scholarly journals Influence of Copper-Sided Tin Coating on the Weldability and Formation of Friction Stir Welded Aluminum-Copper-Joints

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 179 ◽  
Author(s):  
Nima Eslami ◽  
Yannik Hischer ◽  
Alexander Harms ◽  
Dennis Lauterbach ◽  
Stefan Böhm
Keyword(s):  
Tensile Strength ◽  
Electrical Properties ◽  
Base Material ◽  
Automotive Sector ◽  
Tin Coating ◽  
Excellent Performance ◽  
Friction Stir ◽  
Mechanical And Electrical Properties ◽  
Aluminum Base ◽  
Contact Spots

Although the joining of aluminum and copper is a difficult task, several studies have shown that friction stir welding (FSW) is capable of producing aluminum-copper-joints with excellent performance. Therefore, it is desirable to use this joining technique for the production of cost- and weight-reduced conductors for the automotive sector. The exposed copper contact spots in automobiles are usually coated with tin for design reasons and in order to improve their corrosion resistance. In this context, it is possible to perform the weld at first and to coat afterwards, or to weld already coated copper workpieces. Taking this into account, this paper presents results on the influence of copper-sided tinning on the joint formation as well as the achievable mechanical and electrical properties of friction stir butt welded aluminum-copper joints. Two variants were considered. The first variant included copper blanks with a tinned surface. For the second variant the surface and the abutting edge of the copper were coated. The best welds achieved excellent electrical properties and their tensile strength was only slightly reduced compared to the aluminum base material. Thus, it was shown that if these tensile strength losses are acceptable, FSW of aluminum to tin coated copper is applicable.

Influence of the Process Temperature on the Properties of Friction Stir Welded Blanks Made of Mild Steel and Aluminum

2014 ◽  
Vol 611-612 ◽  
pp. 1429-1436 ◽  
Author(s):  
Chris Mertin ◽  
Andreas Naumov ◽  
Linda Mosecker ◽  
Markus Bambach ◽  
Gerhard Hirt
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Mild Steel ◽  
Base Material ◽  
Welding Process ◽  
Process Temperature ◽  
Dissimilar Joints ◽  
Friction Stir ◽  
Temperature Range ◽  
Aluminum Base

Hybrid components made of steel and aluminum sheet metal are a promising approach for weight reduction for automotive applications. However, lightweight components made of steel and aluminum require suitable joining technologies, particularly if forming operations follow after the welding process. Friction Stir Welding (FSW) is a promising solid-state welding technology for producing dissimilar joints of steel and aluminum. Within this work dissimilar butt joints were produced using sheet metals of mild steel DC04 and the aluminum alloy AA6016 with a thickness of about 1 mm. The FSW joints show approximately 85 % of the tensile strength of the aluminum base material. In metallographic investigations of the produced FSW blanks it was found that the microstructure in the area of the weld seam changes in the aluminum alloy due to the process temperature and plastic deformation. Due to temperature dependent changes of precipitations of the aluminum alloy, temperature measurements have been carried out during the welding process. To find an explanation of the reduction in tensile strength of the FSW joints, short time heat treatment experiments in the temperature range between 250 °C and 450 °C were performed using the aluminum base material. Heat treatments in the temperature range of the measured process temperature result in a reduction of the tensile strength of about 20 % regardless the annealing time.

Effect of Friction Stir Welding Parameters on Thermal and Tensile Behavior of Aluminum Weldments Using Double Shoulder Tools

2012 ◽  
Vol 622-623 ◽  
pp. 323-329
Author(s):  
Ebtisam F. Abdel-Gwad ◽  
A. Shahenda ◽  
S. Soher
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Welding Process ◽  
Tensile Behavior ◽  
Frictional Heat ◽  
Welding Parameters ◽  
Friction Stir ◽  
Aluminum Base ◽  
Tool Pin ◽  
Strength And Ductility

Friction stir welding (FSW) process is a solid state welding process in which the material being welded does not melt or recast. This process uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters and tool pin profile play major roles in deciding the weld quality. In this investigation, an attempt has been made to understand effects of process parameters include rotation speeds, welding speeds, and pin diameters on al.uminum weldment using double shoulder tools. Thermal and tensile behavior responses were examined. In this direction temperatures distribution across the friction stir aluminum weldment were measured, besides tensile strength and ductility were recorded and evaluated compared with both single shoulder and aluminum base metal.

