scholarly journals Effect of TIG and FSW Welding Processes on Mechanical Properties of Al-4.2Mg-0.6Mn-0.4Sc-0.1Zr Alloy

2021 ◽  
Vol 71 (2) ◽  
pp. 299-304
Author(s):  
Srinivasa Rao Mallipudi ◽  
Tangudu Sai Shankar ◽  
Perumalla Srikar ◽  
Uppda Bhanoji Rao ◽  
Yandra Chandrasekhar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Bending Strength ◽  
Welded Joint ◽  
Testing Machine ◽  
Base Material ◽  
Material Strength ◽  
Test Machine ◽  
Friction Stir ◽  
Welding Processes

Abstract In this study, friction stir welding (FSW) and Tungsten gas welding (TIG) processes were used to weld 5 mm thick Al-4.2Mg-0.6Mn-0.4Sc-0.1Zr alloy plates. The FSwelds and TIG welds were tested for mechanical properties (hardness, ultimate tensile strength, bending strength and impact strength) by means of vicker’s hardness machine, universal testing machine and impact test machine respectively. The strength of the base material was higher, compared to the strength of the FSW and TIG welded joints. The strength of the TIG welded joint decreased, compared to the strength of the FSW welded joint. The microstructure features were also observed for base material with the aid of metallurgical microscope and compared the same with the microstructures of FSW and TIG welded joints. FSW change the material strength due to fine-grain refinement in the stir zone in Al-4.2Mg-0.6Mn-0.4Sc-0.1Zr alloy and therefore FS welded joint exhibited 91.6% joint efficiency followed by the TIG welded joint of 69.8%.

Microstructures and Properties of FSW Joints of AZ31B Mg Alloy

2011 ◽  
Vol 291-294 ◽  
pp. 855-859 ◽  
Author(s):  
Si Rong Yu ◽  
Xian Jun Chen
Keyword(s):  
Mechanical Properties ◽  
Heat Affected Zone ◽  
Welded Joint ◽  
Base Material ◽  
Alloy Sheet ◽  
Weld Nugget ◽  
Mg Alloy ◽  
Material Strength ◽  
Nugget Zone ◽  
Friction Stir

The extruded AZ31B Mg alloy sheet was welded with friction stir welding. The microstructures and mechanical properties of the welded joint were investigated. The results show that the grains in the weld nugget zone were small, uniform and equiaxed. The grains in thermo-mechanical affected zone were stretched and relatively small, but were not as small and uniform as those in the weld nugget zone. The grains in the heat-affected zone were relatively coarse. The fracture of the welded joint occurred mainly in the heat affected zone. The tensile strength of the welded joints was up to 257.4 MPa and was 87.9% of the base material strength. The microhardness in the weld nugget zone was higher. The microhardness in the thermo-mechanical affected zone and heat affected zone were lower than that in the weld nugget zone. The microhardness in the weld nugget zone increased from the upper surface to the bottom.

Evaluating the Strength of the Friction Stir Welded Joints at Various Rotational Speeds

2013 ◽  
Vol 446-447 ◽  
pp. 312-315
Author(s):  
Ramaraju Ramgopal Varma ◽  
Abdullah Bin Ibrahim ◽  
B. Ravinder Reddy
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Yield Strength ◽  
Welded Joints ◽  
Rotational Speed ◽  
Testing Machine ◽  
Friction Stir ◽  
Universal Testing ◽  
Welding Technique

The present research paper aims in evaluating the strength of the welded AA6351 alloy plates of 6 mm thick by using friction stir welding technique at different rotational speeds The applied welding technique is capable of achieving the mechanical properties of the alloy close to that of the original alloy. In the present investigation, the speeds of the spindle were varied from 1100 rpm to 1500 rpm with a constant transverse speed of 20 mm/min. The tensile strength of the joints is determined by an universal testing machine. The results from the present investigation show that the values of the yield strength were very much closer to the values of the AA6351Alloy prior to welding. It has been found from the experiments that the strength of the joints increases with the increase in the rotational speed; however, the same is decreasing after achieving certain speed.

Effect of Tool Parameters on Mechanical Properties of Friction Stir Welded Aluminum Alloy

2015 ◽  
Vol 786 ◽  
pp. 111-115 ◽  
Author(s):  
Srinivasa Rao Pedapati ◽  
G. Vimalan ◽  
Mokhtar Awang ◽  
A.M.A. Rani
Keyword(s):  
Mechanical Properties ◽  
Rotational Speed ◽  
Base Material ◽  
Hardness Test ◽  
Tensile Tests ◽  
Tool Geometry ◽  
Welding Parameters ◽  
Material Strength ◽  
Friction Stir ◽  
Tool Profiles

The mechanical properties of weld joints in Friction Stir Welding (FSW) are influenced by the welding parameters such as rotational speed, tool geometry and welding speed. In the present study, three different tool profiles have been used to weld the joints with three different rotational speed and two welding speeds. Full factorial experiments have been conducted using DoE. The mechanical properties of weld joint were evaluated by means of tensile tests and hardness test at room temperature. The experiment result shows that the average highest number of hardness was 40.06 HRB with square tool at a rotational speed of 2000rpm while lowest hardness was 30.84 HRB with cylindrical threaded tool at rotational speed of 1800rpm. The maximum tensile strength of the joint obtained is 265 M Pa which is close to base material strength. It is observed from experimental results that joints made by square tool yield more strength compared to other tool profiles.

