New method to enhance the mechanical characteristics of Al-5052 alloy weldment produced by tungsten inert gas

2020 ◽  
pp. 095440542092977 ◽  
Author(s):  
Mahmoud Abbasi ◽  
Mohammad Givi ◽  
Behrouz Bagheri
Keyword(s):  
Friction Stir Processing ◽  
Good Alternative ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Friction Stir ◽  
Weld Region ◽  
Workpiece Vibration ◽  
Novel Processing ◽  
Weld Area ◽  
Strength And Ductility

Tungsten inert gas welding method is widely used to weld aluminum alloys. However, the development of some defects such as porosity and undercutting which form during tungsten inert gas welding may decrease the quality of the weld. Processing of the joint by friction stir processing is a method to enhance weld quality. In the current work, the weld area produced by tungsten inert gas is processed by friction stir processing as well as a novel processing method entitled “friction stir vibration processing.” In friction stir vibration processing, the specimen is vibrated while friction stir processing is carried out. The results show that both processing methods lead to grain refinement in the weld region and increase the strength and ductility of the tungsten inert gas–welded specimen. The stir zone grain sizes of friction stir vibration–processed samples are less than those of friction stir–processed ones. It is believed that workpiece vibration in friction stir vibration processing increases the material straining and intensifies the dynamic recrystallization. By application of friction stir processing on tungsten inert gas–welded specimen, ultimate tensile strength and ductility increase by about 10% and 22%, respectively. They increase by about 17% and 33%, respectively, as friction stir vibration processing is applied. The results also indicate that the effect of friction stir vibration processing on the microstructure of the weld region and its mechanical properties increases as vibration frequency increases. Friction stir vibration processing is a good alternative for friction stir processing, and it is recommended for application in industry.

scholarly journals Review on Friction Stir Processed TIG and Friction Stir Welded Dissimilar Alloy Joints

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 142 ◽  
Author(s):  
Sipokazi Mabuwa ◽  
Velaphi Msomi
Keyword(s):  
Friction Stir Welding ◽  
Friction Stir Processing ◽  
Aluminium Alloys ◽  
Processing Technique ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Friction Stir ◽  
Dissimilar Alloys ◽  
The Status

There is an increase in reducing the weight of structures through the use of aluminium alloys in different industries like aerospace, automotive, etc. This growing interest will lead towards using dissimilar aluminium alloys which will require welding. Currently, tungsten inert gas welding and friction stir welding are the well-known techniques suitable for joining dissimilar aluminium alloys. The welding of dissimilar alloys has its own dynamics which impact on the quality of the weld. This then suggests that there should be a process which can be used to improve the welds of dissimilar alloys post their production. Friction stir processing is viewed as one of the techniques that could be used to improve the mechanical properties of a material. This paper reports on the status and the advancement of friction stir welding, tungsten inert gas welding and the friction stir processing technique. It further looks at the variation use of friction stir processing on tungsten inert gas and friction stir welded joints with the purpose of identifying the knowledge gap.

Microstructure and mechanical characterization of tungsten inert gas-welded joint of AA6061 and AA7075 by friction stir processing

2021 ◽  
pp. 146442072110078
Author(s):  
Husain Mehdi ◽  
RS Mishra
Keyword(s):  
Tensile Strength ◽  
Wear Resistance ◽  
Friction Stir Processing ◽  
Welded Joints ◽  
Welded Joint ◽  
Stir Zone ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Friction Stir

In this work, the effect of friction stir processing (FSP) on tungsten inert gas welding (TIG) has been observed to improve mechanical properties and wear resistance behavior of TIG-welded joint of AA7075 and AA6061. The TIG-welded joints were processed by FSP at various tool rotational speeds of 700, 800, 900, 1000, and 1100 r/min with a constant feed rate of 70 mm/min and tilt angle of 1°. The maximum joint efficiency of 92.81% was observed in TIG + FSP-welded joint with filler ER5356 at a rotational tool speed of 1100 r/min. The maximum tensile strength of 284 MPa was observed in TIG + FSP-welded joint with filler ER5356, whereas the minimum tensile strength of 124 MPa was observed in the TIG weldment with filler ER4043. The cleavage facets, tears ridges, and large dimples were observed in fractured specimens of TIG-welded joints, whereas fine and equiaxed dimples were observed in TIG + FSP-welded joints. The maximum micro-hardness of 137 HV in the stir zone was observed in TIG + FSP-welded joint at a rotational tool speed of 1100 r/min. Due to intense precipitate (MgZn2) kept in the stir zone with filler ER5356, the TIG + FSP-welded joints using filler ER5356 have superior wear resistance compared to TIG and TIG + FSP-welded joint with filler ER4043.

