scholarly journals Brazed Joint Interface Bonding Strength of AR500 Steel and AA7075 Aluminium Alloy

2018 ◽  
Author(s):  
Mohd Najib Muhamed ◽  
Mohd Zaidi Omar ◽  
Shahrum Abdullah ◽  
Zainuddin Sajuri ◽  
Wan Fathul Hakim Wan Zamri ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Filler Metal ◽  
Intermetallic Phase ◽  
High Strength ◽  
Fusion Welding ◽  
Joint Interface ◽  
Dissimilar Metals ◽  
Brazed Joints ◽  
Interface Bonding Strength

Joining of aluminium alloys to steels has been extensively studied, especially in the automotive sector. However, aluminium alloys are known to be difficult to join with steels when methods involving fusion welding are used because of hot cracking problem. Hence, a high strength joint between these dissimilar metals would be of benefit especially in reducing the weight of products. In this work the torch brazing method was applied to join AR500 steel with AA7075 aluminium alloy using Al-Si-Zn base filler metal at various flame times. The effect of the brazing work on the intermetallic phase formation and the mechanical strength of the joints were investigated. In this work, the maximum shear load obtained was 6460 N and the presence of the intermetallic phases had reduced the shear strength of the brazed joints. However, the torch brazing process using Al-Si-Zn filler metal had successfully facilitated the joining of these dissimilar metals.

scholarly journals Brazed Joint Interface Bonding Strength of AR500 Steel and AA7075 Aluminium Alloy

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 668 ◽  
Author(s):  
Mohd Muhamed ◽  
Mohd Omar ◽  
Shahrum Abdullah ◽  
Zainuddin Sajuri ◽  
Wan Wan Zamri ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Filler Metal ◽  
Intermetallic Phase ◽  
High Strength ◽  
Fusion Welding ◽  
Joint Interface ◽  
Dissimilar Metals ◽  
Brazed Joints ◽  
Interface Bonding Strength

The joining of aluminium alloys to steels has been extensively studied, especially in the automotive sector. However, aluminium alloys are known to be difficult to join with steels when methods involving fusion welding are used because of the hot cracking problem. Hence, a high-strength joint between these dissimilar metals would be of benefit especially in reducing the weight of products. In this work, the torch-brazing method was applied to join AR500 steel with AA7075 aluminium alloy using Al–Si–Zn base filler metal at various flame times. The effects of the brazing work on the intermetallic phase formation and the mechanical strength of the joints were investigated. In this work, the maximum shear load obtained was 6460 N and the presence of the intermetallic phases had reduced the shear strength of the brazed joints. However, the torch-brazing process using Al–Si–Zn filler metal had successfully facilitated the joining of these dissimilar metals.

Correlation Between Microstructure and Mechanical Properties of Diffusion Brazed MAR-M 247

1993 ◽  
Author(s):  
W. Miglietti
Keyword(s):  
Filler Metal ◽  
Turbine Blades ◽  
High Strength ◽  
Strength Properties ◽  
Joint Microstructure ◽  
Investment Cast ◽  
Diffusion Brazing ◽  
Brazed Joints ◽  
Joining Process ◽  
Turbine Blading

Diffusion brazing is a joining process utilized in the manufacture and repair of turbine blades and vanes. MAR-M247 is an investment cast Ni-based superalloy used for turbine blading and has good strength properties at high temperatures. The objectives of this work was to develop a diffusion brazing procedure to achieve high strength joints. A commercially available diffusion brazing filler metal of composition Ni-15Cr-3,5B of 100 μm thickness was used. With the desire to eliminate brittle centre-line phases, the effects of the processing variables (only temperature and time) on the joint microstructure was studied. Once the metallurgy of the joint was understood, mechanical property assessments were undertaken i.e. tensile and creep rupture tests, and the latter being the severest test to evaluate joint strength. The results demonstrated that the diffusion brazed joints had nearly equivalent mechanical strength to that of the parent metal. This showed that the resultant diffusion brazing parameters enabled effective and reliable joining of MAR-M247.

