Cornel HAŢIEGAN

32-34 CERCETĂRI ŞI EXPERIMENTĂRI PRIVIND OPTIMIZAREA REGIMULUI DE SUDARE CU ARC ELECTRIC PENTRU COMPONENTE DIN TABLĂ CU METODA GRADIENTULUI

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Cornel HAŢIEGAN Lenuţa CÎNDEA Octavian BARBU la de

RESEARCH AND EXPERIMENTATION ON OPTMIZING REGIME FOR WELDING COMPONENTS WITH

GRADIENT METHOD

 

The paper presents the calculation algorithm and the optimal solution calculated gradient method, an experimental program conducted on board the components of arc welding in the environment of protective gases. Welding regime parameters on variation conclusions have been drawn, then the gradient method was chosen optimum welding regime.

 

Keywords: welding duty, experimental program, algorithm, gradient method, optimization

Cuvinte cheie: regim de sudare, program experimental, algoritm, metoda gradientului, optimizare

 

30-15 CERCETĂRI PRIVIND REABILITAREA PIESELOR PRIN ÎNCĂRCARE CU SUDURĂ

Această intrare a fost publicată în 2016 Volumul 30 și etichetată Cornel HAŢIEGAN Cornelia Victoria ANGHEL DRUGĂRIN Cristian Marius MIMIS Lenuţa CÎNDEA Octavian BARBU la de

RESEARCH ON THE REHABILITATION OF PARTS
HARD SURFACING
The article presents a commonly used method for rehabilitation of parts
by welding load. The quality of rehabilitation is assessed by a set of
characteristics that give the reconditioned piece, the ability to meet the
necessary requirements, operating under normal conditions. Welding
instructions through material loading, are applied to the achievement of Francis
rotors type, on two components 1.4317 (GX4CrNi13-4)/SR EN 10213-2 cast
steel. These steels are ideal in terms of use conditions, where wear resistance
is really important, such as on hydraulic turbine components.
Keywords: rehabilitation, arc welded parts, charging by welding
Cuvinte cheie: reabilitare, piese sudate cu arc electric, încărcare prin
sudare

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25-64 STUDIUL COMPORTĂRII DINAMICE A STÂLPILOR CU DIFERITE NIVELE DE ÎNCĂRCARE

Această intrare a fost publicată în 2014 Revista Volumul 25 și etichetată Cornel HAŢIEGAN Florian MUNTEAN Gilbert Rainer GILLICH Vasile IANCU Zeno-Iosif PRAISACH la de

A STUDY REGARDING THE DYNAMIC BEHAVIOR OF
COLUMNS SUBJECTED TO DIFFERENT TIP MASSES
The present study aims to highlight the effect of a tip mass upon the
behavior of columns. We have first analytically determined, for a specific
column, the critical buckling force to find the range in which it works in the
elastic domain. Afterwards, by means of numerical simulations, we performed
analysis regarding the influence of loads due to different additional masses and
have identified the effect upon the natural frequencies and modal shapes,
concluding that the higher the mode number, the higher the influence.
Keywords: column, buckling, natural frequency, simulation
Cuvinte cheie: stâlp, flambaj, frecvenţe proprii, simulare
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25-63 EFECTUL DEFECTELOR STRUCTURALE ASUPRA COMPORTAMENTULUI DINAMIC AL GRINZILOR COMPOZITE STRATIFICATE

Această intrare a fost publicată în 2014 Revista Volumul 25 și etichetată Cornel HAŢIEGAN Daniela Elena BÎRDEANU Gilbert Rainer GILLICH Marius TUFOI Zeno-Iosif PRAISACH la de

EFFECT OF STRUCTURAL DAMAGES ON THE DYNAMIC
BEHAVIOUR OF LAMINATED BEAMS
This paper presents results obtained by modal analysis on composite
beam-like structures in healthy and damaged state. The aim is to obtain
damage “signatures” for all possible damage scenarios and to use these data
to assess transversal cracks based on vibration techniques, by involving natural
frequency shifts. The analysis was performed in SolidWorks software for a fivelayer
composite, 30 vibration modes being obtained by numerical simulations.
An example how to interpret the results is shown in the last section of the
paper.
Keywords: damage, finite elements, frequency, simulation, structure
Cuvinte cheie: defect, elemente finite, frecvenţă, simulare, structură
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25-56 STUDIU PRIVIND REPARAŢIA PRIN SUDARE A COMPONENTELOR DIN OŢEL MARTENSITIC ALE TURBINELOR HIDRAULICE

Această intrare a fost publicată în 2014 Revista Volumul 25 și etichetată Cornel HAŢIEGAN Cornelia ANGHEL-DRUGĂRIN Lenuţa CÎNDEA la de

STUDY ON REPAIR BY WELDING MARTENSITIC STEEL
COMPONENTS OF HYDRAULIC TURBINES
CA-6NM cast parts are frequently used in the manufacture of rotors and
turbines guiding equipment. CA-6NM material behaves better at casting and
improved weld ability compared to the stainless steel CA-15. During the
production process, rotor blades or their repairs hydraulic power operation have
identified four situations. These four cases have resulted to the design of
different welding repair technologies that are intended to meet the specific
conditions of each case.
Keywords: martensitic steel, welding, repairs, turbines
Cuvinte cheie: oţel martensitic, sudare, reparaţii, turbine
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