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28 results on '"RONTESCU, C."'

3. Research of the ultrasonic testing parts reconditioned by welding

Author

Petriceanu, C., Dobrota, D., Rontescu, C., Dumitru-Titi Cicic, Chivu, O., and Teodorescu, O.

Subjects
lcsh:TN1-997, welding, crankshaft, reconditioning, ultrasonic testing, lcsh:Mining engineering. Metallurgy
Abstract

The paper presents the results obtained following the nondestructive ultrasonic testing of crankpin shaft of a crankshaft that were reconditioned by welding. After the ultrasonic testing, the reconditioned samples were cut and subjected to visual testing and microstructure examination. When the results obtained following the nondestructive tests were analyzed, it was observed that the ultrasonic nondestructive testing method is an efficient way to determine the conformity of the areas that were reconditioned by welding.

Published
2016

8. The effects of reconditioning by welding of crankshafts in automotive industry

Author

Chivu, O., Rontescu, C., Dumitru-Titi Cicic, and Balan, G.

Subjects
lcsh:TN1-997, welding, SMAW, WIG, metallographic structure, reconditioning, lcsh:Mining engineering. Metallurgy
Abstract

The reconditioning by welding process applied to the crankshafts in the automotive industry can be carried out by using various reconditioning technologies that are based on different welding parameters and processes. This paper presents a comparison between Shielded Metal Arc Welding (SMAW) and Welding in Gas (WIG) reconditioning processes from the perspective of the metallographic analysis conducted on the zones resulted after the depositing process. The heat cycle resulted during the two welding processes influences in a different manner the welding behavior of the base material due to the occurrence of micro-structural changes in the main zones of the deposit. The occurred structural changes may influence to a significant degree the operating behavior of the structures repaired by welding.

Published
2016

13. CHOOSING THE OPTIMUM MATERIAL FOR MAKING A BICYCLE FRAME.

Author

RONTESCU, C., CICIC, T. D., AMZA, C. G., CHIVU, O., and DOBROTĂ, D.

Subjects
*CARBON fibers, *WOLFRAMITE, *FINITE element method, *STRAINS & stresses (Mechanics), *MECHANICAL behavior of materials
Abstract

This paper presents the results obtained following the Finite Element Method (FEM) simulations on a bike frame made of 3 different materials, Al6061, Carbon Fiber and Ti6Al4V, in order to identify the optimum material for the manufacture of the respective frame. The parts of the frame made of Al6061, Ti6Al4V will be joined using the WIG method (wolfram inert gas). Considering the results obtained and following the experiments we can see that the optimum material for making the bike frame is Ti6Al4V, but the main impediment for the large-scale use of the material is the high cost [ABSTRACT FROM AUTHOR]

Published
2015

23. VALIDATION OF THE FINITE ELEMENT METHOD (FEM) IN CASE OF RECONDITIONING BY WELDING APPLIED TO CRANKSHAFTS

Author

Chivu, O., Dumitru-Titi Cicic, and Rontescu, C.

Subjects
lcsh:TN1-997, welding, FEM, crankshaft, shielded metal arc welding (SMAW), reconditioning, lcsh:Mining engineering. Metallurgy
Abstract

This paper presents the results of the practical trials carried out based on the calculation assumptions considered within the FEM of the reconditioning by welding of a crankshaft used in the automotive industry. For the validation of the analytical model it was considered the influence of the crankshaft fixing possibility as well as the influence of preheating temperatures on the structure of the deposited zone.

24. CHOOSING THE OPTIMUM MATERIAL FOR MAKING A BICYCLE FRAME

Author

Rontescu, C., Cicic, T. D., Amza, C. G., Chivu, O., and Dan Dobrota

Subjects
lcsh:TN1-997, FEM, stresses, displacements, bike, lcsh:Mining engineering. Metallurgy, materials
Abstract

This paper presents the results obtained following the Finite Element Method (FEM) simulations on a bike frame made of 3 different materials, Al6061, Carbon Fiber and Ti6Al4V, in order to identify the optimum material for the manufacture of the respective frame. The parts of the frame made of Al6061, Ti6Al4V will be joined using the WIG method (wolfram inert gas). Considering the results obtained and following the experiments we can see that the optimum material for making the bike frame is Ti6Al4V, but the main impediment for the large-scale use of the material is the high cost

27. THE INFLUENCE OF THE RECONDITIONING BY WELDING PROCESSES ON THE HARDNESS OF CRANKSHAFTS IN THE AUTOMOTIVE INDUSTRY.

Author

CHIVU, O., CICIC, D-T, RONTESCU, C., and VASILE, I-M

Subjects
*METAL fabrication, *WELDING industry, *JOINING processes, *SOLDER & soldering, *SEALING (Technology)
Abstract

One of the aims of our modern society is to reduce the car maintenance costs. The part that most frequently breaks down in the engine block is the crankshaft - in the main journal and crankpin journal areas. This paper presents the effects of welding inert-gas (WIG) and shielded metal arc welding (SMAW) on the hardness of the material in the zones subject to reconditioning, more specifically the hardness values in the deposited material layer, in the fusion line and the heat-affected zone (HAZ). [ABSTRACT FROM AUTHOR]

Published
2016

28. VALIDATION OF THE FINITE ELEMENT METHOD (FEM) IN CASE OF RECONDITIONING BY WELDING APPLIED TO CRANKSHAFTS.

Author

CHIVU, O., CICIC, D-T, and RONTESCU, C.

Subjects
*FINITE element method, *WELDING, *METALWORK, *METAL fabrication, *JOINING processes
Abstract

This paper presents the results of the practical trials carried out based on the calculation assumptions considered within the FEM of the reconditioning by welding of a crankshaft used in the automotive industry. For the validation of the analytical model it was considered the influence of the crankshaft fixing possibility as well as the influence of preheating temperatures on the structure of the deposited zone. [ABSTRACT FROM AUTHOR]

Published
2016

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