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2. ДИСПЕРСИОННОЕ МОДИФИЦИРОВАНИЕ ДЕНДРИТНОЙ СТРУКТУРЫ МЕТАЛЛА СВАРНЫХ ШВОВ
- Author
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Головко, В. В., Степанюк, С. Н., and Ермоленко, Д. Ю.
- Abstract
Copyright of Automatic Welding / Avtomatitcheskaia Svarka is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
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3. НЕКОТОРЫЕ ТЕХНОЛОГИЧЕСКИЕ ОСОБЕННОСТИ ВЫПОЛНЕНИЯ МОНТАЖНО -СВАРОЧНЫХ РАБОТ ПРИ СООРУЖЕНИИ ИЗОТЕРМИЧЕСКИХ РЕЗЕРВУАРОВ
- Author
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БЕЛОЕВ, М. and ЛОЛОВ, Н.
- Abstract
Copyright of Automatic Welding / Avtomatitcheskaia Svarka is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
4. ВЛИЯНИЕ СОСТАВА И СТРУКТУРЫ ЖИДКОГО СТЕКЛА НА ПРОЧНОСТЬ ПОКРЫТИЙ НИЗКОВОДОРОДНЫХ ЭЛЕКТРОДОВ
- Author
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МАРЧЕНКО, А. Е., ТРАЧЕВСКИЙ, В. В., and СКОРИНА, Н. В.
- Abstract
Copyright of Automatic Welding / Avtomatitcheskaia Svarka is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
5. СВАРИВАЕМОСТЬ ВЫСОКОПРОЧНЫХ ЛЕГИРОВАННЫХ СТАЛЕЙ С ПРЕДЕЛОМ ТЕКУЧЕСТИ 590...785 МПа.
- Author
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ПОЗНЯКОВ, В. Д.
- Abstract
Copyright of Automatic Welding / Avtomatitcheskaia Svarka is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
6. ВЛИЯНИЕ ПАРАМЕТРОВ ДУГОВОЙ, ЛАЗЕРНОЙ И ГИБРИДНОЙ СПОСОБОВ СВАРКИ НА СТРУКТУРУ И СВОЙСТВА СТыКОВыХ СВАРНыХ СОЕДИНЕНИЙ ВыСОКОПРОЧНОЙ СТАЛИ S460M.
- Author
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ПОЗНЯКОВ, В. Д., ШЕЛЯГИН, В. Д., ЖДАНОВ, С. Л., БЕРНАЦКИЙ, А. В., МАКСИМЕНКО, А. А., and СИОРА, А. В.
- Abstract
Copyright of Automatic Welding / Avtomatitcheskaia Svarka is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
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7. Welding Current Distribution in the Work-piece and Pool in Arc Welding
- Author
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A. M. Rybachuk and J. Gu
- Subjects
arc welding ,electric field ,welding current density ,heat flux ,Gauss heat source ,Computer engineering. Computer hardware ,TK7885-7895 ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
In order to select the optimal configuration of controlling magnetic fields and build rational construction of magnetic systems, we need to know the distribution of welding current in the molten metal of the weld pool. So the objective of the work is to establish the calculated methods for determining current density in the weld pool during arc welding. The distribution of welding current in the pool depends on the field of the electrical resistance, which is determined by the deformed temperature field while arc moves with the welding speed. The previous works have shown experimentally and by simulation on the conductive paper that deformation of temperature field defines deformation of electric field. On the basis thereof, under certain boundary conditions the problem has been solved to give a general solution of differential equation, which relates the potential distribution to the temperature in the product during arc welding. This solution is obtained under the following boundary conditions: 1) metal is homogeneous; 2) input and output surfaces of heat flux and electric current coincide; 3) input and output surfaces of heat flux and electric current are insulated and equipotential; 4) other (lateral) surfaces are adiabatic boundaries. Therefore, this paper pays basic attention to obtaining the analytical solution of a general differential equation, which relates distribution of potential to the temperature in the product. It considers the temperature field of the heat source, which moves at a welding speed with normal-circular distribution of the heat flow at a certain concentration factor. The distribution of current density is calculated on the assumption that the welding current is introduced through the same surface as the heat flux and the distribution of current density corresponds to the normally circular at a certain concentration factor. As a result, we get an expression that allows us to calculate the current density from the known distribution of heat flux density in the product. Using the results we can define the desired configuration of magnetic fields to create the necessary electromagnetic forces in the weld pool.
- Published
- 2015
- Full Text
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8. INCREASING THE EFFICIENCY OF THE ALLOYED LAYER FORMATION WHEN HARDENING TUNGSTEN CARBIDE WITH COMBINED METHODS
- Author
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Mr. Anatoly D. Verkhoturov, Mr. Yaroslav A. Vostrikov, Mr. Anton A. Rybalkin, and Ms. Alina O. Gnatik
- Subjects
electric spark alloying ,the surface layer ,hard alloy ,wear resistance ,micro hardness ,arc welding ,laser melting ,combined methods ,General Works - Abstract
This article describes the research aimed at improving the tungsten carbide durability with the help of spark alloying methods, arc welding and laser processing. The paper presents the formation of the alloyed layer thickness of more than 1400 mm with gradient transition properties. The parameters of the islet coating formation for durability improvement by laser processing are represented.
