Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 4: 533 - 540

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.386

Naval Architeture, Ocean and Civil Engineering

Behavior of High Strength Steel Butt Joints at Arctic Low Temperatures

  • CAO Huan ,
  • CAI Ao ,
  • CHEN Yangyu ,
  • ZUO Wenkang ,
  • CHEN Mantai
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  • 1. State Key Laboratory of Ocean Engineering
    2. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2023-08-11

  Revised date: 2023-10-07

  Accepted date: 2023-11-08

  Online published: 2023-11-14

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Abstract

To study the effect of Arctic low temperatures on the behavior of HG785 high strength steel butt joints, the microstructure observation, hardness distribution tests, and uniaxial tensile tests were performed on the butt joints fabricated by using two types of weld metals with exposure to five ambient and low temperatures. The results show that the butt joints possess a coherent metallographic structure and exhibit good fusion between weld metal and base metal. Only a softening heat affected zone is observed in the weld joint samples under two matching conditions. The butt joint tensile specimens exposed to Arctic low temperatures possess higher strengths compared to those at ambient temperatures. The ductility improvement due to low-temperature exposure for equal-matching welded butt joint is substantial, whilst that for over-matching welded butt joints is negligible. All butt joint tensile specimens fail in a ductile manner. The findings provide a scientific basis for the engineering applications of high strength steel structures in Arctic low-temperature regions.

Key words： high strength steel; butt joint; microstructure observation; hardness test; low temperature mechanical properties

Cite this article

CAO Huan , CAI Ao , CHEN Yangyu , ZUO Wenkang , CHEN Mantai . Behavior of High Strength Steel Butt Joints at Arctic Low Temperatures[J]. Journal of Shanghai Jiaotong University, 2025 , 59(4) : 533 -540 . DOI: 10.16183/j.cnki.jsjtu.2023.386

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