scholarly journals Effect of Carbonitriding on Tribomechanical and Corrosion-Resistant Properties of Friction Stir Welded Aluminium 2024 Alloy

2021 ◽  
Vol 71 (2) ◽  
pp. 199-212
Author(s):  
Priya ◽  
Gupta Manoj Kumar ◽  
Patel Vinay Kumar
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Impact Strength ◽  
Aluminium Alloy ◽  
Corrosion Resistant ◽  
Friction Stir ◽  
2024 Alloy ◽  
Pre Treatment ◽  
The Sacrifice ◽  
Al 2024

Abstract Friction stir welding (FSW) is extensively used to join aluminium alloys components in space and aircraft industries. Al 2024 is a heat-treatable aluminium alloy with copper as the primary alloying element which has good strength and fatigue resistance. This paper investigates the effect of carbonitriding surface modification on the hardness, tensile strength and impact strength of FSW welded Al 2024 joints. The friction stir welding was performed on three different sets of aluminium alloy (Al2024:Al2024, Al2024: carbonitrided-Al2024, carbonitrided-Al2024: carbonitrided-Al2024) at two different tool rotation speed (TRS) and two welding speed using cylindrical pin tool. The carbonitriding pre-treatment of Al-2024 alloy demonstrated significant improvement in the tensile strength, percentage elongation, abrasion wear resistance and corrosion resistance with the sacrifice of impact strength. The maximum tensile strength of all three sets of samples after FSW was recorded in descending order of (i) carbonitrided-Al2024:carbonitrided-Al2024 (ii) Al2024:Carbonitrided-Al2024 and (iii) Al2024:Al2024. The friction stir welded joint of carbonitrided aluminium alloy exhibited best abrasive wear resistant and corrosion resistant properties.

Considerations on the Ultimate Tensile Strength of Butt Welds of the EN AW 5754 Aluminium Alloy, Made by Friction Stir Welding (FSW)

2020 ◽  
Vol 1157 ◽  
pp. 38-46
Author(s):  
Victor Verbiţchi ◽  
Radu Cojocaru ◽  
Lia Nicoleta Boțilă ◽  
Cristian Ciucă ◽  
Ion Aurel Perianu
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Ultimate Tensile Strength ◽  
Tensile Test ◽  
Aluminium Alloy ◽  
Hazardous Substances ◽  
Parent Metal ◽  
Friction Stir ◽  
Test Pieces ◽  
Fsw Parameters

Experiments have been performed for the butt welding of 160 mm x 90 mm x 2 mm sheets of EN AW 5754 aluminium alloy, where the friction stir welding (FSW) has been used.Referring to the parent metal, the chemical composition and the form of wrought products of the aluminium alloy EN AW 5754 is presented, according to the standard EN 573-1:2005, respectively EN 573-3:2013. The mechanical properties of EN AW-5754 (Al Mg3) sheets are presented, according to EN 485-2:2016. The experiments have been conducted on the own equipment for friction stir welding, type FSW-4kW-10kN, to execute 8 (eight) FSW test pieces, according to EN ISO 25239-4. A quenched FSW tool, own-made of C 45 grade steel, EN 10083, has been used. The parameters of the FSW tests are shown. As main parameters, the rotational speed of the FSW tool was in the range n = 800 – 1200 rev/min, respectively the travel speed was in the range v = 50 – 200 mm/min. The run of the joining experiments is described and the joining test pieces are presented in figures. The ultimate tensile strength of the parent metal (σmin,pm) is based on the specified minimum tensile strength of the ”O” condition of the parent material, respectively this value is also required for the weld, that is σmin,w = 190 MPa. The specimens T1.0, T1.1, T2.1, T2.2, T3.1, T3.2, T4.1, T4.2, T5.1, T5.2 și T6.1 are adequate and accepted by this tensile test. The specimens T1.2, T6.2, T7.1, T72. and T8.1 can be accepted, if higher properties are achieved with a full postweld treatment. Another possibility is a lower extent of the minimum tensile strength of the weld that shall be in accordance with another design specification, for example σmin,w = 145 MPa. By the correlation of the FSW parameters with the results of the tensile test, the ranges for the main parameters with adequate values of the ultimate tensile strength are established: n = 800 – 1000 rev/min and v = 50 – 100 mm/min. By the conclusions, the main aspects of the execution of the FSW test pieces, as well as the results of the tensile tests are selected. The involved industrial areas of the applications are: electro-technique, electronics, manufacturing, shipbuilding and automotive industries. The FSW process is ecological, because it neither uses, nor produces hazardous substances. The references consist of 12 titles.

Experimental investigation and optimization of quality characteristics during friction stir welding of Al- and Zn-based magnesium alloy using artificial intelligence

2021 ◽  
pp. 146442072110448
Author(s):  
Pradeep K Yadav ◽  
Manoj K Khurana
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Magnesium Alloy ◽  
Impact Strength ◽  
Optimization Technique ◽  
Absolute Error ◽  
Statistical Parameters ◽  
Percentage Elongation ◽  
Friction Stir

Friction stir welding is successfully used to weld different wrought magnesium alloys. This work investigated the mechanical and microstructural behavior of the friction stir-welded AZ31B magnesium alloy. The experiments were conducted as per experimental runs designed by response surface methodology. An artificial neural network model was developed to produce a relationship between process variables (tool rotational speed, welding speed, and tool shoulder diameter) and characteristics of the friction stir-welded joints (tensile strength, percentage elongation, impact strength, microhardness, and grain size). The acceptable range of statistical parameters validated the adequacy of the model. The multi-objective optimization technique, genetic algorithm was used to obtain a set of Pareto optimal solutions. The best-compromised optimum solution for maximum tensile strength (164.2 MPa), percentage elongation (8%) impact strength (3.5 J), microhardness (85 Hv), and minimum grain size (13.1 μm) was validated by confirmation test with <3 percent absolute error percentage. The fractographical analysis has been performed and dimples and torn edges observed in fracture zones.

