Effect of Plasma Cutting on the Fatigue Resistance of Fe510 D1 Steel

1999 ◽  
Vol 122 (1) ◽  
pp. 141-145 ◽  
Author(s):  
M. Chiarelli ◽  
A. Lanciotti ◽  
M. Sacchi

The paper describes the results of a research programme, carried out at the Department of Aerospace Engineering of the University of Pisa, for the assessment of the influence of plasma cutting on the physical and mechanical properties of Fe510 D1, a low carbon steel widely used in carpentry. The activity started by observing that several industries rework plasma cut edges, particularly in the case of fatigue structures, in spite of the good quality of the plasma cut edges in a fully automatic process. Obviously, reworking is very expensive and time-consuming. Comparative fatigue tests demonstrated that the fatigue resistance of plasma cut specimens in Fe510 steel was fully comparable to that of milled specimens, as the consequence of the beneficial residual stresses which formed in the plasma cut edges. [S0094-4289(00)02201-5]

2018 ◽  
Vol 224 ◽  
pp. 01011 ◽  
Author(s):  
Andrey Rakhimyanov ◽  
Alexander Loktionov ◽  
Nadezhda Gaar

Improving the technologies and equipment at a stage of the blank production in mechanical engineering greatly determines the reduction in the technological production costs. The use of modern technological complexes on cutting sheet materials provides a solution to tasks for increasing the accuracy of forming. Nowadays high-precision plasma cutting is developing. It can be considered as an alternative to the laser cutting in achieving high characteristics of the cut accuracy and quality. The paper under consideration presents the results of optimizing the processing speed for the existing schemes of high-precision plasma cutting in the range of the cut thickness from 1 mm to 30 mm for carbon steel, alloy steel and aluminum steel. The efficiency of using the technological scheme HiFocusplus for cutting such bimetallic compositions as “steel St3 + steel 12H18N10T”, “steel St3 + aluminum A5M”, “steel St3 + copper M1” is presented. It is determined that the best characteristics of the accuracy and quality of the cut are achieved in cutting the composition “steel ST3 + steel 12H18N10T” from the side of low-carbon steel. Cutting from the side of aluminum and copper respectively is optimal for such compositions as “steel St3 + aluminum A5M” and “steel St3 + copper M1”.


2021 ◽  
pp. 85-91
Author(s):  
А.С. Угловский ◽  
И.М. Соцкая ◽  
Е.В. Шешунова

Цель рассмотрения численного метода заключалась в получении подробных данных, позволяющих оценить проведение сварочного процесса: изменение объёма сварного шва, радиуса сварного шва, радиуса зоны термического влияния. При проведении моделирования авторами выведены зависимости параметров точечной сварки низкоуглеродистой стали толщиной до 3,2 мм. Данные зависимости будут определять качество сварных швов. Соответствующее сочетание параметров точечной сварки обеспечит прочное соединение и хорошее качество сварки. The purpose of the numerical method consideration was to obtain detailed data allowing evaluating the performance of the welding process: changing the volume of the weld, the radius of the weld, the radius of the weld-affected zone. During the simulation the authors have derived dependencies of the parameters of spot welding of low-carbon steel up to 3.2 mm thick. These dependencies will determine the quality of the welds. The correct combination of spot welding parameters will ensure a firm joint and good welding quality.


2020 ◽  
Vol 987 ◽  
pp. 171-176
Author(s):  
Paphakorn Pittayachaval ◽  
Yanisa Aupkaew ◽  
Sirinat Sakhonkhan ◽  
Thittaya Sukan ◽  
Chirathorn Patchaikhonang

Plasma cutting machine widely uses in electrical conductivity industrial according to an accuracy dimension and minimum time consuming. A cutting surface and kerf are keys process parameter to establish process quality by controlling diameter of nozzle and size of electrode. Since kerf shape is crated base on nozzle diameter, while electrode is served plasma arc. This paper presents an investigating nozzle wear based on current ampere and processing time. The controlled variables are a plasma-cutting machine, Hypertherm powermax 45 xp, Bindee control CNC machine and cutting path as whorl specimen of low carbon steel. The current Ampere was handled at 35, 40, 45 A. The processing time was controlled at 1, 2, 3, 4, 5 minutes. The diameters of nozzle were measured using digital microscope. The experiments conducted based on ANOVA to establish the relationship of those parameters. The nozzle wear depended upon the current Ampere and processing time in which a regression equation was presented as a result.