Study of Friction Stir Welding Technics and Weld Performance of Dissimilar 6063-3A21 Aluminum Alloys

2011 ◽  
Vol 299-300 ◽  
pp. 1095-1098 ◽  
Author(s):  
Lei Wang ◽  
Jian Jun Zhu ◽  
Wei Zhang ◽  
Xing Mei Feng ◽  
Zhan Ying Feng
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloys ◽  
Base Material ◽  
Post Weld Heat Treatment ◽  
Weld Strength ◽  
Welding Parameters ◽  
Friction Stir ◽  
Dissimilar Aluminum Alloys ◽  
Performance Results ◽  
Better Than

Several rotating rates and welding speeds were chosen to joint 6063/3A21 dissimilar aluminum alloys, tensile strength of the welds were measured to analyze effect of welding parameters on weld performance. Results show that tensile strength of the weld is better than the base material. Weld tensile strength will decrease under a too high or too low welding speed while effect of rotating rate on weld strength is relatively small. The weakest position is at heat affected zone at 3A21 side after T6 post weld heat treatment.

An investigation on the mechanical properties of friction stir welded polycarbonate/aluminium oxide nanocomposite sheets

2016 ◽  
Vol 49 (6) ◽  
pp. 498-512 ◽  
Author(s):  
Ali Doniavi ◽  
Saeedeh Babazadeh ◽  
Taher Azdast ◽  
Rezgar Hasanzadeh
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rotational Speed ◽  
Signal To Noise Ratio ◽  
Base Material ◽  
Travel Speed ◽  
Effective Parameter ◽  
Welding Parameters ◽  
Effective Parameters ◽  
Friction Stir

Although considerable progress has been made in recent years in field of polymer welding, challenges still remain in using a friction stir welding method to join polycarbonate (PC) composites. This research provides an investigation on the effect of welding parameters (tool’s travel and rotational speeds) on mechanical properties of PC nanocomposite weld lines. PC nanocomposites were prepared with different percentages of Al2O3 nanofiller using a twin screw extruder and injection moulded as sheets in order to ease the welding. Considering various parameters and their levels, optimization of Taguchi experimental design was carried out, an L16 orthogonal standard array was selected and the effective parameter was calculated using analysis of variance of the results. The results indicated that nanoalumina percentage is the most effective parameter on the tensile strength of weld and tool’s travel speed and rotational speed are next effective parameters, respectively. According to signal-to-noise ratio, maximum weld tensile strength (89.5% of base material) is revealed when nanoalumina percentage, tool’s travel speed and tool’s rotational speed were chosen as 1 wt%, 12 mm/min and 1250 r/min, respectively.

scholarly journals Microstructural and mechanical behavior of Al 6061/SiC-Al2O3 composites processed through friction stir processing

10.30544/495 ◽  
2020 ◽  
Author(s):  
Mohana Rao Chanamallu ◽  
K. Meera Saheb
Keyword(s):  
Tensile Strength ◽  
Friction Stir Processing ◽  
Base Material ◽  
Optical Microscope ◽  
Material Surface ◽  
Influence Of Process Parameters ◽  
Friction Stir ◽  
Maximum Tensile Strength ◽  
Al 6061 ◽  
Favorable Conditions

