Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF

Houyi Li; Xiansheng Hu; Zhixiang Peng; Youlong Zhou

doi:doi:10.11648/j.ijmea.20190704.12

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Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF

Houyi Li, Xiansheng Hu, Zhixiang Peng, Youlong Zhou

Published in International Journal of Mechanical Engineering and Applications (Volume 7, Issue 4)

Received: 14 July 2019 Accepted: 15 August 2019 Published: 3 September 2019

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Abstract

SX780CF is a new type domestic high strength low alloy (HSLA) steel with tensile strength of 800 MPa, which was used firstly for pressure pipes in the hydropower unit. In order to improve the efficiency, SX780CF is generally welded by submerged arc welding (SAW), and a kind of special intelligent welding machine for large-scale pressure steel pipe was adopted, which can realize intelligent mechanized grouping and automatic welding in tunnel. In this paper, two different levels of heat input were used to weld SX780CF. The weldability of two joints was analyzed, the mechanical properties of the joints were measured, and the hardness distribution of the joints was tested. Meanwhile, the microstructure was observed. The results show that the properties of these joints welded by two different levels of heat input could satisfy the demand of the GB 50766 -2012 standard. The mechanical properties of the weld joint with larger heat input were slightly higher than those with smaller heat input. The hardened tendency of SX780CF is small, however, the steel with the thickness of 60 mm needs to be preheated at more than 112°C. Comprehensive comparison shows that the submerged arc welding method with larger heat input has better efficiency and cost advantage, and it is worthy of promotion in hydropower project.

Published in	International Journal of Mechanical Engineering and Applications (Volume 7, Issue 4)
DOI	10.11648/j.ijmea.20190704.12
Page(s)	101-105
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

SX780CF, High Strength Low Alloy (HSLA) Steel, SAW, Heat Input, Welding Procedure

References

[1]	Z. L. Tang, S. P. Xu, S. Peng, Z. B. Li, Z. J. Zhang, J. Y. Huang, “Research and Development of Q690CFE Steel Plate for Pressure Steel Pipe and Spiral Case of Hydropower Station,” Steel Rolling, vol. 35, pp. 79-80, 2018.
[2]	Y. Zhai, Z. T. Li, X. Zhang, H. Liu, “Development of 800MPa Hydropower Steel Pipe for Large Heat Input,” Welding Technology, vol. 45, pp. 66-69, 2016.
[3]	L. M. Duan, Y. Xu, “Application of New Technology on Super Large Penstock Manufacture in Liyuan Hydropower Station,” Water Power, vol. 41, pp. 88-90, 2015.
[4]	I. Michio, “Welding Processing,” Seibundo-Shinkosha Co., Ltd., Tokyo, 1971.
[5]	Z. F. Zhou, “Welding Metallurgy,” Southwest Jiaotong University Press, Chengdu, 2012.
[6]	R. H. Espy, “Weldability of Nitrogen-Strengthened Stainless Steels,” Welding Journal, vol. 61, pp. 149–156, 1982.
[7]	The standard of People’s Republic of China. GB/T 50766-2012 Code for manufacture installation and acceptance of steel penstocks in hydroelectric and hydraulic engineering, 2007.
[8]	Z. C. Liu, Z. Sun, W. Guo, X. J. Li, Y. Wu, “Development of Steel Plates for Large Scale 780MPa Hydropower Stations with Excellent Low Temperature Toughness and Weldability,” 8th National academic conference on pressure pipeline of hydropower station, Chengdu, China, 2014.
[9]	C. H. Xu, “Controlling on Microstructure and Performances of Welding Joints of 800MPa Ultra-Fine Grained Steel,” Master's Thesis, Harbin Institute of Technology, Harbin, 2009.
[10]	Y. J. Li, “Welding of High Strength Steel,” Metallurgical Industry Press Co., Ltd., Beijing, 2010.

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APA Style

Houyi Li, Xiansheng Hu, Zhixiang Peng, Youlong Zhou. (2019). Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF. International Journal of Mechanical Engineering and Applications, 7(4), 101-105. https://doi.org/10.11648/j.ijmea.20190704.12

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ACS Style

Houyi Li; Xiansheng Hu; Zhixiang Peng; Youlong Zhou. Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF. Int. J. Mech. Eng. Appl. 2019, 7(4), 101-105. doi: 10.11648/j.ijmea.20190704.12

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AMA Style

Houyi Li, Xiansheng Hu, Zhixiang Peng, Youlong Zhou. Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF. Int J Mech Eng Appl. 2019;7(4):101-105. doi: 10.11648/j.ijmea.20190704.12

