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The Influence of the Welding Process on the Ultrasonic Inspection of 9%Ni Steel Pipe Circumferential Welded Joints

Authors
  • da Cruz Payão Filho, João1
  • Kimus Dias Passos, Elisa1
  • Stohler Gonzaga, Rodrigo1
  • Drumond Santos, Daniel2
  • Pereira Maia, Vinicius2
  • Russo Juliano, Diego
  • 1 (R.S.G.)
  • 2 (V.P.M.)
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Feb 21, 2020
Volume
13
Issue
4
Identifiers
DOI: 10.3390/ma13040961
PMID: 32098044
PMCID: PMC7078718
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Green

Abstract

This work aims to compare the ultrasonic inspection of 9%Ni steel joints welded with the Gas Metal Arc Welding (GMAW) process and Shielded Metal Arc Welding (SMAW) process. These are the two most widely used processes used to weld pipes for CO2 injection units for floating production storage and offloading (FPSO) in the Brazilian oil and gas industry. The SMAW equipment is simple and portable, which is convenient for the FPSO; however, the GMAW process has the advantage of welding with high productivity. In this study we performed a numerical simulation using the software CIVA, 11th version, to analyze the behavior of ultrasonic longitudinal wave beams through GMAW and SMAW dissimilar weld joints. Ultrasonic tests were performed on calibration blocks drawn from both welded joints to evaluate the simulation results. The results are discussed with regard to the microstructure of the weld metal via electron backscatter diffraction (EBSD) analyses. The SMAW process presented better inspection performance than the GMAW process in terms of attenuation and dispersion effects. Although the SMAW had a better outcome, for both processes the configuration of 16 active elements and a scanning angle of 48° resulted in an optimized inspection of the entire joint.

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