Formation of Intermetallic Compounds in Dissimilar Friction Spot Weld of Al to Mg Alloys

2013 ◽  
Vol 765 ◽  
pp. 731-735 ◽  
Author(s):  
Uceu Suhuddin ◽  
Vanessa Fischer ◽  
Jorge dos Santos
Keyword(s):  
Plastic Deformation ◽  
Spot Welding ◽  
Dwell Time ◽  
Welding Process ◽  
Eutectic Structure ◽  
Mixed Solution ◽  
Microstructure Formation ◽  
Friction Spot Welding ◽  
Welding Cycle ◽  
Insight Into

In the present study, friction spot welding has been used for joining dissimilar AA5754 aluminum to AZ31 magnesium alloys. To get more insight into the microstructure, stop-action experimentation was employed. The welding cycle was forced to stop during the dwell time, and subsequently, the weld was quenched by pouring a mixed solution of ice and water to freeze the microstructure. Formation of the liquid phase leading to a formation of brittle intermetallic compound has been studied. Microstructural analyses reveal that formation of intercalated layers and a high density of grain boundaries induced by plastic deformation enhance the formation of eutectic structure during the welding process.

scholarly journals Parameters optimization for friction spot welding of AZ31 magnesium alloy by Taguchi method

2012 ◽  
Vol 17 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Leonardo Contri Campanelli ◽  
Uceu Fuad Hasan Suhuddin ◽  
Jorge Fernandez dos Santos ◽  
Nelson Guedes de Alcântara
Keyword(s):  
Shear Strength ◽  
Magnesium Alloy ◽  
Rotational Speed ◽  
Spot Welding ◽  
Dwell Time ◽  
Az31 Magnesium Alloy ◽  
Lap Shear Strength ◽  
Plunge Depth ◽  
Friction Spot Welding ◽  
Lap Shear

Friction spot welding (FSpW) is a solid state welding process suitable for producing spot-like joints, especially in lightweight materials, which are particularly interesting due to the weight saving potential. The plunging of an especially designed non-consumable and rotating tool creates a connection between overlapped sheets through frictional heat and plastic deformation. Minimum material loss is observed, and therefore a fully consolidated joint with flat surface (no keyhole) is obtained. In the current study, the effect of FSpW parameters, such as rotational speed, plunge depth and dwell time, on lap shear strength of AZ31 magnesium alloy joints was investigated. The optimization of input process parameters was carried out through Taguchi approach of DOE. Analysis of variance was applied to determine the individual importance of each parameter. Main effect plots were used to indicate the best levels for maximizing lap shear strength. The results show that tool plunge depth has the higher effect on the weld strength, followed by rotational speed and dwell time.

Optimization of Friction Spot Welding Process Parameters for AA2198-T8 Sheets

2014 ◽  
Vol 29 (8) ◽  
pp. 934-940 ◽  
Author(s):  
G. Pieta ◽  
J. dos Santos ◽  
T. R. Strohaecker ◽  
T. Clarke
Keyword(s):  
Process Parameters ◽  
Spot Welding ◽  
Welding Process ◽  
Friction Spot Welding

Effect of Spot Welding Current and Cycles on the Mechanical Properties of Welded Galvanized Steel Sheets

2013 ◽  
Vol 795 ◽  
pp. 87-90 ◽  
Author(s):  
Shamsul Baharin Jamaludin ◽  
Mohd Noor Mazlee ◽  
Muhammad Rifki Ismail ◽  
Khairel Rafezi Ahmad ◽  
Kamarudin Hussin
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Welding Process ◽  
Welding Current ◽  
Galvanized Steel ◽  
Shear Load ◽  
Tensile Shear ◽  
Steel Sheets ◽  
Welding Cycle

Studies on the effects of welding current and cycles were carried on the galvanized steel sheets using spot welding. The welding currents used were 3 kA, 5 kA 6 kA and the welding cycles were 4, 6 and 8. Tensile shear and tensile peel load were determined on the joint of welded specimens. The results showed that the value of tensile shear load was lower than tensile peel load. The strength of the joint increased with the increasing of welding current and welding cycle used in the welding process.

scholarly journals The optimization of friction spot welding process parameters in AA6181-T4 and Ti6Al4V dissimilar joints

2015 ◽  
Vol 83 ◽  
pp. 36-41 ◽  
Author(s):  
A.H. Plaine ◽  
A.R. Gonzalez ◽  
U.F.H. Suhuddin ◽  
J.F. dos Santos ◽  
N.G. Alcântara
Keyword(s):  
Process Parameters ◽  
Spot Welding ◽  
Welding Process ◽  
Dissimilar Joints ◽  
Friction Spot Welding

scholarly journals Friction Spot Welding of Similar AA5754 to AA5754 Aluminum Alloys and Dissimilar AA5754 Aluminum to AZ31 Magnesium Alloys

