TY  - CONF
AU  - Odanović, Zoran
AU  - Arsić, Miodrag
AU  - Grabulov, Vencislav
AU  - Đurđević, Mile
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/215
AB  - Metal materials are subjected to innumerable time-dependent degradation mechanisms when operate in power, petrochemical and refinery plant. These materials are subjected to multiaxial stresses, creep, fatigue, corrosion and abrasion. As a result of service especially at high temperatures and high pressures, can lead to forming cracks, damages or failures. In situation of breakdown in such systems there is a need for weld repair on plant components and repair work can be expensive and time-consuming. Most weld repairs of low alloy steels require high-temperature post weld heat treatment (PWHT); but in certain repairs, however, this is not always possible. Expenses of the repair work could be reduced if the weld repairing is performed on site. Also, application of the nickel based filler metal can be alternative to performing PWHT. These repair welding procedures with Ni based filler metal could be categorized as cold repair welding. Purpose of presented investigation was to compare a repair welding technology with filler austenite material based on Ni and without application of the PWHT, with a classical repair welding procedure with preheating and PWHT and using a filler metal with chemical composition similar to parent metal. Properties comparison of the welded joints obtained by these two repair welding technologies was performed for the Cr-Mo steel (13CrMo4-5) by the metal arc welding procedure with covered electrode (MMA - 111). Weldability analysis by the analytical equations and technological tests for determination of the sensitivity to crack forming for cold and hot cracks by the CTS and Y tests, were performed for both repair welding technologies. Tensile tests, absorbed energies tests, banding tests and hardness measurements were performed on trial joins. Light optical microscopy (LOM) was applied for microstructure analysis. The fracture toughness of welded joints obtained by both investigated technologies, were estimated by the calculated stress intensity factor KIc and dynamic stress intensity factor KId for weld metal and heat affected zone. All of the obtained results were analyzed and discussed. It was concluded that repair welding technology with Ni base filler material without PWHT, enables welded joints without the appearance of cracks, with a good mechanical properties, slightly higher hardness in the HAZ, but with lower expenses compared to standard repair welding technology. In applying this technology in emergency welding repairing on-site, on the equipment and industrial facilities with high security requirements, inspection using non destructive technique has to be frequently applied compared to standard procedures.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Structural Integrity of Welded Structures
T1  - Investigation of the Repair Welding Technology Using Ni Base Electrode
EP  - 32
SP  - 25
VL  - 814
DO  - 10.4028/www.scientific.net/AMR.814.25
ER  - 

@conference{
author = "Odanović, Zoran and Arsić, Miodrag and Grabulov, Vencislav and Đurđević, Mile",
year = "2013",
abstract = "Metal materials are subjected to innumerable time-dependent degradation mechanisms when operate in power, petrochemical and refinery plant. These materials are subjected to multiaxial stresses, creep, fatigue, corrosion and abrasion. As a result of service especially at high temperatures and high pressures, can lead to forming cracks, damages or failures. In situation of breakdown in such systems there is a need for weld repair on plant components and repair work can be expensive and time-consuming. Most weld repairs of low alloy steels require high-temperature post weld heat treatment (PWHT); but in certain repairs, however, this is not always possible. Expenses of the repair work could be reduced if the weld repairing is performed on site. Also, application of the nickel based filler metal can be alternative to performing PWHT. These repair welding procedures with Ni based filler metal could be categorized as cold repair welding. Purpose of presented investigation was to compare a repair welding technology with filler austenite material based on Ni and without application of the PWHT, with a classical repair welding procedure with preheating and PWHT and using a filler metal with chemical composition similar to parent metal. Properties comparison of the welded joints obtained by these two repair welding technologies was performed for the Cr-Mo steel (13CrMo4-5) by the metal arc welding procedure with covered electrode (MMA - 111). Weldability analysis by the analytical equations and technological tests for determination of the sensitivity to crack forming for cold and hot cracks by the CTS and Y tests, were performed for both repair welding technologies. Tensile tests, absorbed energies tests, banding tests and hardness measurements were performed on trial joins. Light optical microscopy (LOM) was applied for microstructure analysis. The fracture toughness of welded joints obtained by both investigated technologies, were estimated by the calculated stress intensity factor KIc and dynamic stress intensity factor KId for weld metal and heat affected zone. All of the obtained results were analyzed and discussed. It was concluded that repair welding technology with Ni base filler material without PWHT, enables welded joints without the appearance of cracks, with a good mechanical properties, slightly higher hardness in the HAZ, but with lower expenses compared to standard repair welding technology. In applying this technology in emergency welding repairing on-site, on the equipment and industrial facilities with high security requirements, inspection using non destructive technique has to be frequently applied compared to standard procedures.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Structural Integrity of Welded Structures",
title = "Investigation of the Repair Welding Technology Using Ni Base Electrode",
pages = "32-25",
volume = "814",
doi = "10.4028/www.scientific.net/AMR.814.25"
}

