Physical Mechanisms and Mathematical Models of Bead Defects Formation During Arc Welding

Sudnik, W. A.

doi:10.5772/30803

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…Arc welding is commonly used to join constructional steel in building, offshore structures, and bridges [1]. Residual stress (RS) is unavoidably generated in the weldment because of heterogeneous plastic deformation induced by arc heat input [2,3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Restraint Conditions on Welding Residual Stresses in H-Type Cracking Test Specimens

et al. 2019

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From the viewpoint of mechanics, weld cracking tends to occur if the induced tensile stress surpasses a certain value for the particular materials and the welding processes. Welding residual stresses (WRS) can be profoundly affected by the restraint conditions of the welded structures. For estimating the tendency of weld cracking, the small-scale H-type slit joints have been widely used for cracking tests. However, it is still hard to decide whether the real large-scale component can also be welded without cracking even though the tested weld cracking specimens on the laboratory scale can be welded without cracking. In this study, the intensity of restraint which quantitatively indicates how much a joint is restrained is used. The influence of restraint condition (intensity of restraint) on WRS is systematically investigated using both the numerical simulation and the experimental method. The achievement obtained in the current work is very beneficial to design effective H-type self-restrained cracking test specimens for evaluating the sensitivity of the material and the welding procedures for weld cracking in the real large-scale components.

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Section: Introductionmentioning

confidence: 99%

Influence of Restraint Conditions on Welding Residual Stresses in H-Type Cracking Test Specimens

et al. 2019

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“…3 is introduced and the following nonlinear heat diffusion equation is considered, describing the spatiotemporal variations of the temperature in the welded workpiece [2][3][4] …”

Section: Dynamic Model Of the Arc Welding Processmentioning

confidence: 99%

“…According to welding theory, the temperature of the heat affected zone determines the quality of the weld [2][3][4][5][6]. The heat-affected zone is defined as the area round the weld bead where the temperature of the melted material varies between a lower and upper limit, where each limit is associated with transition to a different phase and structure of the material.…”

mentioning

confidence: 99%

Control of Heat Diffusion in Arc Welding Using Differential Flatness Theory and Nonlinear Kalman Filtering

Rigatos

Siano

2016

Intell Ind Syst

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Control of the heat diffusion in the welded metal is of primary importance for successful welding of high quality (the latter being a prerequisite for efficient ship building). The paper proposes a distributed parameter systems control method that is based on differential flatness theory, aiming at solving the problem of heat distribution control in the arcwelding process. Besides it proposes a nonlinear filtering method, under the name Derivative-free nonlinear Kalman Filtering for reducing the number of real-time control measurements needed to implement the feedback control loop. The stability of the control method is confirmed analytically, while its efficiency is also evaluated through simulation experiments.

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“…на условия выполнения сварки больше, чем на какой-либо другой технологический процесс обработки металлов, влияют размеры и форма заготовок, качество и точность сборки, а также изменение в процессе работы размеров деталей вследствие тепловых деформаций. поэтому к оборудованию, которое используется для организации сварочных работ, предъявляются многочисленные требования и уделяется огромное внимание [1][2][3][4].…”

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“…поскольку зна-чительное время расходуется на вспомогательные, сборочные и дополнительные работы, что снижает эффективность применения современных высокопроизводительных способов сварки, сокращение цикла производства и высокое качество сварных швов могут быть достигнуты только при комплексной механизации и автоматизации сварочных, сборочных и вспомогательных операций. Уровень комплексной механизации обусловливает наличие в составе установки технологических приспособлений, механического, вспомогательного и другого оборудования (транспортного, контрольного и тому подобного) [1][2][3][4][5].…”

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Automation of welding processes with use of mechanical welding equipment

Lendel¹,

Лебедев²,

Maksimov³

et al. 2017

Avtom. svarka (Kiev)

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в статье приведены примеры роботизации, автоматизации и механизации сварочных и родственных процессов на базе механического сварочного оборудования (мсо). в состав комплексов и установок, применяемых для процессов сварки или наплавки, входят как серийные образцы мсо, так и специально созданные, учитывающие индивидуальность конструкции изделия и технологические особенности его изготовления. показано широту решаемых задач и возможность отечественного производителя мсо осуществлять разработку и создавать современные высокотехнологические комплексы и установки для сварки и наплавки. отмечена возможность разработки специального мсо для новых технологий сварки и наплавки в составе роботизированных комплексов и автоматических установок. Библиогр. 9, рис. 5. К л ю ч е в ы е с л о в а : дуговая сварка, наплавка, механическое сварочное оборудование, автоматизация, механизация.

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Physical Mechanisms and Mathematical Models of Bead Defects Formation During Arc Welding

Cited by 4 publications

References 12 publications

Influence of Restraint Conditions on Welding Residual Stresses in H-Type Cracking Test Specimens

Influence of Restraint Conditions on Welding Residual Stresses in H-Type Cracking Test Specimens

Control of Heat Diffusion in Arc Welding Using Differential Flatness Theory and Nonlinear Kalman Filtering

Automation of welding processes with use of mechanical welding equipment

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