Effects of Laser Welding Conditions on Toughness of Dissimilar Welded Components

2006 ◽  
Vol 5-6 ◽  
pp. 375-380 ◽  
Author(s):  
E.M. Anawa ◽  
Abdul Ghani Olabi
Keyword(s):  
Impact Strength ◽  
Laser Welding ◽  
Low Carbon Steel ◽  
Base Material ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Welding Parameters ◽  
Taguchi Approach ◽  
Low Carbon ◽  
The Impact

Welding dissimilar materials become inevitable in engineering industries. There are many issues/problems associated with the welding of dissimilar materials, related to the welding process and its parameters. The current work investigates the effect of laser welding conditions on the toughness of dissimilar welded components. In this study, CO2 laser welding has been successfully applied for joining 316 stainless steel with low carbon steel (F/A). Design of experiment techniques has been used for different effective welding parameters (laser power, welding speed, and focus position) to optimize the dissimilar F/A joints in terms of its mechanical properties. Taguchi approach was applied to optimize the welding parameters. Three factors with five levels each (L-25) were employed in these models. Impact strength was measured at room temperature by using the universal pendulum impact tester. The results were compared with the impact strength of the base material. The results were analysed using ANOVA and S/N ratio for optimal parameters combination. It is evident that Taguchi approach has decreased the number of experiments without negative effects on the result.

scholarly journals A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4179
Author(s):  
Arkadiusz Krajewski ◽  
Grzegorz Klekot ◽  
Marcin Cybulak ◽  
Paweł Kołodziejczak
Keyword(s):  
Laser Welding ◽  
Low Carbon Steel ◽  
Base Material ◽  
Welding Process ◽  
Contactless Method ◽  
Acoustic Vibrations ◽  
Low Carbon ◽  
The Face ◽  
Grain Size And Shape ◽  
The Impact

The research described in this article presents a new contactless method of introducing mechanical vibrations into the base material during CO2 laser welding of low-carbon steel. The experimental procedure boiled down to subjecting a P235GH steel pipe with a 60 mm diameter, 3.2 mm wall thickness and 500 mm length to acoustic signals with a resonant frequency during the welding process. Acoustic vibrations with a frequency of 1385, 110 and 50 Hz were introduced into the pipe along the axis and transversely from the outer surface. The obtained welds were then subjected to structural tests and Vickers hardness measurements. The results of comparative tests show the impact of such introduced vibrations on the granular structure of the welds, as well as on their microhardness in specific areas, such as the face, penetration depth and the heat-affected zone. The effectiveness of the proposed method of introducing vibrations in the scope of grain size and shape as well as changes in the hardness distribution in the obtained welds is demonstrated.

scholarly journals Numerical Simulation Mode of Spot Contact Welding Processes

2021 ◽  
pp. 85-91
Author(s):  
А.С. Угловский ◽  
И.М. Соцкая ◽  
Е.В. Шешунова
Keyword(s):  
Spot Welding ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Welding Parameters ◽  
Low Carbon ◽  
Detailed Data ◽  
Welding Quality ◽  
Welding Processes ◽  
Contact Welding

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.

scholarly journals Performance Evaluation of the Effects of Post Weld Heat Treatment on the Microstructure, Mechanical and Corrosion Potentials of Low Carbon Steel

2019 ◽  
Vol 44 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Isiaka Oluwole Oladele ◽  
Davies Babatunde Alonge ◽  
Timothy Olakunle Betiku ◽  
Emmanuel Ohiomomo Igbafen ◽  
Benjamin Omotayo Adewuyi
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Post Weld Heat Treatment ◽  
Welding Parameters ◽  
Low Carbon ◽  
Corrosion Properties ◽  
Mechanical And Corrosion Properties ◽  
Weld Heat

The effect of Post Weld Heat Treatment (PWHT) on the microstructure, mechanical and corrosion properties of low carbon steel have been investigated. The welding process was conducted on butt joint using Manual Metal Arc Welding (MMAW) techniques at a welding voltage of 23 V and welding current of 110 A with the use of E6013 and 3.2 mm diameter as filler material. Heat treatment through full annealing was carried out on the welded low carbon steel. The mechanical properties (hardness, impact toughness and tensile properties) of the AW and PWHT samples were determined. The microstructure of the AW and PWHT samples was characterized by means of an optical microscopy. Corrosion behavior of the sample was studied in3.5 wt.% NaCl environment using potentiodynamic polarization method. The results showed that the AW samples has good combination of mechanical and corrosion properties. The microstructure revealed fine grains of pearlite randomly dispersed in the ferrite for the AW base metal (BM) sample while agglomerated and fine particle of epsilon carbide or cementite randomly dispersed on the ferritic phase of the heat affected zone (HAZ) and weld metal (WM), of the AW, respectively. The PWHT samples shows that the annealing process allow diffusion and growth of the fine grains into partial coarse grains of ferrite and pearlite which did not encourage improvement of the properties. Therefore, it was concluded that the welding parameters put in place during welding of the low carbon steel are optimum for quality weld.

