Impact and Effect Study of Submerged-Arc Welding Conditions on Structural Changes in Weld Metal

Bakhmatov, Pavel V.; Startsev, E.A.; Sobolev, Boris M.

doi:10.1007/978-3-030-69421-0_8

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…High rates of development of the territories in the Far North accentuated the problem of quality of welding of metal constructions being in service at low temperatures. A fundamental task is to produce welded joint with high operating characteristics providing the increase in reliability of work of fabricated metal products under the extreme conditions [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Structure, defect substructure and fracture surface of low-carbon alloy steel welds

Kozyrev¹,

Kryukov²,

Gromov³

et al. 2022

cisisr

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By the methods of scanning and transmission electron microscopy a structural phase state, defect substructure and fracture surface of low carbon alloy steel welds produced with use of carbon-containing addition and without it are investigated. The study of etched metallographic section structure of welds revealed a presence of a large amount of second phase particles (carbides, sulfides, oxides, etc.). It is shown that in weld with a carbon-containing addition the particles locate chaotically, and in weld without addition they decorate boundaries of ferrite grains. Dimensions of second phase particles vary in the limits from 0.8 μm to 5 μm and are identical for both types of welds. Analysis of fracture surface structure of welds is carried out. A presence of nonmetallic inclusions is detected. They are typical of mainly weld produced without a carbon-containing addition which may indicate its increased brittleness. Amount of micropores in fracture of weld with carbon-containing addition is many times greater than that in weld without addition, which is indicative of gas removal in use of carbon-containing addition. The quantitative analysis of structure and dislocation substructure parameters of weld metal is carried out, the estimates of contributions of scalar and excess dislocation density to strength of welds are performed. It is shown that higher values of scalar and excess dislocation density in the weld formed without carbon-containing addition in flux may be responsible for material embrittlement. A large quantity of stress concentrators in the weld without carbon-containing addition may result in material embrittlement.

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Section: Introductionmentioning

confidence: 99%

Structure, defect substructure and fracture surface of low-carbon alloy steel welds

Kozyrev¹,

Kryukov²,

Gromov³

et al. 2022

cisisr

View full text Add to dashboard Cite

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Scrap Deficit Problem at the Amurstal Metallurgical Plant and Search for Alternatives to Substitute It

Bakhmatov

Startsev²,

Grigoriev³

et al. 2022

Metallurgist

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Development of the Sequential Voids Creation Approach in Axisymmetric Forming Dies

Andrianov

2021

J. Phys.: Conf. Ser.

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The study deals with the problem of topological optimization of forming dies with a limitation on fatigue strength. As a model of a stamp, a typical geometric configuration of stamps for the manufacture of parts of the " cup " type is considered. The algorithm for finding the optimal topology is proposed to be built separately in the internal areas under the stamp flanges and under the bottom of the "cup" of forming. Mathematical regularities are presented, according to which elements that fall into the area of predicted removal have a very small elastic modulus, which is widely used in topological optimization methods, then the stress state level is analyzed according to the fatigue strength curve. In the area of the flanges, there is a "build-up" of the mass according to the quadratic law with a variation in the depth of removal of the material. In the area of the bottom of the " cup " of forming, a step-by-step addition of rod elements is proposed until the level of the stress state meets the specified restrictions. Thus, this study is a modification of the topological optimization method. The novelty of the research lies in the construction of a new geometric scheme for determining the area of stored and deleted elements. The results of the study can be further developed in the development of methods for effective redistribution of material, as well as significantly reduce the material costs for the production of metal forming dies.

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Impact and Effect Study of Submerged-Arc Welding Conditions on Structural Changes in Weld Metal

Cited by 3 publications

References 6 publications

Structure, defect substructure and fracture surface of low-carbon alloy steel welds

Structure, defect substructure and fracture surface of low-carbon alloy steel welds

Scrap Deficit Problem at the Amurstal Metallurgical Plant and Search for Alternatives to Substitute It

Development of the Sequential Voids Creation Approach in Axisymmetric Forming Dies

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