Odanović, Z., Arsić, M., Grabulov, V.,& Đurđević, M.. (2013). Investigation of the Repair Welding Technology Using Ni Base Electrode. in Structural Integrity of Welded Structures
Trans Tech Publications Ltd, Durnten-Zurich., 814, 25-32.
https://doi.org/10.4028/www.scientific.net/AMR.814.25

Odanović Z, Arsić M, Grabulov V, Đurđević M. Investigation of the Repair Welding Technology Using Ni Base Electrode. in Structural Integrity of Welded Structures. 2013;814:25-32.
doi:10.4028/www.scientific.net/AMR.814.25 .

Odanović, Zoran, Arsić, Miodrag, Grabulov, Vencislav, Đurđević, Mile, "Investigation of the Repair Welding Technology Using Ni Base Electrode" in Structural Integrity of Welded Structures, 814 (2013):25-32,
https://doi.org/10.4028/www.scientific.net/AMR.814.25 . .

TY  - JOUR
AU  - Odanović, Zoran
AU  - Grabulov, Vencislav
AU  - Arsić, Miodrag
AU  - Đurđević, Mile
AU  - Katavić, Boris
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/130
AB  - Najznačajniji delovi hidroelektrana, vratila turbina izložena su tokom rada visokim naprezanjima, puzamju, zamoru i koroziji. Zbog toga je korisno preduprediti oštećenja tokom rada, povećati pouzdanost i produžiti radni vek postrojenja. Eksploatacioni uslovi mogu da dovedu do prslina i loma u homogenom materijalu, tako da postoji potreba za reparaturom dela postrojenja. A ona može biti skupa ili dugotrajna. U okolnostima kada se reparatura izvodi na licu mesta, posebno pažljivo treba da se definiše tehnologija reparaturnog zavarivanja, parametri postupka, i izbor dodatnog materijala. U ovom istraživanju izbor dodatnog materijala je bio tema i dati su rezultati. Vratilo je izrađeno od čeličnog liva 20Mn5 i na njemu su metodama IBR, otkrivena oštećenja tipa prslina dužine do 400 mm i dubine do 20 mm. Kako je planirano da se reparatura izvede bez demontaže vratila, primena termičke obrade nije bila izvodljiva. Analiza zavarljivosti osnovnoog materijala urađena je korišćenjem analitičkih jednačina. Rezultati su pokazali da je zavarljivost ovog čelika ograničena. Za reparaturno zavarivanje izabran je postupak REL (111) i dve obložene austenitne elektrode sa ciljem određivanja pogodnosti za upotrebu kao potencijalnih dodatnih materijala za reparaturu. U ovom istraživanju ispitane su Fe-Ni-Cr-Mo elektroda i elektroda na bazi Ni i njihove osobine su upoređene. Ispitivanje zatezanjem, ispitivanje apsorbovane energije, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe, izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, 20Mn5, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, čelika 20Mn5, sa ispitivanim dodatnim materijalima. Dobijeni rezultati su analizirani i na osnovu toga, odabrana je elektroda na bazi Ni kao pogodnija za reparaturno zavarivanje.
AB  - The most significant components of hydropower plants are turbine shafts and generator rotors which undergo time-dependent processes such as high stresses, creep, fatigue and corrosion. It is therefore desirable to prevent in-service damages, improve reliability and extend the operational life of the plant. Plant operation can lead to cracking and failures in homogeneous materials, therefore a need for repair welding on plant components, which can be expensive and time-consuming, exists. In the circumstances when repair welding has to be carried out on site, special care has to be taken in defining repair welding technology, process parameters and selection of filler materials. In this research a selection of filler materials for repair welding on site of hydropower turbine shaft was performed and results were presented. The shaft was made of the cast steel 20Mn5 and presence of damages in the form of cracks which were up to 400 mm long and up to 20 mm deep was detected through the use of NDT methods. As the repairing was planned to be carried out without disassembling of the shaft, application of heat treatment procedures was not feasible. Weldability analysis of the base material was performed through the use of analytical equations. Results have shown that weldability of this steel is limited. For the repair welding a MMA (111) welding process was selected and two covered austenitic electrodes were analyzed in order to establish the feasibility of their use as potential filler material for repairing. In this research a Fe-Ni-Cr-Mo electrode and Ni based electrode were tested and their properties were compared. Tensile testing, absorbed energies tests, bending tests, hardness measurements and sensitivity tests such as 'CTS' and 'Y' were performed on test joints obtained by welding of base material, 20Mn5 steel, with investigated filler materials. Obtained results were analyzed and a Ni based electrode was selected as most suitable for repair welding.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta
T1  - Selection of the optimal filler material for on-site repair welding of the turbine shaft at the hydropower plant
EP  - 166
IS  - 4
SP  - 149
VL  - 56
UR  - https://hdl.handle.net/21.15107/rcub_rims_130
ER  - 