2015 ◽  
Vol 1112 ◽  
pp. 485-488 ◽  
Author(s):  
U.F.H. Suhuddin ◽  
Debora Piccolo ◽  
Vanessa Fischer ◽  
Jorge F. dos Santos
Keyword(s):  
Solid State ◽  
Aluminum Alloys ◽  
Magnesium Alloys ◽  
Spot Welding ◽  
Flat Surface ◽  
Welding Process ◽  
Al Alloys ◽  
Mg Alloys ◽  
Material Loss ◽  
Friction Spot Welding

Friction spot welding is a solid-state spot welding process developed and patented by Helmholtz-Zentrum Geesthacht, Germany. A non-consumable rotating tool consisting of two rotating parts, a pin and a sleeve, and one stationary clamping ring is used to join two or more similar/dissimilar sheets of materials in lap configuration. The result is a spot welded lap connection with minimal material loss and a flat surface without keyhole. The present work presents a summary of results from studies in similar AA5754 to AA5754 Al alloys and dissimilar AA5754 Al to AZ31 Mg alloys.

Preliminary Investigation on Friction Spot Welding of AZ31 Magnesium Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 3016-3021 ◽  
Author(s):  
L.C. Campanelli ◽  
U.F.H. Suhuddin ◽  
Jorge Fernandez Dos Santos ◽  
N.G. Alcantara
Keyword(s):  
Magnesium Alloy ◽  
Spot Welding ◽  
Welding Process ◽  
High Energy ◽  
Az31 Magnesium Alloy ◽  
Frictional Heat ◽  
Welding Parameters ◽  
Friction Stir ◽  
Friction Spot Welding ◽  
Lap Shear

Friction spot welding (FSpW) is a recent solid state welding process developed and patented by GKSS Forschungszentrum (now Helmholtz-Zentrum Geesthacht), Germany. A spot-like connection is produced by means of an especially designed non-consumable tool consisting of pin, sleeve and clamping ring that creates a joint between sheets in overlap configuration through frictional heat and plastic deformation. FSpW offers many advantages over conventional spot joining techniques including high energy efficiency, surface quality and environmental compatibility. Comparing with friction stir spot welding, FSpW produces a weld without keyhole on the surface at the end of the joining process. In the present study, the possibility of joining AZ31 magnesium alloy by FSpW technique was evaluated by using different welding parameters (rotational speed, plunge depth and dwell time), aiming to produce high quality connections. Microstructural features were analyzed by light optical microscope and mechanical performance was investigated by microhardness test and lap shear test. Microstructure analysis revealed that defects free welds could be produced. A slight decrease in grain size of the stir zone was observed causing a slight increase in the microhardness of this region. The preliminary lap shear data demonstrated that the weld strength is comparable to other welding process.

A new refill friction spot welding process for aluminum/polymer composite hybrid structures

2017 ◽  
Vol 174 ◽  
pp. 59-69 ◽  
Author(s):  
Hossein Karami Pabandi ◽  
Mojtaba Movahedi ◽  
Amir Hossein Kokabi
Keyword(s):  
Polymer Composite ◽  
Spot Welding ◽  
Welding Process ◽  
Hybrid Structures ◽  
Friction Spot Welding

THERMOMECHANICAL ANALYSIS OF THE RESISTANCE SPOT-WELDING PROCESS

2018 ◽  
Vol 10 (5) ◽  
pp. 449-455 ◽  
Author(s):  
Habib Lebbal ◽  
Lahouari Boukhris ◽  
Habib Berrekia ◽  
Abdelkader Ziadi
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Process ◽  
Thermomechanical Analysis ◽  
Resistance Spot

scholarly journals Influence of Hydrostatic Extrusion on the Mechanical Properties of the Model Al-Mg Alloys

2021 ◽  
Author(s):  
Aleksandra Towarek ◽  
Wojciech Jurczak ◽  
Joanna Zdunek ◽  
Mariusz Kulczyk ◽  
Jarosław Mizera
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Microstructural Analysis ◽  
Tensile Tests ◽  
Hydrostatic Extrusion ◽  
Microstructure Formation ◽  
Initial State ◽  
Degree Of Deformation ◽  
Al Mg Alloys

AbstractTwo model aluminium-magnesium alloys, containing 3 and 7.5 wt.% of Mg, were subjected to plastic deformation by means of hydrostatic extrusion (HE). Two degrees of deformation were imposed by two subsequent reductions of the diameter. Microstructural analysis and tensile tests of the materials in the initial state and after deformation were performed. For both materials, HE extrusion resulted in the deformation of the microstructure—formation of the un-equilibrium grain boundaries and partition of the grains. What is more, HE resulted in a significant increase of tensile strength and decrease of the elongation, mostly after the first degree of deformation.

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