scholarly journals Microstructure and Conductivity of the Al-Cu Joint Processed by Friction Stir Welding

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Yanni Wei ◽  
Hui Li ◽  
Peng Xiao ◽  
Juntao Zou
Keyword(s):  
Friction Stir Welding ◽  
Rotation Speed ◽  
Pure Copper ◽  
Compound Layer ◽  
Intermetallic Compound Layer ◽  
Interfacial Resistance ◽  
Cross Sectional ◽  
Interface Zone ◽  
Friction Stir ◽  
Good Surface

In this paper, 1060 aluminum and T2 pure copper were joined by friction stir welding. The influence of the rotation speed and inclination on the microstructure and mechanical properties of the joint were investigated. The microstructure and composition of the welded interface region were analyzed. The joints’ strength was tested, and the conductivity of the joints was estimated. Joints having good surface formation and defect-free cross section were successfully obtained. The cross-sectional morphologies of the Al-Cu friction stir welding joints can be divided into three zones: the shoulder impact zone, the weld nugget zone, and the interface zone. The interface zone consisted of a metallurgical reaction layer and a visible mixed structure. The reaction layers were identified as Al2Cu, Al4Cu9 phases. The tensile strength of the joints reaches maximum values of 102 MPa at a rotation speed of 950 rpm and inclination of 0°, which was approximately equal to those of 1060Al base metal. The resistivity of the Al-Cu joint was approximately equal to the theoretical resistivity. The interfacial resistance is directly affected by the joint defects, compound types, and thickness of the intermetallic compound layer.

Microstructure and Mechanical Properties of Friction Stir Welded Annealed Pure Copper Joints

2013 ◽  
Vol 787 ◽  
pp. 346-351
Author(s):  
Salar Salahi ◽  
Vahid Rezazadeh ◽  
Atabak Iranizad ◽  
Ali Hosseinzadeh ◽  
Amir Safari
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Welding Speed ◽  
Heat Input ◽  
Applied Load ◽  
Rotation Speed ◽  
Pure Copper ◽  
Friction Stir ◽  
Tool Rotation Speed ◽  
Tool Rotation

As a novel technique for joining materials, friction stir welding (FSW) has significant advantages over the conventional welding methods and is widely applied for joining different materials including aluminum, magnesium and copper alloys. In this research, the mechanical and microstructural characteristics of friction stir welded annealed pure copper joints were investigated. The influence of the tool rotation speed, welding speed and applied load was studied. The friction stir welding (FSW) was conducted at welding speed ranged from 30 to 70 mm/ min, rotation speed ranged from 400 to 1200rpm and applied load ranged from 1000 to 1500 kg. After welding process, tensile and Vickers hardness tests were performed. It has been found that increasing the tool rotational speed and/or reducing the welding speed increases heat input and causes grain coarsening in stir zone. High applied load refines the microstructure of NZ and increases the hardness and tensile strength of NZ. An optimum heat input condition was found to reach the best mechanical properties of the joints. The tensile characteristics of the friction stir welded tensile samples depend significantly on the tool rotation speed ,welding speed and applied load.

scholarly journals Optimum Rotation Speed for the Friction Stir Welding of Pure Copper

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Masoud Jabbari ◽  
Cem C. Tutum
Keyword(s):  
Grain Size ◽  
Friction Stir Welding ◽  
Yield Strength ◽  
Rotation Speed ◽  
Pure Copper ◽  
Traverse Speed ◽  
Tensile Tests ◽  
Friction Stir ◽  
Hardness Tests ◽  
Metallographic Images

The friction stir welding (FSW) was conducted in the pure copper plates with the thickness of 4 mm in the constant traverse speed of 25 mm/min and five different rotation speeds. Analysis of metallographic images showed that the increasing of the rotation speed results in the increase of grain size in the nugget zone. Vickers hardness tests were conducted on the weld samples and the maximum hardness obtained in rotation speed of 900 rpm. Results of the tensile tests and their comparison with that of the base metal showed that the maximum strength and the minimum elongation are achieved again in this rotation speed. Yield strength and ultimate tensile strength increased with the decrease in grain size in the nugget region, and the yield strength obeyed Hall-Petch relationship. Hence, the hardness values do not follow the relationship.

scholarly journals Effect of Stirring Pin Rotation Speed on Microstructure and Mechanical Properties of 2A14-T4 Alloy T-Joints Produced by Stationary Shoulder Friction Stir Welding

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1938
Author(s):  
Haifeng Yang ◽  
Hongyun Zhao ◽  
Xinxin Xu ◽  
Li Zhou ◽  
Huihui Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Rotation Speed ◽  
Weld Nugget ◽  
Al Alloy ◽  
Nugget Zone ◽  
T Joints ◽  
Friction Stir ◽  
Stationary Shoulder ◽  
Microstructure And Mechanical Properties

In this study, 2A14-T4 Al-alloy T-joints were prepared via stationary shoulder friction stir welding (SSFSW) technology where the stirring pin’s rotation speed was set as different values. In combination with the numerical simulation results, the macro-forming, microstructure, and mechanical properties of the joints under different welding conditions were analyzed. The results show that the thermal cycle curves in the SSFSW process are featured by a steep climb and slow decreasing variation trends. As the stirring pin’s rotation speed increased, the grooves on the weld surface became more obvious. The base and rib plates exhibit W- or N-shaped hardness distribution patterns. The hardness of the weld nugget zone (WNZ) was high but was lower than that of the base material. The second weld’s annealing effect contributed to the precipitation and coarsening of the precipitated phase in the first weld nugget zone (WNZ1). The hardness of the heat affect zone (HAZ) in the vicinity of the thermo-mechanically affected zone (TMAZ) dropped to the minimum. As the stirring pin's rotation speed increased, the tensile strengths of the base and rib plates first increased and then dropped. The base and rib plates exhibited ductile and brittle/ductile fracture patterns, respectively.

Effect of Friction Stir Welding on Electrochemical Behavior of Pure Copper

2016 ◽  
Vol 69 (7) ◽  
pp. 1423-1434 ◽  
Author(s):  
Arash Fattah-alhosseini ◽  
Amir Hossein Taheri ◽  
Mohsen K. Keshavarz
Keyword(s):  
Friction Stir Welding ◽  
Electrochemical Behavior ◽  
Pure Copper ◽  
Friction Stir
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