@article{
author = "Odanović, Zoran and Grabulov, Vencislav and Arsić, Miodrag and Đurđević, Mile and Katavić, Boris",
year = "2011",
abstract = "Najznačajniji delovi hidroelektrana, vratila turbina izložena su tokom rada visokim naprezanjima, puzamju, zamoru i koroziji. Zbog toga je korisno preduprediti oštećenja tokom rada, povećati pouzdanost i produžiti radni vek postrojenja. Eksploatacioni uslovi mogu da dovedu do prslina i loma u homogenom materijalu, tako da postoji potreba za reparaturom dela postrojenja. A ona može biti skupa ili dugotrajna. U okolnostima kada se reparatura izvodi na licu mesta, posebno pažljivo treba da se definiše tehnologija reparaturnog zavarivanja, parametri postupka, i izbor dodatnog materijala. U ovom istraživanju izbor dodatnog materijala je bio tema i dati su rezultati. Vratilo je izrađeno od čeličnog liva 20Mn5 i na njemu su metodama IBR, otkrivena oštećenja tipa prslina dužine do 400 mm i dubine do 20 mm. Kako je planirano da se reparatura izvede bez demontaže vratila, primena termičke obrade nije bila izvodljiva. Analiza zavarljivosti osnovnoog materijala urađena je korišćenjem analitičkih jednačina. Rezultati su pokazali da je zavarljivost ovog čelika ograničena. Za reparaturno zavarivanje izabran je postupak REL (111) i dve obložene austenitne elektrode sa ciljem određivanja pogodnosti za upotrebu kao potencijalnih dodatnih materijala za reparaturu. U ovom istraživanju ispitane su Fe-Ni-Cr-Mo elektroda i elektroda na bazi Ni i njihove osobine su upoređene. Ispitivanje zatezanjem, ispitivanje apsorbovane energije, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe, izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, 20Mn5, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, čelika 20Mn5, sa ispitivanim dodatnim materijalima. Dobijeni rezultati su analizirani i na osnovu toga, odabrana je elektroda na bazi Ni kao pogodnija za reparaturno zavarivanje., The most significant components of hydropower plants are turbine shafts and generator rotors which undergo time-dependent processes such as high stresses, creep, fatigue and corrosion. It is therefore desirable to prevent in-service damages, improve reliability and extend the operational life of the plant. Plant operation can lead to cracking and failures in homogeneous materials, therefore a need for repair welding on plant components, which can be expensive and time-consuming, exists. In the circumstances when repair welding has to be carried out on site, special care has to be taken in defining repair welding technology, process parameters and selection of filler materials. In this research a selection of filler materials for repair welding on site of hydropower turbine shaft was performed and results were presented. The shaft was made of the cast steel 20Mn5 and presence of damages in the form of cracks which were up to 400 mm long and up to 20 mm deep was detected through the use of NDT methods. As the repairing was planned to be carried out without disassembling of the shaft, application of heat treatment procedures was not feasible. Weldability analysis of the base material was performed through the use of analytical equations. Results have shown that weldability of this steel is limited. For the repair welding a MMA (111) welding process was selected and two covered austenitic electrodes were analyzed in order to establish the feasibility of their use as potential filler material for repairing. In this research a Fe-Ni-Cr-Mo electrode and Ni based electrode were tested and their properties were compared. Tensile testing, absorbed energies tests, bending tests, hardness measurements and sensitivity tests such as 'CTS' and 'Y' were performed on test joints obtained by welding of base material, 20Mn5 steel, with investigated filler materials. Obtained results were analyzed and a Ni based electrode was selected as most suitable for repair welding.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta, Selection of the optimal filler material for on-site repair welding of the turbine shaft at the hydropower plant",
pages = "166-149",
number = "4",
volume = "56",
url = "https://hdl.handle.net/21.15107/rcub_rims_130"
}

