scholarly journals Influence of the Aluminium Alloy Type on Defects Formation in Friction Stir Lap Welding of Thin Sheets

2018 ◽  
Vol 23 (1) ◽  
pp. 32-42 ◽  
Author(s):  
M. I. Costa ◽  
C. Leitao ◽  
D. M. Rodrigues
Keyword(s):  
Aluminium Alloys ◽  
Fatigue Behaviour ◽  
Welding Parameters ◽  
Thin Sheets ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Alloy Type ◽  
Heat Treated ◽  
Lap Welding ◽  
Applied Stresses

Abstract The weldability in Friction Stir Lap Welding (FSLW) of heat and non-heat treatable aluminium alloys, the AA6082-T6 and the AA5754-H22 aluminium alloys, respectively, are compared. For both alloys, welds were produced in very thin sheets, using the same welding parameters and procedures, and strong differences in welds morphology were found. The strength of the welds was evaluated by performing tensile-shear tests under monotonic and cyclic loading conditions. As-welded and heat-treated samples of the AA6082- T6 were tested. It was found that the heat-treatable alloy is more sensitive to defects formation, in lap welding, than the non-heat-treatable alloy. The presence of defects has a strong influence on the monotonic and fatigue behaviour of the welds. In spite of this, for very high-applied stresses, the heat-treatable alloy welds perform better in fatigue than the non-heat-treatable alloy welds.

Effects of Welding Parameters in Micro Friction Stir Lap Welding of Aluminum A1100

2013 ◽  
Vol 789 ◽  
pp. 356-359 ◽  
Author(s):  
Ario Sunar Baskoro ◽  
A.A.D. Nugroho ◽  
D. Rahayu ◽  
Suwarsono ◽  
Gandjar Kiswanto ◽  
...  
Keyword(s):  
Tilt Angle ◽  
Welding Process ◽  
Tool Material ◽  
Tensile Load ◽  
Welding Parameter ◽  
Welding Parameters ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Welding ◽  
Welding Processes

Technology of Friction Stir Welding (FSW) as a technique for joining metal is relatively new. In some cases on Aluminum joining, FSW gives better results compared with the Arc Welding processes, including the quality of welds and less distortion. FSW can even use milling machine or drilling machine, by replacing the tools and the appropriate accessories. The purpose of this study is to analyze the effect of process parameters onmicro Friction Stir Lap Weldingto the tensile load of welds. In this case, Aluminum material A1100, with thickness of 0.4 mm was used. Tool material of HSS material was shaped with micro grinding process. Tool shoulder diameter was 3 mm, while the diameter pin was 2 mm and a length of pin was 0.7 mm. The parameter variations used in this study were the variable of spindle speed (2300, 2600, and 2900 rpm), variable oftooltilt angle(0, 1, 2 degree) and a variable ofFeed rate(50, 60, 70 mm/min). Where the variation of these parameters will affect to the mechanical properties of welds (as response) was the tensile load. Analysis and optimization parameters between the micro FSLW parameters with the tensile load of welds, is used aResponse Surface Methods(RSM). From the result of experiment and analysis, it is shown that the important welding parameter in Micro Friction Stir Lap welding process is tilt angle.

Friction Stir Lap Welding of Light Alloy Sheets

2013 ◽  
Vol 814 ◽  
pp. 187-192 ◽  
Author(s):  
Radu Cojocaru ◽  
Lia Boțilă ◽  
Cristian Ciucă ◽  
Horia Florin Dascau ◽  
Victor Verbiţchi
Keyword(s):  
Welding Process ◽  
Welding Parameters ◽  
Friction Stir Lap Welding ◽  
Light Alloy ◽  
Shipbuilding Industry ◽  
Light Alloys ◽  
Butt Welding ◽  
Friction Stir ◽  
Lap Welding ◽  
Welding Materials

Aluminum alloys are widely used in aerospace, automotive, railway and shipbuilding industry, as materials having remarkable properties for applications in these fields. For this reason, in recent years the interest for friction stir lap welding of sheets from these alloys increased.The behaviour of welding materials from the plastic and mechanic viewpoint are different in case of friction stir lap welding compared to friction stir butt welding.The welding tools for friction stir lap welding can have different configurations and sizes compared to butt welding. The used welding parameters must be reconsidered in order to obtain a proper flow of material for obtaining a friction stir lap welded joint.In addition, it is very important how to prepare the sheets surfaces that come into contact and their placement (relative to each other).The paper presents considerations regarding friction stir lap welding, with examples/concrete results obtained in welding of similar and dissimilar light alloys (alloys of aluminum, magnesium and titanium). It also presents data on the characteristics of obtained welded joints, related with particularities of friction stir lap welding.The obtained results showed that light alloys sheets used in various industrial fields can be joined with respect of basis conditions specific for the friction stir lap welding process.