scholarly journals The Effect of Copper and Brass on Friction Stir Welded Dissimilar Aluminium Alloy When Used as in Thin Sheet Form

2016 ◽  
Vol 45 (2) ◽  
pp. 118-122
Author(s):  
G. Gopala Krishna ◽  
P.Ram Reddy ◽  
M.Manzoor Hussain
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Low Cost ◽  
Thin Sheet ◽  
Welding Process ◽  
Cost Effective ◽  
Tensile Tests ◽  
Fusion Welding ◽  
Friction Stir ◽  
Effect Of Copper

In recent year’s aluminium and aluminium alloys are most widely used in many applications because of light weight, good formability and malleability, corrosion resistance, moderate strength and low cost. Friction Stir Welding (FSW) process is efficient and cost effective method for welding aluminium and aluminium alloys. FSW is a solid state welding process that means the material is not melted during the process. Complete welding process accomplishes below the melting point of materials so it overcomes many welding defects that usually happens with conventional fusion welding technique which were initially used for low melting materials. Though this process is initially developed for low melting materials but now process is widely used for a variety of other materials including titanium, steel and also for composites. The present butt jointed FSW experimental work has been done in two ways. Initially a comparison of tensile properties of friction stir (FS) welded similar aluminium alloy (AA6351 with AA6351) and dissimilar aluminium alloy (AA6351 with AA5083) combinations. Later the effect of impurities (copper and brass) in sheet form (0.1 mm thick) when used as insert in between two dissimilar aluminium alloy (AA6351 with AA5083) plates during FSW. Tensile tests were performed for these combinations and results were compared for with and without using strip material (copper and brass).

Certain Weldability Problems of 6082-T6 Aluminium Alloy and the Mechanical Properties of the Welded Joints

2017 ◽  
Vol 885 ◽  
pp. 251-256
Author(s):  
Dóra Pósalaky ◽  
János Lukács ◽  
Imre Török
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Physical Simulation ◽  
Gas Metal Arc Welding ◽  
High Strength ◽  
Transport Systems ◽  
Railway Transport ◽  
Metal Arc Welding ◽  
Industry Sectors ◽  
Weight Structures

The usage of modern high strength aluminium alloys are getting more remarkable in several industry sectors mostly the fabrication of light weight structures, such as vehicles, railway transport systems, aerostructures and building constructions. The weldability problems of these alloys are more complex than the steels with similar strength. Therefore weldability problems must be analyzed very accurately, by the help of the modern physical simulation. By knowing the difficulties of the weldability of high strength aluminium alloys the proper parameters of the welding technology can be defined. This article represents the investigation of a certain weldability problem of 6082T6 aluminium alloy with the aim of physical simulation and welding experiments with gas metal arc welding and pulsed current technology.

Chronicling the Development of a High Strength 5xxx-Based Superplastic Aluminium Alloy

2016 ◽  
Vol 838-839 ◽  
pp. 208-213
Author(s):  
Simon Peter Miller-Jupp
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Automotive Industry ◽  
Aluminium Alloys ◽  
Superplastic Forming ◽  
High Strength ◽  
Lessons Learned ◽  
Type Alloy ◽  
Strength Alloy ◽  
Almost All

In recent years there has been a largely unspoken demand for a high strength, non-heat treatable aluminium alloy for superplastic forming applications. This is particularly true for the automotive industry since the high strength, superplastic aluminium alloys, such as AA7475, are both too time consuming (in forming and heat treatment) and too expensive. Compound this with the expense of corrosion protection and almost all aluminium alloys except for AA5083 fall by the wayside for the automobile industry.However, the need for a higher strength alloy has remained. To achieve this Hydro has systematically investigated the basis behind the superplastic forming of AA5083. On this basis a new high strength 5xxx alloy was extrapolated. The resulting alloy was then characterised and benchmarked against the existing SPF alloy, AA5083. The new alloy, an AA5456-type alloy demonstrated a higher strength than AA5083 while improving the formability and rate of forming. This paper will discuss some of the lessons learned during the development of this alloy.

