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1
Content available Effect of tool eccentricity on microstructure and properties of fsw joints made of Al 7075 T6 alloy
100%
Burek R. , Wydrzyński D. , Andres J. , Wrońska A.
Advances in Science and Technology. Research Journal
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2017
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tom Vol. 11, no 4
333--338
EN
The aim of this paper was to present preliminary results of researches conducted in PZL Mielec within the FAST_FSW project (INNOLOT program) on the influence of tool eccentricity on microstructure and mechanical properties of 1.6 mm and 0.8 mm thick Al 7075 T6 sheets joints. Samples were performed using CNC milling machine. The range of tool eccentricity was 0–0.3 mm, rotational speed and feed rate were variable. The influence of the applied welding parameters on microstructure and mechanical properties of joints was assessed on the basis of metallographic inspections and tensile tests. Microstructural observations have shown that the change of FSW tool eccentricity affects the weld geometry: the mixing zone depth, the weld width, or the shape of the contact line.
2
Content available The Influence of Tool Geometry for Refill Friction Stir Spot Welding (RFSSW) on Weld Properties During Joining Thin Sheets of Aluminum Alloys
100%
Łogin W. , Śliwa R. E. , Ostrowski R. , Andres J.
Archives of Metallurgy and Materials
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2019
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tom Vol. 64, iss. 3
975--981
EN
The paper presents the results of research on the modification of the face geometry of the refill friction stir spot welding tool sleeve for welding thin aluminum sheets with an Alclad and an oxide anode coating. The analysis of the impact of such modification on the process perform (tool motion parameters, temperature) and microstructure as well as mechanical strength of the lap joints were analyzed. The tests were carried out using aluminum alloy 2024-T3 sheets with thickness 1.27 mm. For comparative purposes,joints were also made using plates without an Alclad and without anodized coating with using unmodified tool and modified toolswith developed 3 variants of face geometry. The samples with the joint were subjected to metallographic and strength tests. It has been shown that the use of modified geometry has a decisive influence on the performance of the process and the effect of softening and mixing of materials in the zone of point connection.
3
Content available The Influence of Tool Geometry for Refill Friction Stir Spot Welding (RFSSW) on Weld Properties During Joining Thin Sheets of Aluminum Alloys
100%
Łogin W. , Śliwa R. E. , Ostrowski R. , Andres J.
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4
Content available Energetic state of the postischemic myocardium and its relation to contractile failure
100%
Andres J. , Flameng W. , Van Belle H.
Journal of Physiology and Pharmacology
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1994
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tom 45
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nr 1
5
Content available EFFECT OF PROCESS PARAMETERS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF RFSSW LAP JOINTS OF THIN AL7075-T6 SHEETS
88%
Andres J. , Wrońska A. , Gałaszczyński T. , Luty G. , Burek R.
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6
Content available Effect of Process Parameters on Microstructure and Mechanical Properties of RFSSW Lap Joints of Thin Al7075-T6 Sheets
88%
Andres J. , Wrońska A. , Gałaczyński T. , Luty G. , Burek R.
Archives of Metallurgy and Materials
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2018
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tom Vol. 63, iss. 1
39--43
EN
Refill friction stir spot welding (RFSSW) is a new technique of metal structures joining. Within the framework of activities of PZL Mielec in R&D area (program Innolot) researches are realized which aim is to develop the RFSSW technology as a method of joining thin aluminum elements used in aircrafts constructions. The paper presents results of investigations on the RFSSW lap joints welded using rotations in the range from 1500 to 2000 rpm and tool sleeve plunge depth from 1.6 to 1.8 mm. Thin aluminum sheets of thickness 0.8 and 1.6 mm coated with alclad or anodized were welded. Results of the investigations prove that the most common cause of specimens breaking was presence of geometrical defect – the so called hook and weak bonding between parent material and working area of internal sleeve of RFSSW tool. The best tensile strength was reached in case of joint welded at rotational speed 2000 rpm and tool plunge depth 1.6 mm and 1.7 mm (5.37 kN and 5.87 kN adequately). These joints were characterized by very fine and uniform microstructure in the area between sleeve stirred zone and parent material.
7
Content available Reperfusion after brief repetitive ischemia in porcine myocardium does not alter expression of creatine kinase MM or mitochondrial ATPase mRNAs1
75%
Andres J. , Sharma H. S. , Sassen L. M. A. , Duncker D. J. , Verdouw P. D. , Schaper W.
Journal of Physiology and Pharmacology
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1993
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tom 44
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nr 4
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