Influence of Friction Stir Welding Parameters on the Mechanical Properties of EN AW-7075 Weld Joints

2016 ◽  
Vol 835 ◽  
pp. 210-215
Author(s):  
Máté Nagy ◽  
Mária Behúlová
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Ultimate Strength ◽  
Base Material ◽  
High Strength ◽  
Welding Parameters ◽  
Micro Hardness ◽  
Friction Stir ◽  
Weld Joints ◽  
Welding Processes

The paper deals with the friction stir welding (FSW) of the high strength EN AW 7075-T651 aluminium alloy with the aim to analyze the influence of welding parameters on the mechanical properties of Al-weld joints. FSW represents relatively novel solid-state technology of material joining which can be successfully applied for welding of several metallic alloys including the high-strength aluminium alloys that are hard to weld by conventional fusion welding processes. In cooperation with VÚZ - PI SR Bratislava, nine experimental weld joints of samples with dimensions of 300 × 150 × 10 mm were prepared using the welding machine of the FSW-LM-060 type and different parameters of welding – the welding speed from 60 to 120 mm/min and the tool rotation rate from 600 to 1000 rpm in clockwise direction. The quality of weld joints was evaluated by static tensile tests and micro-hardness measurements. According to obtained results of tensile testing, the average values of ultimate strength of weld joints are by 32.2 % lower comparing with the ultimate strength of the base material. On the other hand, the ductility increased by 7.2 %. The highest micro-hardness of weld joints at the level of 129 HV was measured in thermo-mechanically affected zone on the retreating side.

Behaviour of AlMg3 Base Material and its Friction Stir Welded Joints under Cyclic Loading Conditions

2015 ◽  
Vol 812 ◽  
pp. 155-160
Author(s):  
János Lukács ◽  
Ákos Meilinger
Keyword(s):  
Cyclic Loading ◽  
Welded Joints ◽  
Research Work ◽  
Base Material ◽  
Loading Conditions ◽  
Step Method ◽  
Staircase Method ◽  
Friction Stir ◽  
Important Direction ◽  
Welding Processes

The friction stir welding (FSW) is a dynamically developing version of the pressure welding processes. Nowadays, the knowing of the properties and the behaviour of the welded joints is an important direction of the investigations, especially under cyclic loading. The research work aimed (i) to demonstrate the behaviour of the FSW welded joints under cyclic loading conditions; (ii) to confirm the applicability of the used friction welding technology. Experiments were performed on 5754-H22 aluminium alloy and its welded joints; both high cycle fatigue (HCF) and fatigue crack propagation (FCG) tests were executed. HCF limit curves were determined based on staircase method. Statistical behaviour of the base material and the welded joints under FCG was represented by the cutting of the specimens, in other words by the using of different crack paths. FCG limit curves can be determined by own developed six step method. The investigations and their results were compared with each other and with the results can be found in the literature.

scholarly journals Structural Aspects of Execution and Thermal Treatment of Welded Joints of Hardox Extreme Steel

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 915 ◽  
Author(s):  
Konat
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Welded Joints ◽  
Base Material ◽  
Steel Structures ◽  
High Strength ◽  
Carbon Equivalent ◽  
Material Structure ◽  
Welding Processes ◽  
Structural Aspects

The paper presents structure and mechanical properties of welded joints of the high-strength, abrasive-wear resistant steel Hardox Extreme. It was shown that, as a result of welding this steel, structures conducive to lowering its abrasion-wear resistance are created in the heat-affected zone. Width of the zone exceeds 60 mm, which results in accelerated wear in the planned applications. On the grounds of the carried-out examinations of structures and selected mechanical properties, a welding technology followed by heat treatment of heat-affected zones was suggested, leading to reconstruction of HAZ structures that is morphologically close to the base material structure. In spite of high carbon equivalent (CEV) of Hardox Extreme, the executed welding processes and heat treatment did not result in the appearance, in laboratory conditions, of welding imperfections in the welded joints.

scholarly journals Experimental Comparison of the MIG and Friction Stir Welding Processes for AA 6005 Aluminium Alloy

2015 ◽  
Vol 651-653 ◽  
pp. 1480-1486 ◽  
Author(s):  
Serafino Caruso ◽  
Davide Campanella ◽  
Sebastiano Candamano ◽  
Claudia Varrese ◽  
Fortunato Crea ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Welded Joints ◽  
Bending Strength ◽  
Experimental Comparison ◽  
Friction Stir Weld ◽  
Process Conditions ◽  
Al Alloy ◽  
Friction Stir ◽  
Advantages And Disadvantages ◽  
Welding Processes