- Published
- 2016
- Full Text
- View/download PDF
9. Forming Coatings from Self-Fluxing Powder Based on Steels of Austenite Class Adding Molybdenum
- Author
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F. I. Panteleenko, V. A. Okovity, O. G. Devoino, V. V. Okovity, A. S. Volodko, and V. M. Astashinsky
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powders ,Technology ,Materials science ,austenitic steels ,Abrasion (mechanical) ,engineering.material ,law.invention ,materials ,molybdenum ,Coating ,Powder coating ,law ,morphology ,Austenite ,abrasive wear resistance ,Shielding gas ,Metallurgy ,plasma spraying ,phase characteristics ,General Medicine ,Microstructure ,coating structure ,reflow ,Vickers hardness test ,engineering ,Arc welding - Abstract
The paper presents a study of the effect of adding Mo and MoS2 on the microstructure and properties of a powder coating based on austenitic steels. The coatings have been studied using X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM), a Vickers hardness tester, and abrasion wear resistance has been determined by the Pin on disk method. The results show that a coating that does not contain Mo and MoS2 consists of the phases g(Fe), M7(C, B)3 and (Fe, Cr)2B. The addition of Mo and MoS2 leads to the formation of phases M23(C, B)6, Mo2(B, C) and Fe3Mo3(C, B), where M = Fe, Cr, Mo. The main goal of these studies was to study characteristics of Mo and MoS2 distribution and the effect of their addition on the microstructure, hardness, and abrasion wear resistance of an alloy coating based on austenitic steels. Composite materials based on austenitic steels obtained by diffusion alloying (Aus0Mo), which has a nearly spherical shape with a diameter of 50–100 μm, have been used for deposition. 3–7 wt. % of Mo powder and 1.0–1.5 wt. % of MoS2 powder with a diameter less than 50 μm have been added in the powder of the composite material based on austenitic steels (Aus3Mo, Aus5Mo, Aus7Mo). Surfacing methods, including gas arc welding with a tungsten electrode, arc welding in shielding gas, plasma surfacing (PTA) and laser surfacing are widely used in industry to increase wear resistance of surfaces. The most important differences between these methods are deposition rate, applicability of materials, substrate dilution, microstructure and hardness stability after exposure to high temperatures, as well as manufacturing cost. Among the methods described above, plasma spraying followed by fusion is a good alternative to other surfacing processes. The coating should not be overheated until it is completely melted, since in this case the primary crystals of chromium carbides and borides pass into a liquid solution and upon subsequent crystallization, form a coarser structure, worsening the quality of the coating. This is precisely what does not occur during plasma spraying followed by reflow; in addition, the method is cheap, coatings are of high quality, competitive wear resistance and high stability of properties at high temperature.
- Published
- 2021
10. Способы управления подачей электродной проволоки при дуговой механизированной сварке и наплавке
- Author
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Volodymyr O. Lebediev, Stanislav V. Drahan, and Hennadii V. Zhuk
- Subjects
Materials science ,law ,Metallurgy ,Electrode ,fuel oil ,water-oil emulsion ,low-temperature corrosion ,variable conditions ,reliability ,General Medicine ,Arc welding ,дугове зварювання ,механізований процес ,система подачі ,вдосконалення ,розвиток ,імпульсні алгоритми управління ,law.invention ,дуговая сварка ,механизированный процесс ,система подачи ,совершенствование ,развитие ,импульсные алгоритмы управления - Abstract
The article analyzes the conventional and new methods and control systems for electrode wire feeding in the arc welding and surfacing equipment. Special attention is paid to the feed rate control (stabilization) systems. The major part of the paper considers pulsed and oscillatory feed systems. They allow obtaining a number of technological effects that significantly improve the quality of the welded joint and expand the scope of application of the mechanized equipment, including the spheres of manufacture and repair in shipbuilding and ocean engineering. It is shown that advanced technical means allow solving virtually any technical problem related to control of the electrode metal transfer., Представлен анализ традиционных и новых способов и систем управления подачей электродной проволоки в оборудовании для дуговой сварки и наплавки, особое внимание уделено системам регулирования (стабилизации) скорости подачи. Значительная часть работы посвящена импульсным и колебательным системам подачи, позволяющим получить ряд технологических эффектов, существенно повышающих качество сварного соединения и расширяющих сферу применения механизированного оборудования, в том числе при изготовлении и ремонте объектов судостроения и океанотехники. Показано, что современные технические средства дают возможность решить практически любые технические задачи, связанные с управлением переносом электродного металла., Подано аналіз традиційних і нових способів і систем управління подачею електродного дроту в обладнанні для дугового зварювання й наплавлення, особливу увагу приділено системам регулювання (стабілізації) швидкості подачі. Значну частину роботи присвячено імпульсним і коливальним системам подачі, що дозволяють отримати ряд технологічних ефектів, які істотно підвищують якість зварного з’єднання й розширюють сферу застосування механізованого устаткування, у тому числі при виготовленні та ремонті об’єктів суднобудування та океанотехніки. Показано, що сучасні технічні засоби дають можливість вирішити практично будь-які технічні завдання, пов’язані з управлінням перенесенням електродного металу.