2011 ◽  
Vol 314-316 ◽  
pp. 327-330
Author(s):  
Mohd Shahar Sulaiman ◽  
Yupiter H.P. Manurung ◽  
M. Ridhwan ◽  
N. L. Robert ◽  
M.A.R. Ridzwan ◽  
...  

In this paper, the capability of linear thermo-elastic numerical analysis method to estimate the welding deformations was investigated. The weld induced deformation is considered as the major stumbling block that can affect the dimensional accuracy. Based on this fact, welding distortion is necessarily to be predicted, if experimental investigation becomes expensive, to minimize the negative effects, improve the quality of welded parts and finally to reduce production cost. In this study, the welding distortions on butt and T-joints with thicknesses of 4 mm and 6 mm were simulated using relatively new FEM software WELD PLANNER developed by ESI Group. The material used for the simulation was low Carbon steel. By comparing the results between simulation and experiment, it was found out that this software provided immediate solution for computational analysis time and was capable to predict the distortion within acceptable accuracy.


2017 ◽  
Vol 863 ◽  
pp. 323-327 ◽  
Author(s):  
Yustiasih Purwaningrum ◽  
Panji Lukman Tirta Kusuma ◽  
Dwi Darmawan

The aimed of this research is to investigate the effect of T-Joint’s root gap on physical and mechanical properties of weld metal. Low carbon steel were joined in T-joint types using MIG (Metal Inert Gas) with variation of root gap. The root gap used were 0 mm, 3 mm and 6 mm. The physical properties examined with chemical composition, microstructure and corrosion using optical microscope. The mechanical properties were measured with respect to the strength and hardness using Universal testing machine and Vickers Microhardness. The results show that the highest value found in welds with a gap of 3 mm with a value of 163.57 MPa. Hardness value is directly proportional to the tensile strength of the material. The highest value found in welds with root gap of 3 mm, followed by root gap of 6 mm, and 0 mm Hardness values in the welding area is higher than the parent metal and HAZ because the number of Si, Mn and Cu elements in the welding metals are bigger than base metal. Weld with all variation of root gap have a good corrosion resistance because the corrosion rate in welds with various root gap have a value below 0.02 mmpy. Microstructure of weld metals were Accicular ferrite, Widmanstatten ferrite, and grain boundary ferrite, while microstructure of base metal and HAZ were ferrite and perlite.


Metallurgist ◽  
1988 ◽  
Vol 32 (9) ◽  
pp. 302-303
Author(s):  
V. G. Nosov ◽  
V. P. Godskov ◽  
V. K. Dubravina ◽  
T. Yu. Prikhod'ko

1990 ◽  
Vol 112 (3) ◽  
pp. 199-203 ◽  
Author(s):  
A. Okamoto ◽  
H. Nakamura

The influence of residual stress on fatigue crack growth was experimentally and analytically investigated for surface cracks. Fatigue tests were performed on straight pipes of low-carbon steel with a circumferential inner surface crack in laboratory air environment. Some of the test pipes had been subjected to special heat treatments so as to have compressive or tensile residual stresses along inner surface. The results show that the compressive residual stress remarkably suppresses the surface crack growth, while the tensile residual stress does not accelerate the crack growth very much. The crack growth analyses were conducted by the application of power relationship between ΔK and da/dN. The stress intensity factors due to the nonlinear stress field were calculated by the weight function method. The analyses resulted in a confirmation of the behavior of the crack growth observed in the experiments.


