NDLI: Effect of Interpass Temperature on Morphology, Microstructure and Microhardness of Welded API 5L X65 Steel

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Trevisan, R. E. Santos, N. F. Fals, H. C. Santos, A. A.
Copyright Year	2002
Abstract	The overwhelming bulk of oil and gas in pipeline construction is done by welding the individual joints of pipe together. In a broad sense, welding is a metal-joining process wherein coalescence is produced by heating to a suitable temperature. In pipeline construction, this temperature has to be sufficient to render fusion of the joint. The mechanical and metallurgical properties and distortions usually present in weld structures are strongly influenced by preheating and interpass temperatures that are applied during the welding process. Basically, interpass temperatures depend on two factors: composition of the material and cooling rate. It is very important to choose the correct interpass temperatures, however, this is not a completely dominating matter. The objective of this paper is to present a study on the effect of different interpass temperatures on morphology, microstructure and consequently on microhardness of welded API 5L X65 steel. The welds were deposited by a Flux Cored Arc Welding Process and the heat input was held constant during all welding production. The interpass temperatures were calculated by different methods. Such temperatures were later verified experimentally. Temperature data were collected via a data acquisition system. The geometry and microstructure characterizations were performed via light optical microscopy and image analysis. These data were related to the different thermal cycles obtained. The results showed that the morphology, the microstructure and the microhardness of welded API 5L X65 steel were strongly influenced by the interpass temperature, revealing how important it is to choose the appropriate value.
Sponsorship	Pipeline Division
Starting Page	327
Ending Page	331
Page Count	5
File Format	PDF
ISBN	0791836207
DOI	10.1115/IPC2002-27112
e-ISBN	0791836045
Volume Number	4th International Pipeline Conference, Parts A and B
Conference Proceedings	2002 4th International Pipeline Conference
Language	English
Publisher Date	2002-09-29
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Api 5l x65 Fcaw-g Interpass temperature Morphology Weld American petroleum institute Temperature Steel Microhardness
Content Type	Text
Resource Type	Article

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