EFFECT OF ELECTRIC ARC WELDING ON IMPACT OF DIFFERENT MILD STEEL WELD GEOMETRIES

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Vaishak NL ◽  
Suhas Suhas ◽  
Vilas K Bhosle ◽  
Prashanth T
Keyword(s):  
Welded Joint ◽  
Testing Machine ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
Impact Testing ◽  
Welding Parameters ◽  
Low Carbon ◽  
Electrode Diameter ◽  
Current Electrode ◽  
The Impact

The effect of welding parameters (current, electrode diameter) on the impact of low carbon steel specimens was investigated in this work. Two different geometries namely square butt welded joint and double V welded joint were created. The welding operation was carried out at three different current for welding currents of 90, 110 and 130 amps and electrode diameters of 2.5, 3.2 and 4mm respectively. A Charpy impact testing machine was used to evaluate the impact of the welded samples. It was observed that a low current of 90 Amps for all the welding electrode diameters produced high impact values for both the welding geometries. Also, the 3.2 mm electrode diameter was found to be more suitable for welding the square butt and the double V geometry as it yielded higher impact values. Additionally, the double V geometry showed better performance when compared to the square butt geometry for all the combinations of welding currents and electrode diameters.

An anomaly of the temperature dependence of the impact strength of low-carbon steel with an ultrafine-grain structure

2016 ◽  
Vol 61 (1) ◽  
pp. 15-18 ◽  
Author(s):  
I. M. Safarov ◽  
A. V. Korznikov ◽  
R. M. Galeyev ◽  
S. N. Sergeev ◽  
S. V. Gladkovsky ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Impact Strength ◽  
Temperature Dependence ◽  
Low Carbon Steel ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Low Carbon ◽  
Ultrafine Grain Structure ◽  
The Impact

Evaluation of Abrasive Wear Resistance of Fe-Cr-C Hardfacing Alloys Deposited on Active Components of the Agricultural Components

2014 ◽  
Vol 1029 ◽  
pp. 188-193
Author(s):  
Ramona Monica Dobra ◽  
Nicolae Farbas ◽  
Doru Romulus Pascu
Keyword(s):  
Abrasive Wear ◽  
Low Carbon Steel ◽  
Base Material ◽  
Surface Characteristics ◽  
Wear Testing ◽  
Wear Behaviour ◽  
Welding Parameters ◽  
Low Carbon ◽  
Active Components ◽  
Abrasive Wear Behaviour

In most of the engineering applications, such as mining, agriculture, metallurgy, the equipments fail due to abrasive wear. Hardfacing is one of the most economical and most widely used methods of improving surface characteristics of engineering equipments (wear, corrosion) without changing the bulk properties of the components.Fe-Cr-C hardfacing alloys are well known for their excellent performances under severe wear conditions. The wear behaviour of hardfacing alloys depends on their chemical composition, on the microstructure obtained after welding, of the welding technology, respectively the welding parameters which strongly influence, for example, the dilution with the base material or formation of precipitated hard phases.The aim of this study was to characterize the microstructure of Fe-Cr-C hardfacing alloys and to investigate their abrasive wear behaviour. The research has been carried out using four types of Fe-Cr-C hardfacing alloys (8 12, 16 and 20 % Cr). The alloys were deposited on the low-carbon steel S355 JR by manual arc welding method. The abrasion wear testing was carried out using the Taber Rotary Abraser Equipment. The microstructure characterization and surface analysis were performed using optical microscopy and HV 10 hardness tests.

scholarly journals EFFECT OF WELDING PROCESS PARAMETERS ON TENSILE OF LOW CARBON STEEL 283 G.C

2022 ◽  
Vol 26 (1) ◽  
pp. 79-86
Author(s):  
Hussain Hayyal ◽  
◽  
Nadhim M. Faleh ◽  
Keyword(s):  
Carbon Steel ◽  
Tensile Stress ◽  
Welded Joints ◽  
Arc Welding ◽  
Low Carbon Steel ◽  
Base Material ◽  
Welding Process ◽  
Welding Current ◽  
Low Carbon ◽  
Tungsten Electrode

