Investigations on the impact toughness of HSLA steel arc welded joints

2016 ◽  
Vol 21 ◽  
pp. 75-86 ◽  
Author(s):  
Rishi Pamnani ◽  
T. Jayakumar ◽  
M. Vasudevan ◽  
T. Sakthivel
Keyword(s):  
Impact Toughness ◽  
Welded Joints ◽  
Hsla Steel ◽  
The Impact

scholarly journals Analysis of Influence of the Welding Procedure on Impact Toughness of Welded Joints of the High-Strength Low-Alloyed Steels

2020 ◽  
Vol 10 (7) ◽  
pp. 2205 ◽  
Author(s):  
Andreja Ilić ◽  
Ivan Miletić ◽  
Ružica R. Nikolić ◽  
Vesna Marjanović ◽  
Robert Ulewicz ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Welded Joints ◽  
Hsla Steel ◽  
High Strength ◽  
Inert Gas ◽  
Welding Technology ◽  
First Case ◽  
Low Alloyed Steel ◽  
Welding Procedure ◽  
The Impact

This paper presents results of comparison of two welding procedures’ influence on selected properties of the welded joints of high-strength low-alloyed steel (HSLA), specifically the impact toughness and the hardness distribution in the specific zones of “single V” butt multiple-pass welded joints. Based on results obtained from experiments, the two applied welding technologies were evaluated. They differ by the welding grove geometry and by the applied root pass welding procedure. Both procedures use MAG (Metal Active Gas) welding for execution of the filling and covering passes, while the root passes are executed by the MMA (Manual Metal Arc) procedure in the first case and by the MIG (Metal Inert Gas) procedure in the second. Experimentally obtained values of the fracture energy of the welded samples for both procedures were smaller than the values for the parent metal, which confirms the fact that welding causes degradation of the mechanical properties of HSLA steel; thus, any welding technology parameters must be so selected to mitigate this deficiency.

scholarly journals Impact strength of Friction Stir Welded joints of dissimilar Aluminum alloy

2020 ◽  
Vol 9 (4) ◽  
pp. 2491-2496
Keyword(s):  
Aluminum Alloy ◽  
Impact Toughness ◽  
Impact Strength ◽  
Welded Joints ◽  
Response Surfaces ◽  
Design Matrix ◽  
Friction Stir ◽  
Contour Plots ◽  
Fsw Parameters ◽  
The Impact

Joining processes has been the heart of the manufacturing processes. Welding has played an important part in joining processes since its inception. Friction Stir Welding (FSW) has given promising results especially in the case of aluminum alloys. In the present paper, dissimilar aluminum alloy heat-treatable AA6082 T651and non-heat treatable AA 5083 O were friction stir welded as per design matrix generated according to the rotatable central composite design of response surface methodology. Impact toughness was measured from samples of welded joints. The impact toughness was mapped in terms of FSW parameters and the regression equation is generated. The response surfaces and contour plots are drawn and interpreted. The input parameters are optimized to achieve maximum impact strength. Confirmation runs were performed and found results were found close to the optimized values. The present research is useful for further augmentation of the FSW process of aluminum alloy.

scholarly journals Analysis of Selected Properties of Welded Joints of the HSLA Steels

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1301 ◽  
Author(s):  
Ivan Miletić ◽  
Andreja Ilić ◽  
Ružica R. Nikolić ◽  
Robert Ulewicz ◽  
Lozica Ivanović ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Welded Joints ◽  
Welded Joint ◽  
High Strength ◽  
Hardness Distribution ◽  
Micro Hardness ◽  
Hsla Steels ◽  
Applied Technology ◽  
Welding Procedure ◽  
The Impact

This paper presents research of the impact toughness and hardness distribution in specific zones of a ‘single V’butt multiple-pass welded joints of the high-strength low-alloyed steels. Obtained values of the impact toughness are analyzed in correlation with a microstructure in specific zones of the welded joint, together with the micro hardness distribution found in the related zones. Based on the carried out analysis and results obtained in experiments, the applied technology of welding was evaluated. The original conclusions on influence of the selected welding procedure manual metal arc (MMA) for the root passes and metal active gas (MAG) for the filling and covering passes) on impact toughness of the high-strength low-alloyed steels are drawn. The paper also presents discussion on the valid standards and recommendations related to welding of those steels, from the aspect of applications in design of steel welded constructions.

Effect of welding conditions on the impact toughness of welded joints in titanium alloys

2011 ◽  
Vol 25 (9) ◽  
pp. 700-702
Author(s):  
V. Yu. Zubarev ◽  
B. A. Kolomenskii ◽  
A. B. Kolomenskii
Keyword(s):  
Impact Toughness ◽  
Titanium Alloys ◽  
Welded Joints ◽  
The Impact

Role of the V-Notch Location in the Impact Toughness of 9 Pct Cr-CrMoV Dissimilar Welded Joints

2020 ◽  
Vol 51 (4) ◽  
pp. 1699-1706 ◽  
Author(s):  
Kai Ding ◽  
Bingge Zhao ◽  
Xin Huo ◽  
Manjie Fan ◽  
Xiaohong Li ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Welded Joints ◽  
The Impact

scholarly journals Weldability of S700MC steel welded with the hybrid plasma + MAG method

