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The Influence of Diffusible Hydrogen in Weld Metal and Moisture Content Levels in Flux Related With Weld Metal Mechanical Properties in Submerged Arc Welding Process for Line Pipe Manufacturing

[+] Author Affiliations
Gautam Chauhan, Piyush Thakor, Satyanarayana Samavedam, Ramakrishnan Mannarsamy, Ashif Sheikh, Ashraf Javed

Welspun Corp Ltd, Gujarat, India

Paper No. IOGPC2015-7967, pp. V001T02A004; 13 pages
doi:10.1115/IOGPC2015-7967
From:
  • ASME 2015 India International Oil and Gas Pipeline Conference
  • ASME 2015 India International Oil and Gas Pipeline Conference
  • New Delhi, India, April 17–18, 2015
  • Conference Sponsors: Pipeline Systems Division
  • ISBN: 978-0-7918-5646-8
  • Copyright © 2015 by ASME

abstract

The mechanical properties of welding material is correlative with the diffusible hydrogen content in weld metal and level of moisture content in flux. Minitab16program to predict mechanical properties correlated to diffusible hydrogen content in weld metal and level of moisture content in flux, such as yield strength, tensile strength, elongation and average Charpy impact toughness of welding material is established by using submerged arc welding process in line pipe manufacturing. The present paper aims to experiment and investigate the line pipe SAW Flux used for offshore/onshore applications. Flux moisture content has been studied under Karl Fischer Coulometer method. Subsequently, flux was then used to make weld to analysis for ‘diffusible hydrogen content in weld metal’ through mercury displacement method. This detailed study envisages and explains the correlations between the mechanical properties and micro structures of weldments. Evaluating the variance of moisture level in flux and diffusible hydrogen content in weld metal proves the advantage of restricting the moisture content along with good practices to accomplish better weld quality.

Copyright © 2015 by ASME

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