In this study, the mechanical properties of welded joints of AA 6005 aluminum alloy obtained with friction stir welding (FSW) and conventional metal inert gas welding (MIG) are studied. FSW welds were carried out on a semi-automatic milling machine. The performance of FSW and MIG welded joints were identified using tensile and bending impact tests, as far as the environmental aspects are also included in the discussion. The joints obtained with FSW and MIG processes were also investigated in their microstructure. The results indicate that, the microstructure of the friction stir weld is different from that of MIG welded joint. The weld nugget consists of small grains in FSW than those found in MIG weld. Taking into consideration the process conditions and requirements, FSW and MIG processes were also compared with each other to understand the advantages and disadvantages of the processes for welding applications of studied Al alloy. Better tensile and bending strength were obtained with FSW welded joints.

scholarly journals Mechanical Properties and Microstructural Characterization of Dissimilar Friction Stir Welded AA5083 and AA6061 Aluminium Alloys

Mechanika ◽  
2020 ◽  
Vol 26 (6) ◽  
pp. 545-552
Author(s):  
Sasi Lakshmikhanth RAJASEELAN ◽  
Subbaiah KUMARASAMY
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Welded Joints ◽  
Aluminium Alloys ◽  
Microstructural Analysis ◽  
Testing Machine ◽  
Welding Process ◽  
Fusion Welding ◽  
Friction Stir

Solidification is one of the major issues that was faced during the fusion welding of dissimilar non-heat treatable and heat treatable aluminium alloys. To overcome this issue Friction Stir Welding played a very vital role, since it is a solid state welding process. In the current study, dissimilar friction stir welding was carried out between non heat-treatable aluminium alloy AA5083-H111 and heat-treatable aluminium alloy AA6061-T6. The microstructural analysis and the mechanical properties of the dissimilar friction stir welded aluminium alloy AA5083-H111 and AA6061-T6 have been investigated. Both optical microscopy and scanning electron microscopy was used to evaluate the microstructural features. The elemental analysis was carried out using SEM-EDX. The tensile properties are studied using Universal Testing Machine. Hardness at various zones of the welded joints was measured using Vicker’s Hardness Testing Machine. The mechanical properties of the friction stir welded joints were correlated with the microstructure of the dissimilar welded joints.

Effect of Process Parameters and Tool Coating on Mechanical Properties and Microstructure of Heat Assisted Friction Stir Welded Polyethylene Sheets

2012 ◽  
Vol 445 ◽  
pp. 765-770 ◽  
Author(s):  
Ehsan Azarsa ◽  
Amir Mostafapour Asl ◽  
Vahid Tavakolkhah
Keyword(s):  
High Efficiency ◽  
Base Material ◽  
Cost Effective ◽  
Material Strength ◽  
High Productivity ◽  
Friction Stir ◽  
External Heating ◽  
Engineering Plastics ◽  
Welding Processes ◽  
Mechanical Movement

With the increasing growth of engineering plastics, the demand for reliable, rapid, high productivity and cost effective joining methods (similar to those used in the case of metals) is an undeniable requirement [. Furthermore, the need to produce larger and more complex parts from polymers has created an increased demand for joining, particularly in thermoplastic materials. In the case of creating a joint with high efficiency (the ratio of joint strength to base material strength) between currently available joining methods, welding is the best option [2,3]. Plastic welding processes can be divided into two groups: (1) Processes involving mechanical movement to produce heating (ultrasonic welding, friction welding, vibration welding) (2) processes involving external heating (hot plate welding, hot gas welding and resistive and implant welding) [. The welding method presented in this study utilizes both mechanical movement and external heating to produce heat.

scholarly journals Effect of Applied Pressure on the Mechanical Properties of 6061 Aluminum Alloy Welded Joints Prepared by Friction Stir Welding

2017 ◽  
Vol 7 (3) ◽  
pp. 1619-1622
Author(s):  
J. A. Al-jarrah ◽  
A. Ibrahim ◽  
S. Sawlaha
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Axial Force ◽  
Welded Joints ◽  
Applied Pressure ◽  
Base Material ◽  
Surface Appearance ◽  
6061 Aluminum Alloy ◽  
Friction Stir

This paper investigates the effect of axial force on the surface appearance and mechanical properties of 6061 aluminum alloy welded joints prepared by friction stir welding. The applied pressure varies from 1.44 to 10.07 MPa. The applied pressure was calculated from the axial force which exerted by a spring loaded cell designed for this purpose. Defect free joints obtained at an applied pressure of 3.62 MPa. The mechanical properties of the welded joints were evaluated through microhardness and tensile tests at room temperature. From this investigation, it was found that the joint produced with an applied pressure of 5.76 MPa exhibits superior tensile strength compared to other welded joints. The fracture of this joint happened at the base material.

Sign in / Sign up

Export Citation Format

Share Document