2020 ◽  
Vol 7 ◽  
pp. 4 ◽  
Author(s):  
Beata Skowrońska ◽  
Tomasz Chmielewski ◽  
Dariusz Golański ◽  
Jacek Szulc
Keyword(s):  
Impact Toughness ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
High Efficiency ◽  
Bending Test ◽  
Mag Welding ◽  
High Yield ◽  
Hybrid Plasma ◽  
The Impact ◽  
Welding Processes

The paper describes the microstructure of welded joints produced by the plasma+MAG (Metal Active Gas) method of S700MC high yield strength steel (700 MPa). Welded joints of thermomechanical steel have been made with different values of heat input. The results of metallographic research of welded joints, microstructure of the weld and heat affected zone, hardness distribution and impact toughness are presented. The heat affected zone consists of two sub-zones with different grain size and lowered hardness. The tensile test show that strength of welded joints was slightly reduced and the bending test revealed no crack formation in the weld. The impact toughness of measured welded samples with V-notch in HAZ (heat affected zone) reached high values that are higher comparing to samples with notch placed in the weld area. The investigation results show that the use of plasma concentrated heat source together with MAG welding arc does not significantly change the structure and deteriorate properties of welded S700MC thermomechanically treated high strength steel. The hybrid plasma+MAG welding method has a potential to become a beneficial alternative to other welding processes due to its high efficiency, reduced amount of weld metal content or limited requirements for a preparation of edges of welded joints.

Evaluation of the impact toughness of explosion‐welded joints

2002 ◽  
Vol 16 (5) ◽  
pp. 415-416
Author(s):  
Yu P Trykov ◽  
V G Shmorgun
Keyword(s):  
Impact Toughness ◽  
Welded Joints ◽  
The Impact

Расчетные методы оценки ударной вязкости сварных элементов с трещинами

2020 ◽  
Vol 44 (3) ◽  
pp. 22-36
Author(s):  
Keyword(s):  
Stress Intensity ◽  
Impact Strength ◽  
Welded Joints ◽  
Development Process ◽  
Welded Joint ◽  
Operating Temperature ◽  
Crack Development ◽  
Heterogeneous Structure ◽  
Critical Crack Length ◽  
The Impact

Практика показывает, что для сварных конструкций, эксплуатируемых в условиях Крайнего Севера необходимо уделять внимание работоспособности сварных соединений при низких температурах. Металл сварных соединений в процессе воздействия обработки изменяет свои свойства, снижается ударная вязкость, образуется гетерогенная структура с большой степенью разнозернистости. Чтобы оценивать и иметь возможность правильно контролировать термическое воздействие и последствия сварочного процесса, требуется решить задачу аналитического определения ударной вязкости для всех зон сварного соединения. В настоящей статье представлен инженерный метод оценки ударной вязкости, применимый для любой зоны сварного соединения, в которой имеется острый или особый концентратор напряжений – трещина. Разработанный аналитический метод расчета ударной вязкости отражает качественную и количественную картину взаимосвязи структурно-механических характеристик и работы развития трещины в диапазоне температур 77…300 К. Предложенная схематизация зависимости критического коэффициента интенсивности напряжений от температуры позволила найти коэффициенты, характеризующие свойства материала, и выполнить расчеты изменения предела текучести и предела прочности от температуры эксплуатации. Построены графики зависимости работы развития трещины от температуры эксплуатации для сталей 15ГС и 17ГС, сравнение которых с экспериментальными данными показывает удовлетворительное согласование. Найдено, что при напряжениях предела выносливости отношение работы развития трещины к критической длине трещины постоянно, не зависит от температуры и для сталей 15ГС и 17ГС равно около 10. Ключевые слова: ударная вязкость, работа разрушения, коэффициент интенсивности напряжений, трещина, феррито-перлитная сталь, зона термического влияния. For welded structures under operation in the Far North, attention must be paid to the performance of welded joints at low temperatures. The properties of metal of welded joints are changed in the process of treatment, its toughness decreases, and a heterogeneous structure with a large range of different grain sizes is formed. In order to evaluate and be able to correctly control the thermal effect and the consequences of the welding process, it is necessary to solve the problem of analytical determination of impact strength for all zones of the welded joint. The paper presents an engineering method for evaluation of the impact strength applicable to any area of the welded joint in which there is a sharp or super sharp stress concentrator – a crack. The developed analytical method for calculating the impact strength reflects a qualitative and quantitative codependency of structural and mechanical characteristics and the process of crack development in the temperature range of 77–300 K. The proposed schematization of dependence of the critical coefficient of stress intensity on the temperature made it possible to find coefficients characterizing the properties of the material and to perform calculations of changes in yield strength and tensile strength on operating temperature. Graphs of the crack development process dependency on the operating temperature for 15ГС and 17ГС steels were constructed, and their comparison with experimental data displays satisfactory agreement. It was found that at endurance limit stresses, the ratio of the crack development process to the critical crack length is constant, non-dependent on temperature, and is equal to 10 for 15ГС and 17ГС steels. Keywords: impact strength, fracture work, stress intensity factor, crack, ferrite-pearlite steel, heat affected zone, steel tempering.

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