggregating temperature increments caused by applying liquid metal and heat radiation of a moving electrode. The assumptions are Gaussian distributed heat sources of applied melted electrode material and of an electric arc.

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The model of a temporary temperature field during multi-pass arc weld surfacing. Pt. 2, Example of computations

Winczek J., Rygał G., Skrzypczak T.

Journal of Applied Mathematics and Computational Mechanics

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2015

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Vol. 14, nr 3

141--148

EN

In this work computations of a temperature field are carried out during multipass Gas Metal Arc Weld surfacing of a cuboidal steel element taking into account heat of the melted electrode material. The results are presented in the form of temporary and maximum temperature distribution in the element’s cross-section and thermal cycles at selected points.