Author(s):  
В.А. Соколова ◽  
В.И. Кретинин ◽  
В.А. Марков ◽  
Л.Г. Черных

В работе освещены исследования качества газотермического покрытия и методы подготовки поверхности, непосредственно влияющие на него. Также опытным путем исследована и выявлена зависимость методов подготовки поверхности на качество газотермического покрытия. Упрочнение поверхностного слоя конструкционного материала газотермическими методами напыления является разновидностью поверхностного упрочнения деталей и позволяет решать многие важнейшие технические задачи, хотя сама по себе разработка и реализация таких технологических методов упрочнения представляет собой исключительно сложную проблему науки и производства. Работающие на производстве отечественные и зарубежные установки имеют право на реализацию, однако целесообразность применения любого технологического процесса определяется не его оригинальностью, а прежде всего качеством получаемой продукции и экономическими показателями. При выборе технологического оборудования наиболее важную роль играют не только его производительность и стоимость, но и надежность напылительного оборудования, возможность его сервисного обслуживания, наличие и доступность на рынке используемых материалов покрытия: газов, порошков. В ряду современных способов поверхностной обработки материалов газотермическое напыление занимает особое место. Важнейшим свойством, определяющим возможность применения видов газотермического напыления, особенно при ремонте изношенных деталей, является прочность сцепления. На прочность сцепления оказывает влияние характер распиливаемого металла. Так, покрытия из легкоплавких металлов, легко сцепляются с поверхностью любых металлов и не требуют особо тщательной подготовки. Это свойство широко используют, нанося на деталь первым слоем цинк толщиной 0,05–0,1 мм, а затем уже слои из любых металлов. Покрытия из стали, меди и бронзы требуют особо тщательной подготовки. Низкоуглеродистая сталь при распылении обладает лучшей сцепляемостью чем высокоуглеродистая.Металл, на который наносятся слои, играет существенную роль. Так, например, покрытия, нанесенные, на чугунные поверхности, вследствие пористости чугуна обладают большей сцепляемостью, чем покрытия, нанесенные на стальные детали. Объектом исследования является качество газотермического покрытия и методы подготовки поверхности, непосредственно влияющие на него. Цель работы – выявить и исследовать зависимость методов подготовки поверхности на качество газотермического покрытия.В результате, была доказана прямая зависимость параметра шероховатости поверхности от прочности сцепления при проведенных исследований на примере детали типа «втулка», а именно – с увеличением параметров шероховатости поверхности возрастает и прочность сцепления покрытия. In work researches of quality of a gas-thermal covering and methods of preparation of a surface which are directly influencing him are covered. The dependence of methods of preparation of a surface on quality of a gas-thermal covering is also by practical consideration studied and revealed. Hardening of a blanket of constructional material by gas-thermal methods of dusting is a kind of superficial hardening of details and allows to solve many major technical problems though development in itself and realization of such technological methods of hardening represents exclusively complex problem of science and production. The domestic and foreign installations working at a factory have the right for realization, however the expediency of application of any technological process is defined not by his originality, and first of all quality of the received production and economic indicators. At the choice of processing equipment the most important role is played not only by its productivity and cost, but also reliability of the napylitelny equipment, a possibility of his service existence and availability in the market of the used covering materials: gases, powders. Among modern ways of surface treatment of materials gasthermal dusting holds a specific place. The major property defining a possibility of application of types of gas-thermal dusting, especially at repair of worn-out details is coupling durability. The character of the sawn metal exerts impact on durability of coupling. So, coverings from fusible metals, are easily linked to the surface of any metals and don't demand especially thorough training. This property is widely used, applying on a detail with the first layer zinc 0.05–0.1 mm thick, and then layers from any metals. Coverings from steel, copper and bronze demand especially thorough training. Low-carbon steel at dispersion has the best stickiness what vysokokuglerodisty. Metal on which layers are applied plays a sushchestkvenny role. So, for example, the coverings put on pig-iron surfaces, owing to porosity of cast iron obkladat bigger stickiness, than the coverings applied on steel details. Object of a research is the quality of a gas-thermal covering and methods of preparation of a surface which are directly influencing him. The work purpose – to reveal and investigate dependence of methods of preparation of a surface on quality of a gasthermal covering. As a result, the direct dependence of parameter of roughness of a surface on coupling durability at the conducted researches on the example of a detail like «plug» has been proved, and parameters of roughness of a surface, nominal with increase, also durability of coupling of a covering increases.


1995 ◽  
Vol 66 (2) ◽  
pp. 55-62 ◽  
Author(s):  
Rodolfo Morales Dávila ◽  
David Jaramillo Vigueras ◽  
Miguel Toledo Velázques

Sign in / Sign up

Export Citation Format

Share Document