Double-Sided Welding as an Alternative for Joining Internally Clad Pipes

AbstractHigh strength steel pipes internally clad with nickel (Ni) superalloys are components widely used in the oil and gas industry in the production of rigid risers. The joining of clad pipes is carried out through a girth welding in which the joint is totally filled with a material similar to th...

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Bibliographic Details
Published in:Journal of pipeline systems 2020-05, Vol.11 (2)
Main Authors: Gonçalves e Silva, Régis Henrique, Riffel, Kauê Correa, da Paixão Carvalho, Leonardo, Kejelin, Norton Zanette
Format: Article
Language:English
Subjects:
Beads
Chemical composition
Defects
Filler metals
Gas metal arc welding
Gas tungsten arc welding
Heavy metals
High strength steels
Inspection
Joining
Nickel
Nickel base alloys
Oil and gas industries
Oil and gas industry
Organic chemistry
Pipes
Risers
Steel pipes
Steel wire
Substrates
Superalloys
Technical Papers
Tungsten
Welding
Wire ropes
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Summary:AbstractHigh strength steel pipes internally clad with nickel (Ni) superalloys are components widely used in the oil and gas industry in the production of rigid risers. The joining of clad pipes is carried out through a girth welding in which the joint is totally filled with a material similar to the internal clad. However, depending on a substrate’s mechanical strength, an undermatching condition is created. This work aims to develop and parameterize a double-sided welding as an alternative method of joining steel clad pipes, enabling the application of steel wire as filler metal. An American Petroleum Institute (API) X-65 pipe cladded with Inconel 625 was used as a sample. In order to reduce the girth welding difficulties, modern welding techniques, such as gas metal arc welding with controlled metallic transfer (GMAW CCC), and gas tungsten arc welding with dynamic wire feeding (GTAW-DF), were applied along with internal pipe inspection by videoscopy. Developments showcased welding beads without macroscopic defects and good appearance in the entire circumference. Chemical composition tests indicated low iron dilutions, around 2.8% in weight, on the internal Inconel 625 weld.
ISSN:1949-1190
1949-1204
DOI:10.1061/(ASCE)PS.1949-1204.0000452