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Toughness Scatter About FCAW-S Girth Weld for X80 Pipeline Steel

  • Youxiao Xu
  • Feng Wang
  • Lin Chen
  • Ziyun Wei
  • Weichen Song
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

The toughness scatter about Flux-Cored Arc Welding Self for X80 pipeline steel was investigated to explore the reason that causes toughness scatter, and how to improve the toughness scatter. The type of the metallography, the volume fraction and the pattern distribution of M/A constituents, and the effects of them to the weld toughness were studied by weld thermal-cycle curves measurement, thermal simulation experiments, Charpy Impact Test, optical microscope observation and SEM. The results showed that the toughness scatter was observed in temperature region of Ac1–Ac3, MA constituent directly related to the charpy impact toughness, toughness decreased with increasing of the volume fraction of MA constituent. It is considered that bacilliform MA is the main reason that cause toughness scatter, bulk MA is another reason that cause low toughness.

Keywords

X80 pipeline Flux-Cored arc welding self Girth weld Toughness scatter MA constituent 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Youxiao Xu
    • 1
  • Feng Wang
    • 2
  • Lin Chen
    • 1
  • Ziyun Wei
    • 1
  • Weichen Song
    • 1
  1. 1.Sinopec Petroleum Engineering Co., Ltd.YingkouChina
  2. 2.China Petroleum Pipeline Research Institute Co., Ltd.LangfangChina

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