scholarly journals Similar and dissimilar welding effect on the mechanical properties of 5383 H34, 5754 H34 and 6005 T6 aluminum alloys

2020 ◽  
Vol 25 (2) ◽  
Author(s):  
Christian Caglioni ◽  
Felipe Mello Rigon ◽  
, Marcelo André Losekann ◽  
Luciana Cristina Soto Herek Rezende ◽  
Mychelle Vianna Pereira Companhoni ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Specific Weight ◽  
Morphological Properties ◽  
Dissimilar Welding ◽  
Mechanical Resistance ◽  
Micro Hardness ◽  
Precipitate Dissolution ◽  
Hardness Tests ◽  
Mechanical Tensile

ABSTRACT Aluminum alloys are not covered by their specific weight. Each class of aluminum alloy presents a set of properties that are favorable to a given function in the same product, just as the alloys may be present in the same vehicle. However, it is necessary to know the changes in the mechanical properties that occur with the union process of these aluminum alloys. The objective of this study was to evaluate the mechanical and morphological properties of alloys 5383 H34, 5754 H34 and 6005 T6 similarly welded and dissimilar by the MIG process. Six combinations of these alloys were characterized by mechanical tensile, folding and Vickers micro-hardness tests, as well as scanning electron microscopy (SEM) and optical microscopy (OM). Among the results obtained, a decrease in tensile strength was observed for all welded alloys. In addition, the microhardness was affected in the melt line, in the weld bead and in the HAZ (heat affected zone). The main causes of the reduction of the mechanical resistance of the welded alloys were the grain growth and the precipitate dissolution. The data obtained in this study contribute in a very positive way to the development and dimensioning of new projects and technologies involving aluminum alloys.

Influence of Melt Temperature on Compressive Plasticity of a Cu-Zr-Al Bulk Metallic Glass

2010 ◽  
Vol 146-147 ◽  
pp. 517-521
Author(s):  
Sheng Hui Xie ◽  
Xie Rong Zeng ◽  
Dong Ju Fu ◽  
Lei Zhao ◽  
Qiang Hu
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Metallic Glasses ◽  
Mechanical Performance ◽  
Casting Temperature ◽  
Thermal And Mechanical Properties ◽  
Micro Hardness ◽  
Melt Temperature ◽  
Hardness Tests ◽  
Important Solution

Cu47.5Zr47.5Al5 bulk metallic glasses (BMGs) were cast from the melt temperature 1143 to 1373 K. The structure, thermal and mechanical properties of the BMGs were investigated by XRD, DSC, HRTEM, dilatometric measurements, micro-hardness tests and uniaxial compression. The results indicate that the microstructure and mechanical performance of BMGs are closely affected by the casting temperature. Proper casting temperature ensures the BMGs with large relaxed excess free volume (REFV) and nano-crystallites, which favor the plastic deformation in Cu47.5Zr47.5Al5 BMGs. Regulating the preparing parameters is an important solution to good plasticity in BMGs.

Effects of Various Thermal and Environmental Exposure on the Mechanical Properties of Aluminum Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 319-324
Author(s):  
E.W. Lee ◽  
O.S. Es-Said
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Tensile Properties ◽  
Environmental Exposure ◽  
Thermal Exposure ◽  
Age Hardening ◽  
Conductivity Measurements ◽  
Heat Damage ◽  
Quenching Media ◽  
Mechanical Tensile

Aluminum alloys 6061-T6, 7075-T6 and 7249-T76 were subjected to several combinations of solution treatments, quenching media, and age hardening treatments to correlate their mechanical tensile properties to hardness and conductivity measurements. Additionally, the 6061-T6 and 7075- T6 alloys were thermally exposed to several temperatures to simulate heat damage effects. The thermal exposure was correlated to the tensile properties and hardness and conductivity measurements.

