Vol.8, No2, 2008, pp. 81-98
UDC 621.774.2:669.15, 621.791.05:669.15-462

FABRICATION OF HIGH STRENGTH SEAM WELDED STEEL TUBES AND QUALITY INDICATOR TESTING

Živče Šarkočević 1

Miodrag Arsić 2

Marko Rakin 3

Aleksandar Sedmak 4

1 High Technical School of Professional Studies, Zvečan-Kosovska Mitrovica

2 Institute for Materials Testing – IMS, Belgrade

3 Faculty of Technology and Metallurgy, University of Belgrade

4 Faculty of Mechanical Engineering, University of Belgrade

Abstract

The selection of steel, the dimensions and methods of fabricating seam welded steel tubes are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life.

The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints.

In the paper are described quality indicator research results of seam welded tubes made of high strength steels X60 and J55, dedicated for producing oil and gas pipelines and in oil wells. Spiral welded tubes are produced by submerged arc welding (SAW), and the longitudinal welded pipes by high frequency welding technique.

Keywords: spiral welded tubes, longitudinal welded tubes, welding parameters, welded tubes testing, quality of welded joints

full article (1.04 MB)