- Published
- 2017
11. Laser and hybrid laser-arc welding of cryogenic 9%Ni steel
- Author
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Abdel-Monem El-Batahgy, Michael Rethmeier, Sergej Gook, and Andrey Gumenyuk
- Subjects
Filler metal ,Materials science ,Gas tungsten arc welding ,Metallurgy ,ХЛАДОСТОЙКИЕ СТАЛИ,НИКЕЛЬСОДЕРЖАЩИЕ СТАЛИ,ЛАЗЕРНАЯ СВАРКА,ПЕРЕМЕШИВАНИЕ,ПРЕДЕЛ ПРОЧНОСТИ,CRYOGENIC STEEL,LASER WELDING,MICROSTRUCTURE,HARDNESS,TENSILE STRENGTH ,Laser beam welding ,Shielded metal arc welding ,Welding ,Submerged arc welding ,law.invention ,Gas metal arc welding ,law ,Arc welding ,Composite material - Abstract
Термообработанные конструкционные хладостойкие стали с содержанием никеля до 9% считаются наиболее подходящим по своим стоимостным показателям материалом для изготовления элементов криогенных систем в различных сегментах энергетического машиностроения. Данный тип сталей характеризуется высокими прочностными показателями в сочетании с высокими значениями ударной вязкости при температурах эксплуатации до -196 0C. Для сварки хладостойких никельсодержащих сталей рекомендованы, и в настоящее время широко используются присадочные материалы на основе никеля. Основной проблемой этого выбора является снижение предела текучести металла сварного шва, которое компенсируется за счет увеличения толщины стенки изделия. Присадочные материалы на никелевой основе относительно дороги и необходимы в большом количестве для заполнения разделок под многопроходную сварку. Эти факторы значительно увеличивают затраты при изготовлении крупногабаритных толстостенных изделий, как например резервуаров для хранения сжиженного природного газа. По этим причинам, освоение новых сварочных технологий представляет большой экономический интерес. Значительный потенциал предлагают методы сварки, основанные на применении современных высокомощных оптоволоконных лазеров. Лазерный луч приводит к возникновению гораздо меньшей зоны плавления по сравнению с традиционными, дуговыми процессами. При этом уменьшается тепловая нагрузка на основной металл. Металл шва по своему химическому составу и прочностным свойствам приближается к основному металлу. Форма разделки под лазерную сварку толстостенных изделий подразумевает наличие высокого притупления проплавляемого за один проход, что позволяет значительно сократить количество присадочного материала, необходимого для заполнения разделки. До настоящего времени подробные исследования относительно применения лазерных технологий для сварки хладостойкой никельсодержащей стали не были проведены. В настоящей работе рассмотрены особенности формирования сварного шва при лазерной и гибридной лазерно-дуговой сварке листов хладостойкой никельсодержащей стали толщиной 11,5 мм. Рекомендованы параметры процесса, обеспечивающие стабильное проплавление стыка и равномерное формирование корня шва. С помощью электроннозондового микроанализа определена глубина проникновения и исследован характер распределения присадочной проволоки в узком гибридном лазерно-дуговом шве. Испытания на разрыв не выявили снижения прочностных свойств как лазерных, так и гибридных лазерно-дуговых швов. Разрушение испытанных образцов происходит по основному металлу вдали от сварного шва., Heat treated 9%Ni steel is considered the most suitable and economic material for construction of large-size liquefied natural gas (LNG) storage tanks which operate at cryogenic temperatures (-196°C). Strength above 700 MPa as well as a minimum impact value of 60 J are required to ensure reliable operation of the LNG tanks at operating temperature. Conventional arc welding processes, including shielded metal arc welding, gas metal arc welding, gas tungsten arc welding and submerged arc welding, are currently used in construction of LNG tanks. Ni based filler wire is the preferred filler metal of choice in LNG tank construction. The main problem with this choice is the lower mechanical properties, particularly tensile strength of the weld metal. To compensate, the wall thickness needs to be excessively thick to ensure the strength of the welded structures. Ni based filler material is expensive and a large quantity is needed to fill the multi-pass weld grooves. These factors significantly add to the cost in the fabrication of LNG storage tanks. For these reasons, exploration of new welding technologies is a priority. A big potential can be seen in laser based welding techniques. Laser beam welding results in much smaller fusion zone with chemical composition and mechanical properties similar to that of the base material. Laser welding is a much faster process and allows for a joint geometry which requires less filler material and fewer welding passes. The advantages of laser welding can help to overcome the problems pointed out above. Trials of autogenous laser welding, laser cold-wire welding and hybrid laser-arc welding conducted on the 9%Ni steel are presented in this paper. Chemical composition of the weld metal as well as effects of welding parameters on the weld formation, microstructure and tensile strength is discussed. Filler wire penetration depth as well as character of its distribution in the narrow laser welds was examined using EPMA electron probe microanalysis.
- Published
- 2016
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