Effect of Welding Speed on CO2 Laser Beam Welded Aluminum-Magnesium Alloy 5083 in H321 Condition

2013 ◽  
Vol 685 ◽  
pp. 259-263 ◽  
Author(s):  
K. Subbaiah ◽  
Geetha Manivasagam ◽  
B. Shanmugarajan ◽  
S.R. Koteswara Rao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Laser Beam ◽  
Welding Speed ◽  
Welded Joint ◽  
Laser Beam Welding ◽  
Tensile Tests ◽  
Micro Hardness ◽  
Microstructural Characteristics ◽  
Hardness Tests

Laser beam welding of aluminum alloys is expected to offer good mechanical properties of welded joints. In this experimental work reported, CO2 laser beam welding at 3.5 kW incident power was conducted autogenously on 5 mm thick 5083-H321 aluminum alloy plates at different welding speeds. The mechanical properties and microstructural characteristics of the welds are evaluated through tensile tests, micro-hardness tests, optical microscopy and scanning electron microscopy (SEM). Both yield stress and tensile strength of the laser beam welded joint at the optimum welding speed were 88 % of base metal values. Experimental results indicate that the tensile strength and hardness of laser beam welds are affected by the variation of the intermetallic compounds.

Effect of Nd on the Microstructure and Mechanical Properties of High Aluminum Zinc-Based Alloy

2011 ◽  
Vol 391-392 ◽  
pp. 564-568
Author(s):  
Ai Li Wei ◽  
Kun Yu Zhang ◽  
Xian Rong Li ◽  
Wei Liang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperatures ◽  
Grain Refining ◽  
Micro Hardness ◽  
Microstructure And Mechanical Properties ◽  
Hardness Tests ◽  
And Performance ◽  
Microstructure And Performance ◽  
High Aluminum

This work mainly investigated the influence of element Nd on the microstructure and mechanical properties of the Zn-25Al-5Mg-2.5Si alloys with different Nd contents. The tensile and hardness tests were carried out at room and elevated temperatures. The results show that the addition of element Nd leads to the grain refining and the formation of Al2Nd and NdZn2 phases in the microstructure, and the mechanical properties of the alloys rise at first and then drop with the increasing of Nd content. The optimization of microstructure and performance especially the tensile strength at high temperature is obtained when Nd content is 0.8 wt.%. It can result in increase of tensile strength by 48.8% and micro-hardness by 67.4% at 180。C.

Hybrid Laser – Arc Welding Applied in Longitudinal Joints for Hydrocarbon Conduction Pipes

2015 ◽  
Vol 1766 ◽  
pp. 45-52
Author(s):  
Raúl J. Fernández Tavitas ◽  
Rocío Saldaña Garcés ◽  
Víctor H. López Cortéz
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Arc Welding ◽  
Weld Zone ◽  
Micro Hardness ◽  
Hybrid Laser Arc Welding ◽  
Hardness Tests ◽  
Longitudinal Joints ◽  
Weld Seams ◽  
Pipe Manufacturing

ABSTRACTIn this paper the effect of hybrid laser arc welding on longitudinal joints for pipes of 1.27cm thick is investigated. For the investigation, an API X70 steel was welded with the HLAW process and then subjected to tensile, bending and micro hardness tests under standards for pipe manufacturing. Images of the weld seams were taken to observe the structure and size of the weld zones. Analysis was made by light microscopy to determine the phases present in the weld zones and to observe if there is a variation of grain size in the weld zones that adversely affects the mechanical properties of the API X70 steel. Results show that the mechanical properties of the joints meet the requirements for their use in pipe manufacturing; one reason is the low thickness of the weld zone that barely affects the original properties of API X70 steel. Also the presence of bainite in the microstructure of weld zones provides resistance to the joints.

scholarly journals Investigation of Mechanical Properties of Friction-welded AISI 304 with AISI 430 Dissimilar Steels

