TY  - CONF
AU  - Jovičić, Radomir
AU  - Balać, Martina
AU  - Markez, Jernej
AU  - Pavlović, Danijel
AU  - Jovičić, Katarina
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6059
AB  - The cooling time in the temperature range of 800 - 500° C (t8/5) has a major impact on the structures that are formed in the heat affected zone of steel welded joints. Data on the optimum cooling time t8/5 for a particular steels can be found in the literature. Besides the shape of welded joint, the thickness and physical characteristics of the welded steel, welding process and parameters, such as amperage, voltage, welding speed and the preheating temperature also have the impact on the size of the cooling time t8 / 5. During the calculation of the actual value of the cooling time t8/5, which is obtained during the welding of the particular joint, as a rule, the assumption is that the amperage, voltage and welding speed on each section of the joint are equal to the average for the whole joint and that the temperature of the edges of the groove along the entire length are equal to the preheating temperature or inter pass temperature. Measuring of amperage and voltage during welding of a multi-pass butt - welded joint at the high strength steel, using the MIG process are presented in this paper. Results of the measurement showed that the
values of the amperage may differ significantly in certain sections of the weld, the average amperage in one part of the weld may be significantly different from the average value of the amperage in the second part of the same weld, and that both may be different from the average value of amperage for the entire weld. The influence of the changes in welding amperage on the amount of heat input and the size of cooling time t8/5 was analysed using numerical methods. It was concluded that, at certain sections of some of the weld, cooling time t8/5 goes beyond the given values, although the average values of the cooling time t8 / 5 for these welds are within the given values.
PB  - Innovation Center of Faculty of Mechanical Engineering, Belgrade
C3  - International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2017
T1  - Changes of parameters during welding of certain weld and their impact on cooling time in temperature range of 800 - 500° c
SP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6059
ER  - 

@conference{
author = "Jovičić, Radomir and Balać, Martina and Markez, Jernej and Pavlović, Danijel and Jovičić, Katarina",
year = "2017",
abstract = "The cooling time in the temperature range of 800 - 500° C (t8/5) has a major impact on the structures that are formed in the heat affected zone of steel welded joints. Data on the optimum cooling time t8/5 for a particular steels can be found in the literature. Besides the shape of welded joint, the thickness and physical characteristics of the welded steel, welding process and parameters, such as amperage, voltage, welding speed and the preheating temperature also have the impact on the size of the cooling time t8 / 5. During the calculation of the actual value of the cooling time t8/5, which is obtained during the welding of the particular joint, as a rule, the assumption is that the amperage, voltage and welding speed on each section of the joint are equal to the average for the whole joint and that the temperature of the edges of the groove along the entire length are equal to the preheating temperature or inter pass temperature. Measuring of amperage and voltage during welding of a multi-pass butt - welded joint at the high strength steel, using the MIG process are presented in this paper. Results of the measurement showed that the
values of the amperage may differ significantly in certain sections of the weld, the average amperage in one part of the weld may be significantly different from the average value of the amperage in the second part of the same weld, and that both may be different from the average value of amperage for the entire weld. The influence of the changes in welding amperage on the amount of heat input and the size of cooling time t8/5 was analysed using numerical methods. It was concluded that, at certain sections of some of the weld, cooling time t8/5 goes beyond the given values, although the average values of the cooling time t8 / 5 for these welds are within the given values.",
publisher = "Innovation Center of Faculty of Mechanical Engineering, Belgrade",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2017",
title = "Changes of parameters during welding of certain weld and their impact on cooling time in temperature range of 800 - 500° c",
pages = "9",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6059"
}

Jovičić, R., Balać, M., Markez, J., Pavlović, D.,& Jovičić, K.. (2017). Changes of parameters during welding of certain weld and their impact on cooling time in temperature range of 800 - 500° c. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2017
Innovation Center of Faculty of Mechanical Engineering, Belgrade., 9.
https://hdl.handle.net/21.15107/rcub_machinery_6059

Jovičić R, Balać M, Markez J, Pavlović D, Jovičić K. Changes of parameters during welding of certain weld and their impact on cooling time in temperature range of 800 - 500° c. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2017. 2017;:9.
https://hdl.handle.net/21.15107/rcub_machinery_6059 .

Jovičić, Radomir, Balać, Martina, Markez, Jernej, Pavlović, Danijel, Jovičić, Katarina, "Changes of parameters during welding of certain weld and their impact on cooling time in temperature range of 800 - 500° c" in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2017 (2017):9,
https://hdl.handle.net/21.15107/rcub_machinery_6059 .