scholarly journals Parameters Optimization of Dissimilar Friction Stir Welding for AA7079 and AA8050 through RSM

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
M. Kavitha ◽  
V. M. Manickavasagam ◽  
T. Sathish ◽  
Bhiksha Gugulothu ◽  
A. Sathish Kumar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Engineering Application ◽  
Parameters Optimization ◽  
Friction Stir ◽  
Tool Shoulder ◽  
Dissimilar Friction Stir Welding ◽  
Constituent Elements ◽  
Tool Pin

Aluminium alloy is widely used in engineering application, and it can be classified based on the constituent elements or alloying elements. Aluminium alloy is preferred for the nature of its tensile strength, ductility, and corrosion resistance in this research to make a dissimilar friction stir welding joint of aluminium alloys 7079 and 8050 materials. The tensile strength of the weld joint is estimated by the influence of the response surface methodology approach. The welding is carried out by preferred process parameters with a tool speed of 1000–2500 rpm, tool pin diameter of 2–6 mm, welding speed of 50–300 mm/min, and tool shoulder diameter of 10–20 mm. The ANOVA analysis and the prediction of tensile strength were conducted efficiently. From the RSM analysis, the tool pin diameter mostly modified the output of the result.

Optimization and Mechanical Characterization of AA5083 and AA7075 Dissimilar Aluminium Alloy Joints Produced by Friction Stir Welding

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
S. Rajeshkannan ◽  
M. Vigneshkumar ◽  
V. Gopal ◽  
S. Ramesh
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Axial Force ◽  
Welding Speed ◽  
Rotational Speed ◽  
Frictional Heat ◽  
Friction Stir ◽  
Welding Method ◽  
The Impact

In this research work the aluminium alloys including AA7075 and AA5083 are combined with friction stir welding method. This contrasts with factors such as alloy segregation, hot cracking and porosity which result from fusion welding process in the welded area. In order to generate high quality joint of aluminium alloy, friction-stir welding (FSW) an assuring welding method is followed. To achieve the determined strength, an entire control over the relevant process is needed to increase the tensile vitality. The welding factors like welding speed (WS), axial force (AF) and rotational speed (RS) are examined for optimisation. In order to measure the impact of the factors on tensile strength of FS welded joints, Taguchi L9 orthogonal array technique is employed. The amount of involvement of these factors on weld quality is determined by means of analysis of variance (ANOVA). The utmost ultimate tensile strength (UTS) attained for AA7075 and AA5083 joint is 256MPa. ANOVA results show that the quality-wise effectiveness of the weld as welding speed (5.48percent), axial force (15.18percent), then the rotational speed (79.32percent). This is due to the presence of fine equiaxed grains in the microstructures of the stir zones at different FS welding circumstances. However, a decrease in the grain size of the process zone is observed when the frictional heat flow is decreased while friction-stir welding.

Effect of Friction Stir Welding Mode and its Direction Relative to the Rolling Direction of 2024 Alloy on the Structure and Mechanical Properties of its Weld Joints

2020 ◽  
Vol 22 (4) ◽  
pp. 110-123
Author(s):  
Alexey Ivanov ◽  
◽  
Valery Rubtsov ◽  
Evgeny Kolubaev ◽  
Vladimir Bakshaev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Base Metal ◽  
Welding Condition ◽  
Friction Stir ◽  
Weld Joints ◽  
2024 Alloy ◽  
Resistance To Deformation ◽  
Welding Force

Introduction. Friction stir welding conditions determines character of thermomechanical impact on welded material, so a critical alteration of even one of condition parameters can result in formation of defects and strength decrease of welded joint. Also an important factor is an orientation of welded material relative to a welding direction since it determines kinetics of material deformation and consequently its final structure and properties. Research efforts of friction stir welding properties generally consist in analysis of final properties of obtained weld joints and its correlation with parameters of welding condition. But to solve a problem of obtaining of weld joints with strength and quality, it’s also important to estimate a welded material resistance to deformation from welding tool impact which could be achieved by monitoring a number of parameters directly in process of welding. The purpose of the work is to research an impact of welding condition parameters and an orientation of welded material’s structure on friction stir welding process behavior and also on structure and strength of weld joints of 2024 aluminum alloy. Results and discussion. By monitoring the torque and welding force, it is shown that as the tool penetration force increases, the material's resistance to deformation increases. When welding is longitudinal to the direction of base metal rolling a torque and a welding force parameters decreases in value of 5-20%. An increase of welding speed provides a growing of material resistance to welding tool movement, at that, a direction of welding doesn’t have a significant impact. With an increase of welding tool rotational speed, a material resistance to deformation decreases, a welding temperature grows and it results in growing of material’s plasticization degree and in improvement of its mass transfer conditions. It is also shown that the welding conditions, which allows welding the 2024 alloy at a temperature of 450 – 500 ºС, provides the degree of plasticization of the material, at which welded joints with a high-quality structure and high mechanical properties are obtained. In this conditions a direction of welding in relation to the direction of base metal rolling has an impact: when welding is longitudinal to the direction of rolling the tensile strength of weld joints reaches a value of 92%, and when welding is transverse - 95% of base material tensile strength.

scholarly journals Mechanical behaviour of Al 2024 alloy welded by friction stir welding

2018 ◽  
Vol 393 ◽  
pp. 012107
Author(s):  
M Milčić ◽  
T Vuherer ◽  
I Radisavljević ◽  
D Milčić ◽  
J Kramberger ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Mechanical Behaviour ◽  
Friction Stir ◽  
2024 Alloy ◽  
Al 2024
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