TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Experimental Research on Welding Technology of X80 API 5L Steel Pipes
(Cercetări privind tehnologia de sudare a coductelor executate din oţel de înaltă rezistenţă X80 - API 5L)
Vol LXII • No. 4A/2010
Vlad Ulmanu*, Florentina Mateescu**
* Universitatea Petrol-Gaze din Ploieşti, Bd. Bucuresti, 39, Ploiesti
e-mail:vulmanu@upg-ploiesti.ro
** S.C.COIFER IMPEX S.R.L. Bucuresti
e-mail:florentina.mateescu@coifer.ro

 Keywords   steel pipe,electrodes, welding wire,welding technology.

 Abstract
As the world's energy demands continue to grow and new sources of fuel are sought, it's no surprise that contracting companies have begun to expand the use of stronger, more cost-effective materials to build longer and more pipelines - both onshore and offshore. Instead of X70 steel pipe, the standard in past years, material like X80 steel grade has become an increasingly common choice. This trend is especially prominent thus far in North America, China, Russia (K60 and K65) and EU ( L485 MB and L555 MB) with other areas of the world following closely behind. This investigation presents an experimental research methodology for optimal choice of filler material and welding parameters of Ř 172 x 17.5 mm pipe API 5L-X80 material. The aim of the research was to optimize welding parameters for three types of electrodes for manual metal arc welding (metal-arc welding with covered electrode, 111 as per EN 15609), and two types of solid wire for metal active gas welding, MAG, 135 as per EN 15609.

 Rezumat
Creşterea continuǎ a nevoilor energetice ale lumii moderne a dus la cǎutarea de noi resurse naturale şi implicit la dezvoltarea de materiale noi necesare industriei extractive şi transportului acestor materii prime. Progresele în domeniul ştiinţelor materialelor conduc anual la îmbunătăţirea proprietăţilor unor materiale, respectiv la apariţia de noi materiale cu proprietăţi adaptate pentru a satisface exigenţele specifice acestei industrii. Astfel s-a trecut la înlocuirea ţevilor din oţeluri de clasa X65, X70, API 5L cu ţevi din otel de clasa X80 si X100, oteluri cu proprietǎţi fizico-mecanice mult îmbunǎtǎţite. Această tendinţă se manifestǎ atât in America de Nord, China, Rusia (K60 şi K65) cât şi în Uniunea Europeana (MB L485 şi L555 MB). Lucrare de faţǎ prezintă metodologia de cercetare experimentalǎ folositǎ pentru alegerea tehnologiei optime de sudare a ţevilor Ř 172 x 17.5 mm din material X80, API 5L. Scopul cercetării a fost de a optimiza parametrii de sudare pentru trei tipuri de electrozi, pentru sudare manuala cu arc electric cu electrod invelit, 111 conform EN 15609, şi două tipuri de sârme pline pentru sudarea cu arc electric în mediu protector de gaz activ, MAG, 135 conform EN 15609.



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