TY  - JOUR
AU  - Jovičić, Radomir
AU  - Petronić, Sanja
AU  - Sedmak, Simon
AU  - Tatić, Uroš
AU  - Jovičić, Katarina
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1631
AB  - Tokom eksploatacije rezervoara za skladištenje tečnog ugljendioksida ukazala se potreba za ugradnjom dva nova priključka u jedno od danaca. Rezervoar je izrađen od mikrolegiranog čelika, a priključci od visokolegiranog austenitnog čelika. Za izradu novih priključaka izabrani su isti dodatni materijali i ista tehnologija zavarivanja, koji su korišćeni i pri izradi rezervoara. Ispitivanjima metodama bez razaranja zavarenih spojeva novih priključaka otkrivene su mikroprsline u zoni uticaja toplote mikrolegiranog čelika. Primenom postupka prikazanom u standardu BSI PD 6493 'Uputstvo za ocenu prihvatljivosti grešaka u zavarenim konstrukcijama', ocenjen je uticaj ovih mikroprslina na integritet zavarenih spojeva novih priključaka i time i na integritet rezervoara.
AB  - During the exploitation of tanks used for storing liquid carbon dioxide there was a need to install two new connectors on one of the lids. The tank is made of micro-alloyed steel and its connectors are made of high-alloyed austenite steel. The same welding technology and added materials are used for both the tank and connectors. Non-destructive testing methods of welded joints in new connectors revealed microcracks in the heat-affected zone of micro-alloyed steel. By applying the procedure given in standard BSI PD 6493 'Manual for assessment of acceptability of flaws in welded structures', it is possible to estimate the effect of these microcracks on the integrity of welded joints in new connectors, and therefore their effect on the integrity of the tank.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Ocena integriteta rezervoara sa mikroprslinama u zavarenom spoju
T1  - Integrity assessment of tanks with microcracks in welded joints
EP  - 136
IS  - 2
SP  - 131
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1631
ER  - 

@article{
author = "Jovičić, Radomir and Petronić, Sanja and Sedmak, Simon and Tatić, Uroš and Jovičić, Katarina",
year = "2013",
abstract = "Tokom eksploatacije rezervoara za skladištenje tečnog ugljendioksida ukazala se potreba za ugradnjom dva nova priključka u jedno od danaca. Rezervoar je izrađen od mikrolegiranog čelika, a priključci od visokolegiranog austenitnog čelika. Za izradu novih priključaka izabrani su isti dodatni materijali i ista tehnologija zavarivanja, koji su korišćeni i pri izradi rezervoara. Ispitivanjima metodama bez razaranja zavarenih spojeva novih priključaka otkrivene su mikroprsline u zoni uticaja toplote mikrolegiranog čelika. Primenom postupka prikazanom u standardu BSI PD 6493 'Uputstvo za ocenu prihvatljivosti grešaka u zavarenim konstrukcijama', ocenjen je uticaj ovih mikroprslina na integritet zavarenih spojeva novih priključaka i time i na integritet rezervoara., During the exploitation of tanks used for storing liquid carbon dioxide there was a need to install two new connectors on one of the lids. The tank is made of micro-alloyed steel and its connectors are made of high-alloyed austenite steel. The same welding technology and added materials are used for both the tank and connectors. Non-destructive testing methods of welded joints in new connectors revealed microcracks in the heat-affected zone of micro-alloyed steel. By applying the procedure given in standard BSI PD 6493 'Manual for assessment of acceptability of flaws in welded structures', it is possible to estimate the effect of these microcracks on the integrity of welded joints in new connectors, and therefore their effect on the integrity of the tank.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Ocena integriteta rezervoara sa mikroprslinama u zavarenom spoju, Integrity assessment of tanks with microcracks in welded joints",
pages = "136-131",
number = "2",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1631"
}

Jovičić, R., Petronić, S., Sedmak, S., Tatić, U.,& Jovičić, K.. (2013). Ocena integriteta rezervoara sa mikroprslinama u zavarenom spoju. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 13(2), 131-136.
https://hdl.handle.net/21.15107/rcub_machinery_1631

Jovičić R, Petronić S, Sedmak S, Tatić U, Jovičić K. Ocena integriteta rezervoara sa mikroprslinama u zavarenom spoju. in Integritet i vek konstrukcija. 2013;13(2):131-136.
https://hdl.handle.net/21.15107/rcub_machinery_1631 .

Jovičić, Radomir, Petronić, Sanja, Sedmak, Simon, Tatić, Uroš, Jovičić, Katarina, "Ocena integriteta rezervoara sa mikroprslinama u zavarenom spoju" in Integritet i vek konstrukcija, 13, no. 2 (2013):131-136,
https://hdl.handle.net/21.15107/rcub_machinery_1631 .