Friction Stir Lap Welding of Aluminium Alloys

2014 ◽  
Vol 611-612 ◽  
pp. 1421-1428
Author(s):  
Carlo Bruni ◽  
Giovanni Quercetti ◽  
Massimiliano Pieralisi
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloys ◽  
Tensile Shear ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Tool Geometries ◽  
Lap Welding ◽  
Welding Properties ◽  
Transverse Area ◽  
Tool Rotation

The friction stir welding of lap sheets can be performed considering different variables in terms of process parameters, tool configuration, welding typology and so on. The proposed investigation deals with the friction stir welding of blanks, with the same thickness, performed under lap configuration with the sheets welded, in one-side and in both sides as well, with different tool geometries and tool rotation-wise. The double side allows to extend the weld through the whole thickness leading to better mechanical welding properties at the blank to blank interface. The weld morphology has been investigated through microstructure observations performed on the transverse area, with respect to the welding velocity, of each joint. The tensile shear strength of the joint in one-side weld is generally lower than that detected in two side weld.

scholarly journals Optimization of Welding Parameters for Friction Stir Lap Welding of AA6061-T6 Alloy

2018 ◽  
Vol 08 (01) ◽  
pp. 31-41 ◽  
Author(s):  
Rathinasuriyan Chandran ◽  
Sankar Ramaiyan ◽  
Avin Ganapathi Shanbhag ◽  
S.K.V. Santhanam
Keyword(s):  
Welding Parameters ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Welding

Fracture Strengths of Mg Alloy AZ31B-H24 Friction Stir Lap Welds

2011 ◽  
Vol 275 ◽  
pp. 73-76 ◽  
Author(s):  
Zhan W. Chen ◽  
Shamzin Yazdanian ◽  
Guy Littlefair
Keyword(s):  
Stress Distribution ◽  
Fracture Strength ◽  
Rotation Speed ◽  
Mg Alloy ◽  
Welding Parameters ◽  
Friction Stir Lap Welding ◽  
Nugget Zone ◽  
Friction Stir ◽  
Lap Welding ◽  
Simulation Results

The effects of selected friction stir lap welding parameters on fracture strength of Mg alloy AZ31B-H24 welds have been studied. Rotation speed has been found to affect significantly the flow related hook size formation. Furthermore, fracture strength decreased almost linearly with hook size. A small amount of softening was detected in fracture location that was outside the nugget zone and thus this softening may only adversely affect the fracture strength slightly. Finally, simulation results are presented to show the uneven stress distribution in a lap geometry which together with the relative brittleness of the stir material must be the cause to have significantly reduced the fracture strength.

scholarly journals Influence of aluminium alloy type on dissimilar friction stir lap welding of aluminium to copper

2013 ◽  
Vol 213 (11) ◽  
pp. 1920-1928 ◽  
Author(s):  
I. Galvão ◽  
D. Verdera ◽  
D. Gesto ◽  
A. Loureiro ◽  
D.M. Rodrigues
Keyword(s):  
Aluminium Alloy ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Alloy Type ◽  
Lap Welding

scholarly journals Dissimilar Friction Stir Lap Welding of Al to Mg: Characteristic Signal, Microstructure and Mechanical Properties

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 19
Author(s):  
Yadong Zhao ◽  
Yalong Luo ◽  
Haixiao Zhang ◽  
Xuefeng Guo ◽  
Shuguang Wang ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Evaluation Model ◽  
Dynamic Performance ◽  
Welding Process ◽  
Performance Testing ◽  
Welding Parameters ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Welding ◽  
Characteristic Signal

The spindle characteristic signal (forces and vibrations) at different friction stir lap welding (FSLW) parameters were studied. The result indicated that the spindle force and vibration have different trends with the change of welding parameters. For further study, the spindle dynamic performance evaluation model by means of the Technique for Order Preference by Similarity to the Ideal Solution (TOPSIS method) was established. The model was used to calculate the relative approach degree B under different welding process parameters. The correlation between the characteristic signal and the joint properties was obtained. The model was validated by mechanical performance testing and microscopic observation. The results showed that the model evaluations were consistent with the experimental results.

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