NDLI: Study of the Burn-Through During In-Service Welding of T Joint Branch Connections

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Daei-Sorkhabi, A. H. Saeimi-Sadigh, M. A. Vakili-Tahami, F. Zehsaz, M. Behjat, B.
Copyright Year	2010
Abstract	In this paper, the effect of three main parameters: a) welding speed, b) cooling rate of fluid flow through the main pipe; and c) number of welding passes, have been studied to obtain an effective method to reduce the burn-through risk during the in-service welding of AISI-316 pipe branch connection to perform hot-tapping. In addition, important patents regarding the new methods of hot-tapping have been reviewed. To carry out numerical simulation, a 3D Finite Element (FE) based thermo-mechanical model has been developed. Using this model, thermo-mechanical stresses and temperature distribution along the main-pipe wall-thickness have been obtained with maximum and minimum allowable welding speeds; and with two high and low level of steam flow rate through the main pipe. The Von-Mises yield criterion using the temperature dependent yield stress has been used to check the main pipe failure during the welding process. The results show that current techniques, including API recommendations, which only rely on the observation of the main-pipe inner wall temperature, does not take into account the effect of mechanical or thermal stresses due to the inline pressure or other working parameters which have significant role in burn-through. In addition, the results show that the increase of welding speed reduces the risk of burn-through but it increases the risk of hot cracking. On the other hand, decreasing the steam flow rate has the opposite effect. It has also been shown that using smaller electrode size is the most effective way to decrease burn-through risk.
Sponsorship	International
Starting Page	335
Ending Page	344
Page Count	10
File Format	PDF
ISBN	9780791849163
DOI	10.1115/ESDA2010-25113
e-ISBN	9780791838778
Volume Number	ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 2
Conference Proceedings	ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis
Language	English
Publisher Date	2010-07-12
Publisher Place	Istanbul, Turkey
Access Restriction	Subscribed
Subject Keyword	American petroleum institute Cracking (materials) Patents Temperature distribution Temperature Cooling Welding Computer simulation Fluid dynamics Risk Wall thickness Flow (dynamics) Pressure Stress Thermomechanics Electrodes Wall temperature Fracture (process) Steam Finite element analysis Pipes Yield stress Failure Thermal stresses
Content Type	Text
Resource Type	Article

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