TY  - CONF
AU  - Jovičić, Radomir
AU  - Sedmak, Aleksandar
AU  - Sedmak, Stojan
AU  - Milović, Ljubica
AU  - Jovičić, Katarina
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1527
AB  - Posle pojave vodenih kapi na spoljašnjem zidu otvora za reviziju posude za skladištenje ugljen dioksida, detaljnom inspekcijom je otkrivena mreža prslina na prirubnici revizionog otvora, blizu zavarenog spoja između prirubnice i zida revizionog otvora. Pošto su kapljice uočene na spoljašnjoj strani, zaključuje se da su u pitanju prolazne prsline. Analizom broja i veličine prslina, oblika i dimenzija segmenta naprslog revizionog otvora, osobina primenjenog materijala i naponskog stanja, su doveli do zaključka da je radna sigurnost posude u opasnosti. Da bi se rešio ovaj problem, oštećena zona je morala da se ukloni, a oblik vrata revizionog otvora je morao da se rekonstruiše. Nakon obavljenih popravki, posuda za skladištenje je ponovo puštena u rad.
AB  - After the occurrence of water droplets on the manhole outer wall of a storage tank for carbon dioxide, by detailed inspection, a net of cracks is detected in the manhole flange, close to the welded joint between the flange and manhole mantle. Since the droplets are found on the outer side, it is concluded that the through cracks are in question. The analysis of the number and the size of cracks, form and dimensions of manhole cracked segment, the properties of the applied material and stress state has lead to the conclusion that operational safety of the tank is endangered. In order to solve the problem, the damaged zone had to be eliminated and the shape of the manhole neck needed to be redesigned. After performed repairs, the storage tank could be put into operation again.
PB  - Institut za ispitivanje materijala, Beograd
C3  - Structural Integrity and Life
T1  - Curenje posude za skladištenje CO2 od austenitnog čelika
T1  - Leakage of an austenitic steel CO2 storage tank
EP  - 108
IS  - 2
SP  - 105
VL  - 12
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2049
ER  - 

@conference{
author = "Jovičić, Radomir and Sedmak, Aleksandar and Sedmak, Stojan and Milović, Ljubica and Jovičić, Katarina",
year = "2012",
abstract = "Posle pojave vodenih kapi na spoljašnjem zidu otvora za reviziju posude za skladištenje ugljen dioksida, detaljnom inspekcijom je otkrivena mreža prslina na prirubnici revizionog otvora, blizu zavarenog spoja između prirubnice i zida revizionog otvora. Pošto su kapljice uočene na spoljašnjoj strani, zaključuje se da su u pitanju prolazne prsline. Analizom broja i veličine prslina, oblika i dimenzija segmenta naprslog revizionog otvora, osobina primenjenog materijala i naponskog stanja, su doveli do zaključka da je radna sigurnost posude u opasnosti. Da bi se rešio ovaj problem, oštećena zona je morala da se ukloni, a oblik vrata revizionog otvora je morao da se rekonstruiše. Nakon obavljenih popravki, posuda za skladištenje je ponovo puštena u rad., After the occurrence of water droplets on the manhole outer wall of a storage tank for carbon dioxide, by detailed inspection, a net of cracks is detected in the manhole flange, close to the welded joint between the flange and manhole mantle. Since the droplets are found on the outer side, it is concluded that the through cracks are in question. The analysis of the number and the size of cracks, form and dimensions of manhole cracked segment, the properties of the applied material and stress state has lead to the conclusion that operational safety of the tank is endangered. In order to solve the problem, the damaged zone had to be eliminated and the shape of the manhole neck needed to be redesigned. After performed repairs, the storage tank could be put into operation again.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Curenje posude za skladištenje CO2 od austenitnog čelika, Leakage of an austenitic steel CO2 storage tank",
pages = "108-105",
number = "2",
volume = "12",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2049"
}

Jovičić, R., Sedmak, A., Sedmak, S., Milović, L.,& Jovičić, K.. (2012). Curenje posude za skladištenje CO2 od austenitnog čelika. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 12(2), 105-108.
https://hdl.handle.net/21.15107/rcub_technorep_2049

Jovičić R, Sedmak A, Sedmak S, Milović L, Jovičić K. Curenje posude za skladištenje CO2 od austenitnog čelika. in Structural Integrity and Life. 2012;12(2):105-108.
https://hdl.handle.net/21.15107/rcub_technorep_2049 .

Jovičić, Radomir, Sedmak, Aleksandar, Sedmak, Stojan, Milović, Ljubica, Jovičić, Katarina, "Curenje posude za skladištenje CO2 od austenitnog čelika" in Structural Integrity and Life, 12, no. 2 (2012):105-108,
https://hdl.handle.net/21.15107/rcub_technorep_2049 .