Analysis of the Effects of Welding Conditions on the Formation of the Structure of Welded Joints of Low-Carbon Low-Alloy Steels

Laukhin, D. V.; Pozniakov, Valerii; Beketov, Olexander; Rott, Nicholas; Shchudro, Anatolii

doi:10.4028/www.scientific.net/kem.844.146

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…При цьому висока механічна міцність марки вможливлює створення більш тонких виробів, ніж із інших сталей [4][5][6]. Також зі сталі 09Г2С виготовляють парові котли, різноманітні труби для транспортування газів і рідин (нафта, вода, природній газ), нафтогазове обладнання, компоненти сільськогосподарських машин [7][8][9]. Висока термостійкість дозволяє використовувати дану сталь за широкого спектру температур, від -70 °C до +450 °C.…”

Section: матеріалознавствоunclassified

Determination of the Effectiveness of the Shielding Gas Change on the Impact Toughness of 09g2s Steel Butt-Welded Joints Obtained via Laser Welding

Bernatskyi¹,

Siora²,

Sokolovskyi³

et al. 2022

Transactions of Kremenchuk Mykhailo Ostrohradskyi National Univ

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Rolled 09G2S steel is used in the production of differently shaped and sized building structures. At the same time, the high mechanical strength of the material allows for the creation of thinner products compared to steels. Steam boilers, various pipes for transporting gases and liquids, oil and gas equipment as well as components of agricultural machines are also made from 09G2S steel. High heat resistance of this steel alloy allows for its usage in a wide range of temperatures. According to the standard, this steel is meant for creation of welded constructions, however, in reality the scope of its usage is very wide, being the most widely used steel alloy in Ukraine. It is from this material that most of the rolled complex shape products of increased strength are made. Also, it is the most used type of steel alloy, from which the high-strength sheets intended for pressure vessels are made. Such methods of welding 09G2C steel as: manual arc, arc under flux, arc in a protective gas environment, argon arc with a non-fusible electrode as well as contact welding are quite well researched. Meanwhile, for such innovative methods of welding such as laser welding, the need to determine the dependence of changes in the characteristics of welded joints, when the parameters of the welding modes are varied, is becoming more relevant. The aim of this study is to establish the effectiveness of changing the shielding gas on the impact toughness of 09G2S steel butt-welded joints obtained by laser welding. According to the results of the research, the effectiveness of shielding gas changes on the impact toughness of butt-welded joints of 09G2S steel obtained by laser welding was calculated. It was shown that the replacement of the 82% Ar + 18% CO 2 gas mixture with CO 2 leads to an increase in both the absolute values of the indicators as well as a decrease in the spread of values, both for the seam and for the heat-affected zone. For samples welded using CO 2 , an increase in the welding speed leads to a decrease of the absolute KCU values for both the weld metal and the heat-affected zone. The same trend is observed for samples welded using a gas mixture of 82% Ar + 18% CO 2 . To reduce the financial costs of manufacturing products containing butt-welded joints made of 09G2C steel, it is recommended to use CO 2 as a shielding gas during laser welding.

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Section: матеріалознавствоunclassified

Determination of the Effectiveness of the Shielding Gas Change on the Impact Toughness of 09g2s Steel Butt-Welded Joints Obtained via Laser Welding

Bernatskyi¹,

Siora²,

Sokolovskyi³

et al. 2022

Transactions of Kremenchuk Mykhailo Ostrohradskyi National Univ

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“…The greatest importance in ensuring the strength and reliability of a welded joint is rendered to specific processes that evolve after the crystallization of the joint in the nearjoint zone. The value of the thermal impact zone depends on the technique and technology of welding, as well as the properties of welded metal [5].…”

Section: Welding Thermomechanically-strengthened Materials Is Accompanied With Certain Difficulties In Terms Of Loss Of Strength Charactementioning

confidence: 99%

“…3, b, d, f shows the clearly defined boundaries of the interface between zone I and zone II. This element of the structure of the welded joint, according to the literary sources [5], is termed the line or boundary of fusion.…”

Section: Analysis Of Morphological Features Of the Structure Of A Welded Jointmentioning

confidence: 99%

Features in the formation of the structural state of low-carbon micro-alloyed steels after eletron beam welding

Laukhin

Poznyakov

Костін

et al. 2021

EEJET

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Welding thermomechanically-strengthened materials is accompanied with certain difficulties in terms of loss of strength characteristics in the zone of thermal influence. This issue can be resolved by using the technological welding schemes that include fusion of materials in a narrow contact area. One such technological scheme is electron beam welding, which is currently widely used to fabricate structures from refractory and chemically active materials. One of the main advantages of the electron beam welding process is a small quantity of heat input, which leads to the formation of narrow zones of melting and thermal influence and, as a result, minor deformities in the structure of the material. The welded joint can structurally be divided into several zones, which differ in the morphological characteristics of the structure. The most interesting, in terms of ensuring the quality of the joint, are the boundaries between the zones. It has been shown that the use of local heating sources, which is the case at electron beam welding, leads to the migration of the boundaries of grains. As a result, clear intersections, fusion lines, form at the boundaries between zones of the welded joint. The formation of the structural state of a welded joint is predetermined by the simultaneous course of several processes. First, a crystallization from the liquid state – the formation of a welded joint structure, as well as the boundary between a welded joint and the zone of thermal influence. Second, the phase-structural transformations in the solid state – a thermal impact zone, the boundary between a thermal impact zone and the main metal. Given this, one should note that the geometry and quality of joints at electron beam welding are more interrelated than in other welding techniques. Thus, one of the main parameters that ensure the quality of a welded joint is the structural state of the material that forms during welding

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Use of the Processing Arrays Theory of Experimental Data for the Analysis of the Technological Scheme in the Rolled Metal Production – Controlled Rolling

Beketov,

Laukhin,

Rott

et al. 2024

Lecture Notes in Mechanical Engineering

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Analysis of the Effects of Welding Conditions on the Formation of the Structure of Welded Joints of Low-Carbon Low-Alloy Steels

Cited by 9 publications

References 4 publications

Determination of the Effectiveness of the Shielding Gas Change on the Impact Toughness of 09g2s Steel Butt-Welded Joints Obtained via Laser Welding

Determination of the Effectiveness of the Shielding Gas Change on the Impact Toughness of 09g2s Steel Butt-Welded Joints Obtained via Laser Welding

Features in the formation of the structural state of low-carbon micro-alloyed steels after eletron beam welding

Use of the Processing Arrays Theory of Experimental Data for the Analysis of the Technological Scheme in the Rolled Metal Production – Controlled Rolling

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