2019 ◽  
Vol 1 (3) ◽  
pp. 8
Author(s):  
Anitha P ◽  
Manik ChandraMajumder ◽  
Saravanan V ◽  
Rajakumar S
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Microstructural Analysis ◽  
Welding Process ◽  
Micro Hardness ◽  
High Tensile Strength ◽  
Aisi 304 ◽  
Hardness Tests ◽  
Aisi 430 ◽  
Vickers Micro Hardness

In this paper, standard SS304 austenitic stainless steel and SS430 ferritic steel cylindrical rods were fabricated by friction welding process by varying the frictional pressure and forge pressure in order to understand the effect of process parameter. The tensile strength and Vickers micro hardness tests were conducted for each fabricated joint to evaluate the mechanical properties of the welded specimen. It was found that sample S5 with friction pressure of 90 MPa and forging Pressure of 120 MPa has the high tensile strength value of 637 MPa and 372HV at the interface region. A detailed microstructural analysis was performed at the interface to reveal interconnecting of dissimilar metals.

Experimental Study on Mechanical Properties of Friction Stir Welded Dissimilar Joints of Aluminium Alloys AA8011-AA6082

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
K. Giridharan ◽  
P. Sevvel ◽  
K. Senthilnathan ◽  
S. Muthukumaran ◽  
S. Padmanabhan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Welding Speed ◽  
Rotational Speed ◽  
Aluminium Alloys ◽  
Stir Zone ◽  
Micro Hardness ◽  
Weld Joints ◽  
Hardness Tests ◽  
Joining Process

In this research article, the mechanical properties and microstructure analysis ofFriction Stir Welded (FSW) of dissimilar aluminium alloys AA8011-AA6082 were evaluated. The FSW tool with taper cylindrical shape of H13 steel was selected to fabricate the weld joints between the dissimilar alloys. In this regard, three different rotational speed tools, three welding speeds and an unvarying axial load of 7 kN are used in this investigation. The tool rotational speeds are 800 rpm, 1000 rpm and 1200 rpm. The tool travelling speeds are 25mm/min, 30 mm/min and 35 mm/min. These constraints are used to generate frictional heat and interface into the soft range where the joining process can take place between the two materials. The mechanical tests were carried out on the weld joints. Microstructure analysis, tensile and hardness tests were considered by changing the tool rotating speed, welding speed and maintaining a constant axial force during material joining process. The micro hardness of the FSW weld joints in the stir zone increased to increase the tool rotational speed as well as to maintain a low range of welding speed during material joining process. The micro hardness of the stir zone in the FSW weld joints is increased as to reduce the welding speed. It was found that the highest value of the tensile strength in the joints is made-up of using the taper-shaped tool at 800 rpm, welding speed of 35mm/min and unvarying downward force of 7kN. These identified parameters give sufficient mechanical properties and fewer defects in weld joints such as tensile strength of 68 N and micro hardness of 42 Hv. The tensile and hardness tests values are examined by the part of mechanical characterization and the values are correlated to recognize the superiority of the weld joint.

scholarly journals Friction welding of AISI 304: effect of friction time on micro-structure, micro-hardness and tension-compression properties

2020 ◽  
Vol 26 (3) ◽  
pp. 78-83
Author(s):  
Ammar JABBAR HASSAN ◽  
Taoufik BOUKHAROUBA ◽  
Djamel MIROUD
Keyword(s):  
Mechanical Properties ◽  
Friction Welding ◽  
Deformation Zone ◽  
Standardized Test ◽  
Tensile Fracture ◽  
Effective Diameter ◽  
Direct Drive ◽  
Compression Tests ◽  
Micro Hardness ◽  
Hardness Tests