Metal Matrix Composite (MMC) reinforced in friction stir processing (FSP) has increased insights that can affectively attain the desired mechanical properties for the manufactured samples. The favorable conditions of carbides are considered for reinforcing the SiC particles into the Aluminum 6061. The methodology of fabricating Aluminum 6061 comprises of three materials, Al 6061-SiC-Al2O3. The experimental evaluation of the composite Aluminum 6061-SiC-Al2O3 includes the influence of process parameters on microhardness, tensile strength, and microstructure. As a result of the reinforcement of nanoparticles processed in FSP, the properties of composite material increased satisfactorily. The sample S3 observed to be having a maximum tensile strength of 185 MPa. The larger, the better condition is adopted to analyze the tensile strength of the fabricated samples. The optimum condition for maximum tensile strength was found at 900 RPM, 15 mm/min, and composition 3. The hardness profiles at different zones of friction stir processing (FSP), viz., Heat Affected Zone (HAZ), Thermo Mechanical Affected Zone (TMAZ), Nugget Zone (NZ) were examined. The characterization techniques deployed were optical microscope (OM), and scanning electron microscope (SEM) studies for microstructural behavior. The result shows that the reinforcements were tightly embedded into the base material surface. The spherical grains are formed in the reinforcement region.

scholarly journals Post corrosion tensile strength and failure of dissimilar friction stir welded aluminium alloys

2020 ◽  
Vol 326 ◽  
pp. 04008
Author(s):  
Madhav Raturi ◽  
Anirban Bhattacharya
Keyword(s):  
Tensile Strength ◽  
Aluminium Alloys ◽  
Base Material ◽  
Fracture Morphology ◽  
Stir Zone ◽  
Tensile Failure ◽  
Friction Stir ◽  
Corrosive Solution ◽  
Dissimilar Weld ◽  
Dissimilar Friction Stir Welding

The present study efforts towards appraising the effects of corrosion on the tensile and fracture behaviour of dissimilar friction stir welding (FSW) of aluminium alloys. Three different dissimilar FSW joints obtained between AA6061-T6 and AA7075-T651, AA6061-T6 and AA2014-T6, AA7075-T651 and AA2014-T6, using threaded pin profile with three flat faces (TIF) tool at rotational speed of 1200 rpm and welding speed of 98 mm/min. The maximum joint tensile strength was achieved for AA7075-AA2014 joints followed by AA6061-AA2014 and least recorded for AA6061-AA7075 for as obtained FSW joints (non-corroded). The joints are further immersed into a corrosive solution for 1, 2, 7 and 14 days duration. The corrosion occurred all over the joint but much accelerated rate of exfoliation corrosion exists away from stir zone near the confluence of heat affected zone and base material irrespective of the advancing or retreating side. With increase in corrosion time the location of tensile failure shifted towards corroded region (AA6061-T6) instead of stir zone in dissimilar weld joint AA6061-AA2014, whereas it remained unchanged for other two joints. The fractured surfaces of AA6061-AA2014 FSW joints reveals the articulated view of pits and fracture morphology advocating the loss in YS, UTS and % elongation with increases in immersion duration.

Microstructure and Cryogenic Mechanical Properties of AA5083 Joints Prepared by Friction Stir Welding

2014 ◽  
Vol 788 ◽  
pp. 243-248 ◽  
Author(s):  
Bao Kang Gu ◽  
Da Tong Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Tensile Testing ◽  
Base Material ◽  
Tensile Behavior ◽  
Planar Slip ◽  
Friction Stir ◽  
5083 Aluminum Alloy ◽  
Cryogenic Mechanical Properties

In this study, 5083 aluminum alloy plates with a thickness of 3mm are friction stir welded and the microstructure and mechanical properties of the joints were characterized. In particular, tensile behavior of the joints is examined at 77K. It is found that defect-free joints can be obtained under a tool rotational rate of 800rpm and a welding speed of 60mm/min. The friction stirring welds exhibit finer microstructure and higher hardness than that of the base material due to the grain refinement. The ultimate tensile strength (UTS) and elongation of the joints measured at 298K are 316MPa and 21.3%, which are nearly equal to those of the base material. With the tensile test temperature decreasing to 77K, UTS and elongation of both the base material and joints increase. Comparing with tensile testing at 298K, dimples on the fracture surface of the samples tested at 77K are more uniform in distribution. The improvement of the mechanical properties of specimens at low temperature is related to the inactivation of planar slip and the strengthening of strain hardening.