Effect of Multi Pass Friction Stir Processing on Surface Modification and Properties of Aluminum Alloy 6061

2019 ◽  
Vol 813 ◽  
pp. 404-410
Author(s):  
Hardik Vyas ◽  
Kush P. Mehta
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Friction Stir Processing ◽  
Processing Conditions ◽  
Workpiece Material ◽  
Friction Stir ◽  
Single Pass ◽  
Aluminum Alloy 6061 ◽  
Novel Processing ◽  
Alloy 6061

In the present investigation, friction stir processing (FSP) is carried out with multi pass processing having 100 % overlap zone on the workpiece material of aluminum alloy 6061 with constant FSP parameters and varying multi pass processing conditions. Novel processing concept of multi pass FSP was performed with different rotation directions (such as clock wise and anti-clock wise directions) and processing directions (such as forward, reverse and revert directions). Surface inspection, macrographs and microstructures of the processed regions are evaluated and compared with each other. Multi-pass FSP with 100 % overlapping of two passes caused intense dynamic recrystallization and resulted in reduced grain size. Hardness of processed zone was found increased in case of two pass FSP. Minimum tensile strength was reported with double sided FSP compare to single pass and two pass FSPs. No major variations in tensile strength were reported in case of single pass and two pass FSPs.

scholarly journals Increase of bending fatigue resistance for tungsten inert gas welded SS400 steel plates using friction stir processing

2014 ◽  
Vol 61 ◽  
pp. 275-280 ◽  
Author(s):  
Kazuhiro Ito ◽  
Tatsuya Okuda ◽  
Rintaro Ueji ◽  
Hidetoshi Fujii ◽  
Chiaki Shiga
Keyword(s):  
Fatigue Resistance ◽  
Friction Stir Processing ◽  
Steel Plates ◽  
Inert Gas ◽  
Bending Fatigue ◽  
Friction Stir

Achieving high strength and ductility in double-sided friction stir processing 7050-T7451 aluminum alloy

2017 ◽  
Vol 707 ◽  
pp. 193-198 ◽  
Author(s):  
Wenjing Yang ◽  
Hua Ding ◽  
Yongliang Mu ◽  
Jizhong Li ◽  
Wenjing Zhang
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Processing ◽  
High Strength ◽  
Friction Stir ◽  
Strength And Ductility

scholarly journals Investigating the Effect of TIG and FSW Joint Design on the Mechanical Properties of the AA5083 Aluminum Alloy in Welding Processes

2020 ◽  
Vol 4 (2) ◽  
pp. 7-13
Author(s):  
Meysam Akbari ◽  
Manouchehr Fadavi Ardestani ◽  
Hamid Bakhtiari ◽  
Zahra Bakhtiari
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Butt Weld ◽  
Friction Stir ◽  
High Speeds ◽  
Aa5083 Aluminum Alloy ◽  
Welding Processes

The 5083 aluminium alloy is one of the alloys of the 5xxx series that is widely used in defence and shipbuilding industries. In this study, the 5083 aluminium alloy plates were evaluated through two friction stir welding and tungsten inert gas welding (TIG) by a double groove weld with a 30° angle and a 2mm gap for TIG and a simple butt weld for FSW. In this study and in addition to examining the samples' mechanical properties, the microstructure changes and the hardness were also reviewed. The results show that the FSW weld has better mechanical properties than the TIG weld due to fast welding speed. However, by preparing the pieces, the mechanical properties of TIG get closer to those of FSW. In the FSW welding in the weld nugget, the grains have a fine and co-axial structure, and an increase in the advance rate will reduce the inlet heat and make the grains smaller. Nevertheless, in TIG welding at high speeds, the grains become more extensive with increased inlet heat.

scholarly journals On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

2018 ◽  
Vol 23 (4) ◽  
pp. 363-379
Author(s):  
Mohsen Barmouz ◽  
Abbas Dodangeh ◽  
Hadi Ghiabakloo ◽  
Kaveh Rahimi Mamaghani
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Friction Stir Processing ◽  
Pure Copper ◽  
Friction Stir ◽  
Microstructural Evaluation ◽  
Microstructural Morphology ◽  
Increased Strength ◽  
Strength And Ductility

The effect of prior constrained groove pressing on friction stir processing (FSP) of pure copper was investigated. The results illustrate the development of high strain and strength of FSP samples along with an increased strength base metal as a result of applying for a prior constrained groove pressing (CGP) pass. The influences of further FSP passes on the microstructures, and mechanical properties were also shown. The microstructural evaluation of the specimens indicated up to 10 times grain size reduction in FSP specimens as well as equiaxed microstructural morphology. Mechanical properties of the specimens were carried out through tensile and microhardness tests. It was demonstrated that the FSP could improve the strength and ductility of the specimens simultaneously through improved mechanical properties of the base metal resulting from prior CGP. The performed calculations show that values of dislocation density of the CGPed specimens experienced significant change after applying for FSP passes.

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