Odanović, Z., Grabulov, V., Arsić, M., Đurđević, M.,& Katavić, B.. (2011). Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 56(4), 149-166.
https://hdl.handle.net/21.15107/rcub_rims_130

Odanović Z, Grabulov V, Arsić M, Đurđević M, Katavić B. Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta. in Zavarivanje i zavarene konstrukcije. 2011;56(4):149-166.
https://hdl.handle.net/21.15107/rcub_rims_130 .

Odanović, Zoran, Grabulov, Vencislav, Arsić, Miodrag, Đurđević, Mile, Katavić, Boris, "Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta" in Zavarivanje i zavarene konstrukcije, 56, no. 4 (2011):149-166,
https://hdl.handle.net/21.15107/rcub_rims_130 .

TY  - JOUR
AU  - Katavić, Boris
AU  - Jegdić, Bore
AU  - Odanović, Zoran
AU  - Đurđević, Mile
AU  - Hut, Nenad
AU  - Mladenović, Mladen
AU  - Jaković, Dragan
PY  - 2009
UR  - http://rims.institutims.rs/handle/123456789/95
AB  - Čelik 13CrMo 4-5 (~Č7400) već dugi niz godina se primenjuje za izradu delova termoenergetskih postrojenja kao što su elementi kotlova i cevi. On spada u grupu niskolegiranih konstrukcionih čelika za rad na povišenim temperaturama do 600°C. Čelik 13CrMo 4-5 pripada grupi uslovno zavarljivih čelika, koji mogu uspešno da se zavaruju uz primenu posebnih mera, kao što su predgrevanje, termička obrada nakon zavarivanja i drugih mera predostrožnosti, a zavaruje se sa dodatnim materijalima sličnog hemijskog sastava. U ovom radu je izvršena procena zavarljivosti osnovnog materijala na osnovu analitičkih jednačina i izvršena su ispitivanja na osnovu tehnoloških proba osetljivosti na pojavu prslina (Y i CTS). Kao dodatni materijali u ispitivanjima su korišćene elektrode sličnog hemijskog sastava (Castolin 71D) i austenitne elektrode na bazi nikla (Castolin 2222 Xuper Nucleo Tec). Dobijeni preliminarni rezultati ukazuju, da u slučajevima interventnih popravki zavarivanjem bez dodatne termičke obrade, ne treba koristiti klasične dodatne materijale, zbog mogućnosti pojave prslina u zavarenom spoju, osim u slučaju primene tehnologije sa kontrolisanim unosom toplote, kao i da bi se za interventna zavarivanja mogle koristiti elektrode na bazi nikla, u ovom slučaju Castolin 2222 Xuper Nucleo Tec.
AB  - Over the years steel 13CrMo 4-5 (~Č7400) is applied for production of the parts as pressure vessels and pipes in thermo energetic plants. This steel is from the group of the low alloyed constructional steels for application on elevated temperatures up to 600°C. Steel 13CrMo 4-5 is conditionally weldable steel and could be successfully welded with the special care and application of preheating, post weld heat treating and other precautionary measures. It is usually welded with similar filler material. In consideration to specific application, at repair welding special care have to be taken in defining weld process parameters and selection of filler materials. In this investigations a estimation of the weldability of the steel 13CrMo 4-5 is performed on the base of the analytical equations and technological tests for the crack sensitivities (Y and CTS tests). As filler material a electrodes with similar chemical composition (Castolin 71D) and austenite nickel based alloy (Castolin 2222 Xuper Nucleo Tec) were used. Preliminary results has shown that in case of the emergency repair welding with similar filler material without PWHT, a cracks could be formed in welded joint and application of the controlled deposition method have to be applied. Also, a filler material based on nickel as Castolin 2222 Xuper Nucleo Tec, could be applied.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Analitička procena mogućnosti primene interventnog reparaturnog zavarivanja čelika 13CrMo 4-5
T1  - Analytical estimation of the application potentials for the emergency repair welding of the 13CrMo 4-5 steel
EP  - 155
IS  - 4
SP  - 149
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_rims_95
ER  - 

