Welding in the World

, Volume 61, Issue 6, pp 1155–1168 | Cite as

Effect of interpass temperature on the microstructure and mechanical properties of multi-pass weld metal in a 550-MPa-grade offshore engineering steel

  • X. L. Wang
  • Y. T. Tsai
  • J. R. YangEmail author
  • Z. Q. Wang
  • X. C. Li
  • C. J. ShangEmail author
  • R. D. K. Misra
Research Paper


The influence of interpass temperature on the microstructure and mechanical properties of multi-pass weld joints (up to 36-mm thickness) by submerged arc welding (SAW) was studied from the perspective of offshore engineering. Optimal mechanical properties were obtained with the interpass temperature of ~130 °C. Decreasing interpass temperature from 130 to 80 °C increases the strength and hardness at the cost of impact toughness of the weld joint due to the formation of hard phases including bainite and martensite. Increasing the interpass temperature from 130 to 250 °C promotes a larger volume fraction of coarse M-A constituents and larger inter-spacing of high-angle boundaries, which, in turn, deteriorates the toughness. In addition, a large amount of M-A constituent necklacing prior austenite grains was observed in the reheated zone of all weld metals and was responsible for the low impact energy of the weld joint.

Keywords (IIW Thesaurus)

Offshore engineering steel Interpass temperature Weld metal M-A constituent Toughness Effective grain size 



This work is financially supported by the Natural Science Foundation of China (51371001). Thanks to Mr. Min Li from Technology Center, Jinan Iron & Steel Co., Ltd., for the operation of welding experiment. R.D.K. Misra gratefully acknowledges the support of the University of Texas at El Paso.


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Copyright information

© International Institute of Welding 2017

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Department of Materials Science and EngineeringNational Taiwan UniversityTaipeiTaiwan
  3. 3.Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijingChina
  4. 4.Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical EngineeringUniversity of TexasEl PasoUSA

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