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Izborna godi{nja skup{tina Hrvatskog metalur{kog dru{tva Annual Election Annual Assambly of Croatian Metallurgical Society Zastupnici iz Hrvatske, Slovenije, Slova~ke, ê{ke, Poljske, Njema~ke, Rusije, Ukraine Delegate from Croatia, Slovenia, Slovakia, Czech Republic, Poland, Germany, Russia, Ukraine REZULTATI/RESULTS: Predsjednik Hrvatskog metalur{kog dru{tva 2010.-2014. – Akad. Ilija Mamuzi} President of Croatian Metallurgical Society 2010-2014 – Acad. Ilija Mamuzi} Upravni odbor / Menagement Board: Prof. dr. sc. Milan Ikoni} – Tehni~ki fakultet Rijeka / Technical Faculty Rijeka – Podpredsjednik / Vice President Prof. dr. Mrian Bur{ak – Metalur{ki fakultet Tehni~ko sveu~ili{te Ko{ice / Faculty of Metallurgy Tehnical University of Ko{ice, Slovakia – Zastupnik za ~lanove iz inozemstva / Delegate of members from the abroad B. sc. Jasenka \uki} – Tajnica / Secrerary B. Sc. Dubravko Novak – ^lan / Member, Vatrostalna Sisak d.o.o. Acad. Ilija Mamuzi} – Predsjednik / President 330 METALURGIJA 49 (2010) 4, 330
S. CVETKOVSKI, V. GRABULOV, Z. ODANOVIC, D. SLAVKOV OPTIMIZATION OF WELDING PARAMETERS FOR GAS TRANSPORTATION STEEL PIPES INTRODUCTION Steel pipes still have the main roll in petrochemical industry. Submerged Arc Welding (SAW) process could be treated as one of the most important processes for obtaining longitudinally welded steel pipes, mainly due to the very good quality of welded joints and high productivity. However the defects in welded joints often lead to damage of installations and even more dangerous - human victims 1-3. Therefore the optimization of welding parameters is the most important task in order to obtain welded pipes with high exploitation safety, which is also the main aim of the investigations presented in this paper. SETUP OF EXPERIMENT Steel plates of 8 mm thickness with designation X-52, were used as a base material for the production of welded pipes for gas transportation. Specification of steels for pipeline production, for petrochemical indus- ISSN 0543-5846 METABK 49(4) 331-334 (2010) UDC – UDK 621.791.75:643.2-034.14 =111 Received – Prispjelo: 2009-09-22 Accepted – Prihva}eno: 2009-11-05 Preliminary Note – Prethodno priop}enje The aim of this paper is to define optimization of welding conditions for Submerged Arc Welding (SAW) of steel pipes for gas transportation. Fine grain steel X-52 with thickness of 8 mm were used as a base material. Welding was performed from inner and outer side. Two wires, inclined under different angles, were feed separately. Eleven samples divided in three series were experimentally welded. Performed investigations indicated that the best properties showed weldments from series III, welded with the highest heat input. On the contrary of our expectations, welds from series II, using self made equipment, showed pretty bead properties and improper geometry. So, improving of this this equipment and obtaining welds with better properties is the target in future investigations. Key words: welding parameters, microalloyed steel, tandem process Optimizacija parametra zavarivanja ~eli~nih cijevi za plinovode. Cilj ovog rada je definirati optimizaciju parametara zavarivanja pod pra{kom ~eli~nih cijevi za plinovode. Finozrnati ~elik X-52 debljine 8 mm je kori{ten kao osnovni materijal. Zavarivanje je izvedeno s vanjske i unutarnje strane. Dvije ìce, pod razli~itim kutom su dodavane odvojeno. Jedanaest uzoraka, podeljenih u tri serije ekserimentalno je zavareno. Ispitivanja su pokazala da najbolja svojstva imaju zavari iz serije III, zavareni s najve}om koli~inom une{ene toplote. Suprotno o~ekivanjima, zavari iz serije II, kod kojih je kori{tena oprema koju su izradili autori rada, pokazali su vrlo lose karakteristike i neadekvatnu geometriju spoja. Stoga je osnovni cilj u sljede}im istrazivanjima pobolj{anje ove opreme u cilju dobijanja kvalitetnijih zavara. Klju~ne rije~i: parametri zavarivanja, mikrolegirani ~elik, zavarivanje s dvije ìce S. Cvetkovski, D. Slavkov, Faculty of Technology and Metallurgy, Skopje, Republic of Macedonia; V. Grabulov, Z. Odanovic, Institute for materials testing, Republic of Serbia try is in accordance with American standard API 5L 4. According to this standard, “X” represents longitudinally welded pipes, and “52” shows minimal tensile strength of 520 N/mm 2 . Chemical composition and mechanical properties of the base material are given in Tables 1 and 2. Prior to welding, plates of a base material were formed as pipe segments and tack welded using Shield Metal Arc Welding (SMAW) process with basic electrode, classified as E 42 4 B 32 H 5 according EN 499, ( 3,25 mm). SAW welding process was performed us- Table 1 Chemical composition of base material for pipeline production, steel X52 4 Chem. elem. C Si Mn P S Nb Ti Mas.% 0,059 0,27 0,9 0,007 0,013 0,023 0,01 Table 2 Mechanical properties of base material in rolling (R) and transverse (T) directions, steel X52 4 Re / N/mm 2 Rm / N/mm 2 A5 / % KV / J -40 °C R dir. 439 510 27,0 275, 301, 341, 305 T dir. 422 492 28,0 174, 170, 171, 171 METALURGIJA 49 (2010) 4, 331-334 331
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Page 3 and 4: Content - Sadràj Editorial Board o
Page 5 and 6: MINUTES ZAPISNIK Editorial Board of
Page 7 and 8: RULE BOOK OF THE JOURNAL METALURGIJ
Page 9 and 10: S. KUT A SIMPLE METHOD TO DETERMINE
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Page 17 and 18: S. KASTELIC et al.: PREDICTION OF N
Page 19 and 20: welded-on beads. This was result of
Page 21 and 22: J. MATUSIAK, A. WYCIŒLIK THE INFLU
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Page 27 and 28: O. HÍRE[, I. BARÉNY MECHANICAL PR
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Page 37 and 38: M. [I[KO KULI[ et al: ASSESSING THE
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Page 41 and 42: I. SAMARD@I] et al.: INFLUENCE OF T
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Page 51 and 52: A. YASAR: EFFECTS OF ALCOHOL-GASOLI
Page 53 and 54: M. SEKULI], Z. JURKOVI], M. HAD@IST
Page 55 and 56: M. SEKULI] et al.: THE INFLUENCE OF
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Page 61 and 62: vestigated are limited mainly in th
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Page 65 and 66: CONCLUSION D. MALIND@ÁK et al.: TH
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Page 71 and 72: G. KOSEC, G. KOVAÎ^, J. HODOLI^, B
Page 73 and 74: a = crack length (mm) N = number of

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