Microstructural study in AA7075 alloys welded with different filler metals

MRS Advances ◽  
2019 ◽  
Vol 4 (55-56) ◽  
pp. 3017-3029
Author(s):  
Juan Manuel Salgado L. ◽  
Abraham Silva Hernandez ◽  
Francisco Ignacio López Monroy ◽  
José Luis Ojeda Elizarráras ◽  
Jesús Mauricio Tello Rico
Keyword(s):  
Welded Joints ◽  
Vickers Microhardness ◽  
Microstructural Analysis ◽  
Hot Cracking ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Microstructural Study ◽  
Final Microstructure ◽  
Aa 7075 ◽  
Filler Metals

ABSTRACTEven though AA 7075 is an aluminum alloy with high mechanical properties, it is not often applied in manufacturing. This is so, because it is considered as very difficult to produce defect free welded joints. This is so, because this alloy has a tendency to hot cracking. The metallurgical problems that appear during welding of AA 7075 have not been fully solved but they have been reduced by applying alloys such as: 4043 and 5356 as filler metals. However, in literature there is little information about the metallurgical effects of these types of filler metals applied in arc welded joints of AA7075. This is especially true for Tungsten Inert gas welding. Therefore, this work is focused in comparing the microstructure and Vickers microhardness in weldments of AA 7075 with ER4043, ER5356 and AA7075 as filler metals. Besides, a set of welded joints with the three different filler metals were quenched after welding in order to modify the final microstructure. The results were evaluated by microstructural analysis focused on the Heat Affected Zone and Vickers microhardness and they were compared among them.

FEASIBILITY STUDY ON JOINING DISSIMILAR ALUMINUM ALLOYS AA6061 AND AA7075 BY TUNGSTEN INERT GAS (TIG)

2015 ◽  
Vol 75 (7) ◽  
Author(s):  
Mahadzir Ishak ◽  
Nur Fakhriah Mohd Noordin ◽  
Luqman Hakim Ahmad Shah
Keyword(s):  
Aluminum Alloys ◽  
Butt Joint ◽  
Tig Welding ◽  
Inert Gas ◽  
Depth Of Penetration ◽  
Visual Appearance ◽  
Melted Zone ◽  
Dissimilar Aluminum Alloys ◽  
Aa 7075 ◽  
Filler Metals

The aim of this paper is to study the feasibility of welding dissimilar aluminum alloys AA6061 and AA7075 using different types of filler metals which are ER4043 and ER5356. The tungsten inert gas (TIG) welding method was used to butt joint these alloys. The effect of ER4043 (Si-rich) and ER5356 (Mg-rich) on weldability of the joint were studied through visual appearance, microstructures and hardness. It was found that, welding using filler ER5356 produced deeper penetration compared to filler ER4043. The depth of penetration obtained using filler ER5356 was 1.74 mm, while only 0.9 mm of penetration was obtained using ER4043. Microstructures at different zones of dissimilar TIG joints such as the fusion zone (FZ), the partially melted zone (PMZ) and the heat affected zone (HAZ) were identified. The grain size at FZ from filler ER5356 samples was finer compared to filler ER4043 which was 11.4 µm and 19.5 µm, respectively. The average hardness welding value of filler ER5356 samples was higher compared to filler ER4043 samples, which were 100HV and 86HV, respectively at HAZ of AA 6061, 110HV and 88HV, respectively at FZ, while 113HV and 85HV, respectively at HAZ of AA 7075. It can be concluded that TIG welding using the ER5356 filler yields better joint compared to ER4043.

scholarly journals Corrosion Resistance of TIG Welded Joints of Stainless Steels

2017 ◽  
Vol 885 ◽  
pp. 190-195 ◽  
Author(s):  
Amanda Silveira Alcantara ◽  
Enikő Réka Fábián ◽  
Monika Furkó ◽  
Éva Fazakas ◽  
János Dobránszky ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ferric Chloride ◽  
Stainless Steels ◽  
Welded Joints ◽  
Welding Process ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Type Stainless Steel ◽  
Different Types

The aim of this work was to analyze the performance of joints made by TIG (Tungsten Inert Gas) welding process in austenitic and duplex stainless steels with special regards to their corrosion resistance. Three different types of stainless steel were butt welded with TIG method. Ferric-chloride test and electrochemical treatments revealed how does the TIG process affects the corrosion resistance depending upon the alloy used for welding the joint. This work focuses on the weldability of the 2304, 2404 and 304 type stainless steel heterogeneous welds.