Effect of PPTA Fiber Morphology on the Performance of Paper-Based Functional Materials

2011 ◽  
Vol 236-238 ◽  
pp. 1453-1456 ◽  
Author(s):  
Mei Yun Zhang ◽  
Rui Huang ◽  
Zhao Qing Lu ◽  
Bin Yang ◽  
Tao Li
Keyword(s):  
Tensile Strength ◽  
Electrical Properties ◽  
Functional Materials ◽  
Dielectric Strength ◽  
Fiber Morphology ◽  
Mechanical And Electrical Properties ◽  
Tearing Strength

The beating characteristic of PPTA fiber and its influence on the performance of paper-based functional materials based on PPTA fiber and resin has been investigated in this study. The results show that the morphology of PPTA-pulp had significant influences on the mechanical and electrical properties of the composites. The sample contained with PPTA fiber of 35 °SR showed the increase in tensile strength, tearing strength and dielectric strength by 147.7%, 119.3% and 69.9% as compared with the untreated PPTA fiber.

Mechanical and Electrical Testing of Electrically Conductive Silicone Rubber

2008 ◽  
Vol 589 ◽  
pp. 179-184 ◽  
Author(s):  
László Valenta ◽  
Attila Bojtos
Keyword(s):  
Tensile Strength ◽  
Electrical Properties ◽  
Silicone Rubber ◽  
Material Properties ◽  
Food Industry ◽  
Construction Material ◽  
Mechanical Tests ◽  
Electrically Conductive ◽  
Mechanical And Electrical Properties ◽  
Conductive Silicone Rubber

Silicone rubber is an essential construction material in food industry, medicine and in some fields of mechanical engineering, because it has good mechanical, electrical, biological and other special properties. One needs to know these material properties in order to develop silicone sensors. We performed several standard measurements for rubber, like tensile strength, cyclic tensile, bending, fatiguing, stress relaxation tests etc. To investigate the electrical properties, we measured the resistance of silicone during the mechanical tests. The paper summarizes the newest results of our research in connection with mechanical and electrical properties of conductive silicone rubber.

scholarly journals Mechanical and Electrical Properties of Epoxy Composites Modified by Functionalized Multiwalled Carbon Nanotubes

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3325
Author(s):  
Paweł Smoleń ◽  
Tomasz Czujko ◽  
Zenon Komorek ◽  
Dominik Grochala ◽  
Anna Rutkowska ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Electrical Properties ◽  
Young’S Modulus ◽  
Multiwalled Carbon Nanotubes ◽  
Young's Modulus ◽  
Epoxy Composites ◽  
Multiwalled Carbon ◽  
Mechanical And Electrical Properties ◽  
Functionalized Multiwalled Carbon Nanotubes

This paper investigates the effect of multiwalled carbon nanotubes on the mechanical and electrical properties of epoxy resins and epoxy composites. The research concerns multiwalled carbon nanotubes obtained by catalytic chemical vapor deposition, subjected to purification processes and covalent functionalization by depositing functional groups on their surfaces. The study included the analysis of the change in DC resistivity, tensile strength, strain, and Young’s modulus with the addition of carbon nanotubes in the range of 0 to 2.5 wt.%. The effect of agents intended to increase the affinity of the nanomaterial to the polymer on the aforementioned properties was also investigated. The addition of functionalized multiwalled carbon nanotubes allowed us to obtain electrically conductive materials. For all materials, the percolation threshold was obtained with 1% addition of multiwalled carbon nanotubes, and filling the polymer with a higher content of carbon nanotubes increased its conductivity. The use of carbon nanotubes as polymer reinforcement allows higher values of tensile strength and a higher strain percentage to be achieved. In contrast, Young’s modulus values did not increase significantly, and higher nanofiller percentages resulted in a drastic decrease in the values of the abovementioned properties.

Sign in / Sign up

Export Citation Format

Share Document