scholarly journals Machinability Optimization of Abrasive Water Jet Cutting Process on AA6082 Aluminium Alloy

2019 ◽  
Vol 8 (10) ◽  
pp. 2134-2140
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
High Strength ◽  
Water Jet ◽  
Manufacturing Industries ◽  
Cutting Process ◽  
Abrasive Water Jet ◽  
Water Jet Cutting ◽  
Abrasive Water Jet Cutting ◽  
Rsm Technique

Aluminium alloys are extensively used nowadays in various manufacturing industries due to its special properties and high strength. In this study, AA6082 aluminium alloy is taken into consideration by studying the machinability properties using the abrasive water jet cutting process. RSM technique is used for conducting the experiments by varying the input factors such as stand-off distance, abrasive feed and nozzle transverse speed. The effect of hardness and surface roughness is investigated. The correlation between the input parameters and the corresponding output was tested by analysis of variance to check the 95% confidence level.

scholarly journals Review on Multi-Pass Friction Stir Processing of Aluminium Alloys

2020 ◽  
Author(s):  
Oritonda Muribwathoho ◽  
Sipokazi Mabuwa ◽  
Velaphi Msomi
Keyword(s):  
Friction Stir Processing ◽  
Aluminium Alloys ◽  
Weight Ratio ◽  
High Strength ◽  
Fatigue Properties ◽  
Dissimilar Metals ◽  
Friction Stir ◽  
Aluminium Copper ◽  
The Impact ◽  
Welding Technique

Aluminium alloys have evolved as suitable materials for automotive and aircraft industries due to their reduced weight, excellent fatigue properties, high-strength to weight ratio, high workability/formability, and corrosion resistance. Recently, the joining of similar and dissimilar metals have achieved huge success in various sectors. The processing of soft metals like aluminium, copper, iron and nickel have been fabricated using friction stir processing. Friction stir processing (FSP) is a microstructural modifying technique that uses the same principles as the friction stir welding technique. In the majority of studies on FSP, the effect of process parameters on the microstructure was characterized after a single pass. However, multiple passes of FSP is another method to further modify the microstructure in aluminium castings. This study is aimed at reviewing the impact of multi-pass friction stir processed joints of aluminium alloys and to identify a knowledge gap. From the literature that is available on multi-pass FSP, it has been observed that the majority of the literature focused on the processing of plates than the joints. There is limited literature reporting on multi-pass friction stir processed joints. This then creates a need to study further on multi-pass friction stir processing on dissimilar aluminium alloys.

Investigation and Constitutive Modelling of High Strength 6xxx Series Aluminium Alloy: Precipitation Hardening Responses to FAST (Fast Light Alloys Stamping Technology) and Artificial Ageing

2018 ◽  
Vol 941 ◽  
pp. 814-820 ◽  
Author(s):  
Qun Li Zhang ◽  
Saksham Dhawan ◽  
Xi Luan ◽  
Qiang Du ◽  
Jun Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Precipitation Hardening ◽  
High Strength ◽  
Temperature Deformation ◽  
Artificial Ageing ◽  
Light Alloys ◽  
Fast Light ◽  
6Xxx Series

