Ioan ILCA


32-38 STAREA DE TENSIUNI ȘI DEFORMAȚII LA PERFORAREA ȚAGLELOR PENTRU ȚEVI FĂRĂ SUDURĂ

TENSION AND DEFORMATION state at billet perforation for seamless pipes

 

The paper analyses the particularities of perforation through helical rolling of filled billets to achieve blanks for seamless pipes. Also, clarify the plastic flow phenomenon caused by the stress and strain state, which determine the formation of the cavity.

 

Keywords: rolling helical cylinder bitronconic cavity, blanks, seamless, tubes (laminate tubes)

Cuvinte cheie: laminare elicoidală, cilindri bitronconici, cavitate, eboșe, țevi fără sudură (țevi laminate)

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32-36 FINISAREA EBOȘELOR PENTRU ȚEVI DESTINATE INDUSTRIEI PETROLIERE

finising blanks for pipes intended to oil industry

 

The paper analyses the Mannesmann process of blanks rolling into pipes of a certain wall thickness and diameter. Also, is focuses on pipes finishing in the size range of 400-900 mm for the exterior diameter, used for gas and petroleum products transportation.

 

Keywords: rough pipes, rolled widening, rolling on the cork, mill Smoothing, rolled pipes

Cuvinte cheie: eboșe pentru țevi, laminare de lărgire, laminare pe dop, laminor netezitor, laminare țevi

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30-14 PARTICULARITĂŢILE STRUCTURII ÎMBINĂRILOR LA SUDAREA MULTISTRAT

CHARACTERISTICS OF THE JOINTS STRUCTURE
AT MULTIPASS WELDING
The paper investigates the particularities of the welded joints structure at
multiphase welding, showing that the structure and properties of these joints is
not only influenced by the thermal action itself, but also by the metallurgical
phenomena from the metal subjected to welding.
Keywords: welded joints, thermal cycle, seam multilayer, heat wave
Cuvinte cheie: îmbinări sudate, ciclul termic, cusătură multistrat, undă
termică

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30-13 OPTIMIZAREA ÎNCĂLZIRII UNOR OŢELURI DE CALITATE ÎN VEDEREA PRELUCRĂRII PLASTICE

HEATING OPTIMIZATION OF HIGH GRADE STEELS
FOR PLASTIC PROCESSING
The research aimed at finding solutions for the dissolution in the
structural matrix of steel and the improvement in deformability. The results
allowed the optimization of the technology by reducing the heating-up duration,
and by dissoluting and globulising the ferrite.
Keywords: plastic processing, steel, structure
Cuvinte cheie: prelucrare plastică, oţel, structură

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26-59 INFLUENŢA STRUCTURII ASUPRA CALITĂŢII ŞI REZISTENŢEI LA OBOSEALĂ A ARBORILOR COTIŢI ÎN EXPLOATARE

INFLUENCE OF STRUCTURE ON THE QUALITY AND FATIGUE STRENGTH OF THE CRANKSHAFT IN SERVICE
This paper is based on experimental researches regarding the influence of structure on the quality and fatigue resistance in exploitation of crankshaft of large dimensions.
Keywords: fatigue, progressive braking, forging lines, fibber, metallographic structure, micrograph

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19-13 PRINCIPII DE EDUCARE ŞI PREGĂTIRE ÎN SPIRIT CREATOR A TINERETULUI STUDENŢESC

PRINCIPLES OF EDUCATING AND TRAINING IN THE
CREATIVE SPIRIT OF THE STUDENT YOUTH
We must gradually improve the organizational systems in order to
develop science, this means to improve the material base, to raise the quality of
teaching and increase the productivity in research work.
Keywords: youth, student, principles of education, science, technology
Cuvinte cheie: tineret studenţesc, principii de educare, ştiinţă,
tehnologie

13 PRINCIPII DE EDUCARE ŞI PREGĂTIRE ÎN SPIRIT