scholarly journals Modeling of Bending Properties of Stainless Steel 304 Sheets Welded by Tungsten Inert Gas Welding Process

2019 ◽  
Vol 15 (4) ◽  
pp. 10-22
Author(s):  
Ali Hussein Alwan
Keyword(s):  
Stainless Steel ◽  
Welded Joints ◽  
Gas Pressure ◽  
Inert Gas ◽  
Welding Parameters ◽  
Tungsten Inert Gas Welding ◽  
Bending Properties ◽  
Argon Gas ◽  
Bending Force ◽  
Stainless Steel 304

In this research, the effects of both current and argon gas pressure on the bending properties of welded joints were studied. Using the possible ranges of welding gas pressures and currents, Tungsten inert gas welding (TIG) of stainless steel (304) sheet was used to obtain their influence on the maximum bending force of the (TIG) welded joints. Design of experiment (DOE) ‘version 10' was used to determine the design matrix of experiments depending on the used levels of the input factors. Response surface methodology (RSM) technique was used to obtain an empirical mathematical model for the maximum bending force as a function of welding parameters (Current and Argon gas pressure). Also, the analysis of variance (ANOVA) was used to verify the adequacy of the resulted model statistically.  

Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D

2007 ◽  
Vol 23 (11) ◽  
pp. 1294-1299 ◽  
Author(s):  
W. Zhou ◽  
T. Z. Long ◽  
C. K. Mark
Keyword(s):  
Magnesium Alloy ◽  
Hot Cracking ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Alloy Az91d

Structure and Properties of Welded Joints of Titanium Substrates with Ti-Ta Corrosion Resistant Coatings

2014 ◽  
Vol 698 ◽  
pp. 316-320
Author(s):  
P.N. Komarov ◽  
A.A. Ruktuev ◽  
M.G. Golkovski
Keyword(s):  
Welded Joints ◽  
Titanium Substrate ◽  
Inert Gas ◽  
Inhomogeneous Distribution ◽  
Structure And Properties ◽  
Tungsten Inert Gas Welding ◽  
Corrosion Resistant ◽  
Martensitic Microstructure ◽  
Corrosion Resistant Coatings ◽  
Titanium Substrates

The possibility of joining titanium substrates with Ti-Ta corrosion-resistant coatings was investigated. Joints were obtained by manual tungsten inert gas welding. Microstructure investigations revealed the inhomogeneous distribution of alloying elements and a martensitic microstructure in joints. Microhardness values in Ti-Ta coatings and welded seams were approximately equal and varied from 380 to 420 HV. The value of titanium substrate microhardness was about 180 HV. An ultimate strength of welded joints was equal to 580 MPa while the strength of the starting material was 365MPa.

Comparative Hot Cracking Evaluation Of Welded Joints Of Alloy 690 Using Filler Metals InconelSr 52 And 52 Mss

2011 ◽  
Vol 55 (9-10) ◽  
pp. 28-35 ◽  
Author(s):  
Konstantin Yushchenko ◽  
Viktor Savchenko ◽  
Nikolay Chervyakov ◽  
Anna Zvyagintseva ◽  
Evelyne Guyot
Keyword(s):  
Welded Joints ◽  
Hot Cracking ◽  
Alloy 690 ◽  
Filler Metals

Study of 7075 Aluminium Alloy Joints

2017 ◽  
Vol 15 (13) ◽  
pp. 7-11 ◽  
Author(s):  
Ildiko Peter ◽  
Mario Rosso
Keyword(s):  
Mechanical Properties ◽  
Microstructural Analysis ◽  
High Strength ◽  
Inert Gas ◽  
Structural Components ◽  
Tungsten Inert Gas Welding ◽  
Mechanical Performances ◽  
The Many ◽  
Welding Procedure ◽  
Welding Technique

AbstractHigh-strength EN AW 7075 Al-based alloy (Al-Zn-Mg-Cu) is currently employed in many industrial fields where excellent mechanical performances of structural components are required. In contrast to the many positive features this alloy presents, it is not fusion weldable, because it is subjected to solidification and liquation cracking. In this paper, the possibility to weld low thickness plates, made of 7075 aluminum alloy, by the tungsten inert gas welding technique will be presented. Two types of welding have been performed: for the former one, welding involves only one surface, while for the second one, welding has been carried out on both faces of the plates. After welding, microstructural analysis and mechanical properties investigations have been carried out. The present research highlights that the mechanical properties evolution is affected by the welding procedure. In particular, the mechanical strength reached for the samples welded on both faces, in the proposed setting, is comparable to that of the un-welded alloys.

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