FAST (Fast light Alloys Stamping Technology) has recently been developed to efficiently and economically manufacture lightweight, high strength structural components from aluminium alloys sheet. Post-form strength prediction of 6xxx series aluminium alloy (AA6xxx) after FAST and multiple stage heat treatments has been a challenge. This is due to the effect of pre-existing dislocations induced via high temperature plastic deformation in the forming process. In the present research, a new PFS (post-form strength) model has been proposed to predict the age-hardening response of AA6xxx alloys undergoing FAST and subsequent thermal cycles. The model incorporates two sub-models, for simulating viscoplastic flow and predicting strength evolution respectively. The first sub-model incorporates a set of constitutive equations, developed to model the stress-strain curve of AA6xxx during FAST. The second sub-model employs precipitation-hardening and dislocation-hardening theories to simulate the evolution of microstructure and, as a consequence, strength of alloys undergoing artificial ageing cycles. This is calculated by considering the intrinsic resistance of the alloy to dislocation movement due to solute atoms and precipitates. The strength was computed accurately via the internal state variables method, in which dislocation density, volume fraction of precipitates, solute concentration and radii of precipitates were correlated. Furthermore, the model was validated by comparing results with transmission electron microscope (TEM) images as well as hardness measurements. Hence, the model performs as a powerful and comprehensive tool to simulate post-form strength of 6xxx series aluminium alloys that undergo complicated thermomechanical processes including high temperature deformation and post-form heat treatment, with less than 5% deviation between measured and predicted values.

Evaluation of Aeroplane Metals

1946 ◽  
Vol 50 (431) ◽  
pp. 811-828
Author(s):  
J. A. Van Den Broek
Keyword(s):  
Stainless Steel ◽  
Magnesium Alloy ◽  
Aluminium Alloy ◽  
Yield Stress ◽  
Modulus Of Elasticity ◽  
Aluminium Alloys ◽  
Elastic Limit ◽  
High Strength ◽  
Research Project ◽  
The U.S

The material herein presented was gathered as part of a research project for the Bureau of Aeronautics (Structures Branch) of the U.S. Navy on “Evaluation of High Strength Aluminium Alloys.” The Bureau has released this material for independent publication.In this paper the physical constants determined are limited to elastic limit, yield stress, ultimate stress, modulus of elasticity, weight and ductility. The materials tested are primarily the new aluminium alloys 75 ST, R 301 T, and R 303 T.To offer an immediate basis of comparison for aluminium alloys, the aluminium alloy at present in common use, namely 24 ST, was also tested. To extend the scope of the project still further, a few tests on magnesium alloy and stainless steel were included.

scholarly journals Investigation on Strength and Microstructural Evolution of Porous Cu/Cu Brazed Joints Using Cu-Ni-Sn-P Filler

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 416
Author(s):  
Mian Muhammad Sami ◽  
Tuan Zaharinie ◽  
Farazila Yusof ◽  
Tadashi Ariga
Keyword(s):  
Surface Hardening ◽  
Filler Metal ◽  
Joint Interface ◽  
X Ray Diffraction ◽  
Cooling Device ◽  
X Ray ◽  
Porous Copper ◽  
Brazed Joints ◽  
Increasing Temperature ◽  
Integral Feature

Porous Copper (Cu) was brazed to Cu plates using Cu-9.7Sn-5.7Ni-7P amorphous filler metal. The effects of brazing parameters on the porous Cu and brazed joints were investigated. The furnace brazing temperatures employed were 660 °C and 680 °C, and the holding times were 10 and 15 min. After brazing, the microstructure was analyzed using Scanning Electron Microscope (SEM) equipped with Electron Dispersive X-ray Spectroscope (EDS). SEM results showed that the thickness of the brazed seam at the base joint decreased with increasing temperature and time. At low brazing temperature, microvoids and cracks were observed at the joint interface. The microvoids and cracks disappeared in the sample brazed at 680 °C for 15 min, and higher diffusion of the filler was noted in the overall bonded region. The formation of Cu-P, Cu-Ni, and Ni-Sn phases at the joint interface was validated using X-ray diffraction. The phases formed increased the hardness of the brazed joints and porous Copper. It was observed that the rigidity of porous Copper tends to increase due to surface hardening effects. The rigidity of porous Cu after brazing is important in ensuring minimal deformation during cooling device servicing, which is an integral feature of prospect product development.

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