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Metallurgical reactions in welding of clad X60/X65 pipelines

Abstract

This work investigates the metallurgical changes occurring during
welding of clad pipes. Welded samples with and without a Ni-interlayer
between the clad and base metal (BM) were investigated by light
optical microscope, electron microprobe analysis and microhardness
measurements. The investigations have focused on the microstructure
and properties of the clad and BM close to the weld, in addition to the
root and hotpass. The results indicate that the presence of a Niinterlayer
prevents carbon diffusion across the BM-clad interface
during exposure to elevated temperatures, thus preventing the
formation of a hard and crack susceptible microstructure.

Category

Academic article

Language

English

Author(s)

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Norwegian University of Science and Technology
  • Equinor

Year

2015

Published in

ISOPE - International Offshore and Polar Engineering Conference. Proceedings

ISSN

1098-6189

Volume

2015-January

Page(s)

61 - 66

View this publication at Norwegian Research Information Repository