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Transactions of the Indian Institute of Metals

, Volume 71, Issue 12, pp 2933–2944 | Cite as

Microstructure, Properties and Corrosion Characterization of Welded Joint for Composite Pipe Using a Novel Welding Process

  • Bensheng Huang
  • Quan Chen
  • Xing Zhao
  • Rongfu Zhang
  • Yao Zhu
Technical Paper
  • 53 Downloads

Abstract

In this paper, a novel process welding for composite pipe, firstly overlaid by SMAW in composite pipe end and subsequently butted by TIG, can greatly improve the joints' comprehensive properties. Mechanical, corrosion tests and microstructure observation were carried out on welded joints. The results show that base X65 is composed of pearlite and ferrite and the weld is composed of dendritic austenite. The microstructure of HAZ in X65 has an upper bainite with coarse grains. The overlaying layer contains single-phase dendritic austenite, which has an apparent phenomenon of competitive growth similar to the weld, with solid subgrain boundary, solidified grain boundary and migrated grain boundary. By comparing the conventional welding process with the novel welding process, the welded joint shows better properties in mechanics and corrosion, showing the advantages in composite pipe.

Keywords

Bimetal composite pipe Tube end overlaying Ni-based alloy Novel welding process Microstructure and properties 

Notes

Acknowledgements

This study was financially supported by the Key Laboratory of Ministry of Education of Oil & Gas Equipment (Fund Number OGE201402-02) and Key Laboratory of Material of Oil & Gas of Sichuan Provincial Education Department (Project Number X151516KCL01).

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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  • Bensheng Huang
    • 1
  • Quan Chen
    • 1
  • Xing Zhao
    • 1
  • Rongfu Zhang
    • 1
  • Yao Zhu
    • 1
  1. 1.School of Materials Science and EngineeringSouthwest Petroleum UniversityChengduChina

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