@article{
author = "Katavić, Boris and Jegdić, Bore and Odanović, Zoran and Đurđević, Mile and Hut, Nenad and Mladenović, Mladen and Jaković, Dragan",
year = "2009",
abstract = "Čelik 13CrMo 4-5 (~Č7400) već dugi niz godina se primenjuje za izradu delova termoenergetskih postrojenja kao što su elementi kotlova i cevi. On spada u grupu niskolegiranih konstrukcionih čelika za rad na povišenim temperaturama do 600°C. Čelik 13CrMo 4-5 pripada grupi uslovno zavarljivih čelika, koji mogu uspešno da se zavaruju uz primenu posebnih mera, kao što su predgrevanje, termička obrada nakon zavarivanja i drugih mera predostrožnosti, a zavaruje se sa dodatnim materijalima sličnog hemijskog sastava. U ovom radu je izvršena procena zavarljivosti osnovnog materijala na osnovu analitičkih jednačina i izvršena su ispitivanja na osnovu tehnoloških proba osetljivosti na pojavu prslina (Y i CTS). Kao dodatni materijali u ispitivanjima su korišćene elektrode sličnog hemijskog sastava (Castolin 71D) i austenitne elektrode na bazi nikla (Castolin 2222 Xuper Nucleo Tec). Dobijeni preliminarni rezultati ukazuju, da u slučajevima interventnih popravki zavarivanjem bez dodatne termičke obrade, ne treba koristiti klasične dodatne materijale, zbog mogućnosti pojave prslina u zavarenom spoju, osim u slučaju primene tehnologije sa kontrolisanim unosom toplote, kao i da bi se za interventna zavarivanja mogle koristiti elektrode na bazi nikla, u ovom slučaju Castolin 2222 Xuper Nucleo Tec., Over the years steel 13CrMo 4-5 (~Č7400) is applied for production of the parts as pressure vessels and pipes in thermo energetic plants. This steel is from the group of the low alloyed constructional steels for application on elevated temperatures up to 600°C. Steel 13CrMo 4-5 is conditionally weldable steel and could be successfully welded with the special care and application of preheating, post weld heat treating and other precautionary measures. It is usually welded with similar filler material. In consideration to specific application, at repair welding special care have to be taken in defining weld process parameters and selection of filler materials. In this investigations a estimation of the weldability of the steel 13CrMo 4-5 is performed on the base of the analytical equations and technological tests for the crack sensitivities (Y and CTS tests). As filler material a electrodes with similar chemical composition (Castolin 71D) and austenite nickel based alloy (Castolin 2222 Xuper Nucleo Tec) were used. Preliminary results has shown that in case of the emergency repair welding with similar filler material without PWHT, a cracks could be formed in welded joint and application of the controlled deposition method have to be applied. Also, a filler material based on nickel as Castolin 2222 Xuper Nucleo Tec, could be applied.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Analitička procena mogućnosti primene interventnog reparaturnog zavarivanja čelika 13CrMo 4-5, Analytical estimation of the application potentials for the emergency repair welding of the 13CrMo 4-5 steel",
pages = "155-149",
number = "4",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_rims_95"
}

Katavić, B., Jegdić, B., Odanović, Z., Đurđević, M., Hut, N., Mladenović, M.,& Jaković, D.. (2009). Analitička procena mogućnosti primene interventnog reparaturnog zavarivanja čelika 13CrMo 4-5. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 54(4), 149-155.
https://hdl.handle.net/21.15107/rcub_rims_95

Katavić B, Jegdić B, Odanović Z, Đurđević M, Hut N, Mladenović M, Jaković D. Analitička procena mogućnosti primene interventnog reparaturnog zavarivanja čelika 13CrMo 4-5. in Zavarivanje i zavarene konstrukcije. 2009;54(4):149-155.
https://hdl.handle.net/21.15107/rcub_rims_95 .

Katavić, Boris, Jegdić, Bore, Odanović, Zoran, Đurđević, Mile, Hut, Nenad, Mladenović, Mladen, Jaković, Dragan, "Analitička procena mogućnosti primene interventnog reparaturnog zavarivanja čelika 13CrMo 4-5" in Zavarivanje i zavarene konstrukcije, 54, no. 4 (2009):149-155,
https://hdl.handle.net/21.15107/rcub_rims_95 .