In this study, three welding methods are used. The purpose to investigation the effects of SMAW, SAW, and gas tungsten arc welding (GTAW) on the tensile stress of low carbon steel conforming to ASTM 283 c. 8mm thick plates are used as base material for butt welded joints. The tensile properties of the welded joints were evaluated and the results were compared by experts using the Taguchi method to design three levels of each parameter (current, voltage and displacement speed). From this research, it is found that compared to metal shielded arc welding and submerged arc welding, the pulling effect of the gas shielded welding joint of the tungsten electrode is the best. This is mainly due to the presence of The results of using analysis of variance (ANOVA) to estimate important parameters show that welding current and speed of the weld have a significant effect on tensile stress .the experimental results are in agreement with predicted results, and the maximum error is 3%..

scholarly journals Characterization of Dissimilar Al-Cu BFSW Welds; Interfacial Microstructure, Flow Mechanism and Intermetallics Formation

2020 ◽  
Vol 20 (3) ◽  
pp. 52-78
Author(s):  
A. Tamadon ◽  
M. Abdali ◽  
D. J. Pons ◽  
D. Clucas
Keyword(s):  
Solid Phase ◽  
Pure Copper ◽  
Weld Line ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Optical Microscope ◽  
Interfacial Microstructure ◽  
Welding Parameters ◽  
Friction Stir ◽  
The Impact

AbstractThe purpose of this study is to elucidate the flow features of the dissimilar Al-Cu welded plates. The welding method used is Bobbin Friction Stir Welding (BFSW), and the joint is between two dissimilar materials, aluminium alloy (AA6082-T6) and pure copper. Weld samples were cut from along the weld line, and the cross-sections were polished and observed under an optical microscope (OM). Particular regions of interest were examined under a scanning electron microscope (SEM) and analysed with Energy Dispersive X-ray Spectroscopy (EDS) using the AZtec software from Oxford Instruments. The results and images attained were compared to other similar studies. The reason for fracture was mainly attributed to the welding parameters used; a higher rotational speed may be required to achieve a successful BFSW between these two materials. The impact of welding parameters on the Al-Cu flow bonding and evolution of the intermetallic compounds were identified by studying the interfacial microstructure at the location of the tool action. The work makes an original contribution to identifying the solid-phase hybrid bonding in Al-Cu joints to improve the understanding of the flow behaviours during the BFSW welding process. The microstructural evolution of the dissimilar weld has made it possible to develop a physical model proposed for the flow failure mechanism.

scholarly journals Effect of Ultrasonic Peening on Impact Strength of Low Carbon Steel AISI 1020

2019 ◽  
Vol 54 (6) ◽  
Author(s):  
Jenan Mohammed Naje ◽  
Nidaa Hameed Dawood ◽  
Sara Saad Ghazi
Keyword(s):  
Residual Stress ◽  
Carbon Steel ◽  
Impact Strength ◽  
Residual Stresses ◽  
Base Metal ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Ultrasonic Peening ◽  
Steel Aisi ◽  
The Impact

This paper explores the effect of ultrasonic peening using various passes on an impact strength of AISI 1020 low carbon steel. Many ASTM E23 impact specimens were prepared from the chosen metal and exposed to multi-pass ultrasonic peening (1,2,3 pass). Microstructure, hardness, residual stresses, and impact tests on ultrasonic peened and not peened samples were performed. Ultrasonic peening contributed to increasing the impact strength, due to the increase in comparative residual stress and hardness. Three passes show improvement in strength by (29.7%), comparative with the base metal.

scholarly journals Distortion and Mechanical Characteristics of Single-V and Single Bevel Welded Low Carbon Steel

2020 ◽  
Vol 9 (3) ◽  
pp. 704-713
Keyword(s):  
Base Metal ◽  
Room Temperature ◽  
Mechanical Characteristics ◽  
Low Carbon Steel ◽  
Base Material ◽  
Welding Process ◽  
Low Carbon ◽  
Molten Material ◽  
Distinct Process ◽  
Lower Temperature

Welding is a fabrication or sculptural process that joints the materials, usually metals or thermoplastics, by inducing fusion. It is as distinct process from lower temperature metal-joining techniques such as brazing and soldering, to high temperature welding process and this process keep the base metal from melted. In addition, to melt the base metal, a filler material is typically added to the joint to form a pool of molten material that cools at room temperature, forming a joint that is usually stronger than the base material. Pressure may also be used along with heat, or by itself, to produce a weldment. The current study presents the effects of distortion that occurred in single-V and single bevel welded mild steel. It also includes the macro and microstructure analysis, mechanical properties and also the consumable usage along the time needed to complete the bevel and welding process. As a result, single- V is way more safe and reliable to use to withhold large load compare to single bevel.In term of financial, single bevel way more ahead.

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