During direct drive friction welding could relatively predicting the micro-structural and mechanical properties of friction-welded joints by controlling the welding conditions; friction time is an important coefficient that effects on these properties, present study focused on the effect of that time on micro-structural and mechanical phenomena during that process. The process achieved in different friction time, while welding joints investigated by macroscope, microstructure, scanning electron microscope, tensile, compression and micro-hardness tests. The micro-hardness tests were performd along the interface and axial direction. Thus, the tensile tests  carried out on the standardized test piece with effective diameter of 6 mm and compression tests were extracted at welded center in three angles of 0°, 45° and 90° with test specimen of 4 mm diameter and 6.5 mm length. The results showed that with increasing friction time could be found hard zone at the interface of welded joint because of extended of high plastically deformation zone, which will responsible on decreasing some useful mechanical properties such as ultimate tensile strength and yield compression strength. However, tensile fracture position occurred adjacent to the interface at the thermo-mechanical deformation zone in the rotating side for all welding pieces, where the micro-hardness attenuated at that region.

scholarly journals Novel Characterizations of Mechanical Properties for a Copper/Single-Walled Carbon Nanotube Nanocomposite Synthesized by Laser Surface Implanting

2020 ◽  
Vol 6 (1) ◽  
pp. 10
Author(s):  
Jay F. Tu ◽  
Nilesh Rajule ◽  
Sang Don Mun
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Compression Test ◽  
Ion Beam ◽  
Pure Copper ◽  
Laser Surface ◽  
Micro Hardness ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Hardness Tests

In our previous studies, we have developed a wet process, denoted laser surface implanting (LSI), to synthesize a copper/single-walled carbon nanotube (Cu–SWCNT) metal nanocomposite as an implant onto the surface of a pure copper substrate. The nanostructure of this Cu–SWCNT composite was confirmed independently by several methods, including transmission electron microscope (TEM) images, which show discernable SWCNT clusters in nano sizes inside the copper matrix. The hardness was measured by micro-hardness tests to indicate over three times hardness over that of pure copper could be achieved. In this paper, we present several unique ways to further characterize the mechanical properties of the Cu-SWCNT nanocomposite. Nano-hardness tests are first performed to confirm that hardness improvement, about three times that of pure copper, is achieved, consistent with the micro-hardness test results. A new toughness measurement based on focus ion beam (FIB) bombardment was performed to demonstrate 2.5 times toughness improvement. Finally, a new compression test rig was designed to conduct plane strain compression test for an array of Cu-SWCNT implants. The results confirmed that the Cu-SWCNT nanocomposite exhibits a stress-strain behavior consistent with the results of the hardness and FIB tests.

Laser Heat Treatment Effects on Roller Hemming in Aluminum Alloys

2012 ◽  
Vol 504-506 ◽  
pp. 711-716 ◽  
Author(s):  
Tobias Kleeh ◽  
Marion Merklein ◽  
Karl Roll
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloys ◽  
Laser Energy ◽  
Laser System ◽  
Wave Length ◽  
Laser Heat Treatment ◽  
Micro Hardness ◽  
Forming Process ◽  
Hardness Tests ◽  
Set Up

Especially for bending/hemming operations, aluminum alloys lack sufficient formability. The aim is to use them in the same way as other structural materials such as conventional steel. In this study, a combined laser-assisted roller hemming process is set up. For this, a 4000 W Nd:YAG-laser with a wave-length of 1096 nm is used. Several parameters are defined and the effects of heat treatment on the hemming ability of AA6014 were investigated. Taking into account the kinds of components that are expected to be formed, the experiment is set up with two flexible robots that can rotate on six axes. One moves the roller for the forming process and the other guides the laser system. Radiation tests by the laser were conducted before the forming processes. Sheets were irradiated with a laser energy level between 10 J/mm and 40 J/mm. The heat-treat condition was confirmed by micro-hardness tests. Roll (in/out) for straight contours after final hemming were measured and the effect from the heat treatment was investigated. Furthermore, the influence of the applied heat on the final hem geometry was investigated. Limitations of the conventional roller hemming process were highlighted and the transition to laser-assisted roller hemming defined.

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