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@article{10.11648/j.ijmea.20190704.12,
  author = {Houyi Li and Xiansheng Hu and Zhixiang Peng and Youlong Zhou},
  title = {Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {7},
  number = {4},
  pages = {101-105},
  doi = {10.11648/j.ijmea.20190704.12},
  url = {https://doi.org/10.11648/j.ijmea.20190704.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20190704.12},
  abstract = {SX780CF is a new type domestic high strength low alloy (HSLA) steel with tensile strength of 800 MPa, which was used firstly for pressure pipes in the hydropower unit. In order to improve the efficiency, SX780CF is generally welded by submerged arc welding (SAW), and a kind of special intelligent welding machine for large-scale pressure steel pipe was adopted, which can realize intelligent mechanized grouping and automatic welding in tunnel. In this paper, two different levels of heat input were used to weld SX780CF. The weldability of two joints was analyzed, the mechanical properties of the joints were measured, and the hardness distribution of the joints was tested. Meanwhile, the microstructure was observed. The results show that the properties of these joints welded by two different levels of heat input could satisfy the demand of the GB 50766 -2012 standard. The mechanical properties of the weld joint with larger heat input were slightly higher than those with smaller heat input. The hardened tendency of SX780CF is small, however, the steel with the thickness of 60 mm needs to be preheated at more than 112°C. Comprehensive comparison shows that the submerged arc welding method with larger heat input has better efficiency and cost advantage, and it is worthy of promotion in hydropower project.},
 year = {2019}
}

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TY  - JOUR
T1  - Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF
AU  - Houyi Li
AU  - Xiansheng Hu
AU  - Zhixiang Peng
AU  - Youlong Zhou
Y1  - 2019/09/03
PY  - 2019
N1  - https://doi.org/10.11648/j.ijmea.20190704.12
DO  - 10.11648/j.ijmea.20190704.12
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 101
EP  - 105
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20190704.12
AB  - SX780CF is a new type domestic high strength low alloy (HSLA) steel with tensile strength of 800 MPa, which was used firstly for pressure pipes in the hydropower unit. In order to improve the efficiency, SX780CF is generally welded by submerged arc welding (SAW), and a kind of special intelligent welding machine for large-scale pressure steel pipe was adopted, which can realize intelligent mechanized grouping and automatic welding in tunnel. In this paper, two different levels of heat input were used to weld SX780CF. The weldability of two joints was analyzed, the mechanical properties of the joints were measured, and the hardness distribution of the joints was tested. Meanwhile, the microstructure was observed. The results show that the properties of these joints welded by two different levels of heat input could satisfy the demand of the GB 50766 -2012 standard. The mechanical properties of the weld joint with larger heat input were slightly higher than those with smaller heat input. The hardened tendency of SX780CF is small, however, the steel with the thickness of 60 mm needs to be preheated at more than 112°C. Comprehensive comparison shows that the submerged arc welding method with larger heat input has better efficiency and cost advantage, and it is worthy of promotion in hydropower project.
VL  - 7
IS  - 4
ER  -

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Author Information

Houyi Li

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China
Xiansheng Hu

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China
Zhixiang Peng

Chengdu Alang Science and Technology Co., Ltd., Chengdu, China
Youlong Zhou

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China

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Plain Text BibTeX RIS

APA Style

Houyi Li, Xiansheng Hu, Zhixiang Peng, Youlong Zhou. (2019). Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF. International Journal of Mechanical Engineering and Applications, 7(4), 101-105. https://doi.org/10.11648/j.ijmea.20190704.12

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ACS Style

Houyi Li; Xiansheng Hu; Zhixiang Peng; Youlong Zhou. Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF. Int. J. Mech. Eng. Appl. 2019, 7(4), 101-105. doi: 10.11648/j.ijmea.20190704.12

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AMA Style

Houyi Li, Xiansheng Hu, Zhixiang Peng, Youlong Zhou. Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF. Int J Mech Eng Appl. 2019;7(4):101-105. doi: 10.11648/j.ijmea.20190704.12

Copy | Download

@article{10.11648/j.ijmea.20190704.12,
  author = {Houyi Li and Xiansheng Hu and Zhixiang Peng and Youlong Zhou},
  title = {Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {7},
  number = {4},
  pages = {101-105},
  doi = {10.11648/j.ijmea.20190704.12},
  url = {https://doi.org/10.11648/j.ijmea.20190704.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20190704.12},
  abstract = {SX780CF is a new type domestic high strength low alloy (HSLA) steel with tensile strength of 800 MPa, which was used firstly for pressure pipes in the hydropower unit. In order to improve the efficiency, SX780CF is generally welded by submerged arc welding (SAW), and a kind of special intelligent welding machine for large-scale pressure steel pipe was adopted, which can realize intelligent mechanized grouping and automatic welding in tunnel. In this paper, two different levels of heat input were used to weld SX780CF. The weldability of two joints was analyzed, the mechanical properties of the joints were measured, and the hardness distribution of the joints was tested. Meanwhile, the microstructure was observed. The results show that the properties of these joints welded by two different levels of heat input could satisfy the demand of the GB 50766 -2012 standard. The mechanical properties of the weld joint with larger heat input were slightly higher than those with smaller heat input. The hardened tendency of SX780CF is small, however, the steel with the thickness of 60 mm needs to be preheated at more than 112°C. Comprehensive comparison shows that the submerged arc welding method with larger heat input has better efficiency and cost advantage, and it is worthy of promotion in hydropower project.},
 year = {2019}
}

Copy | Download

TY  - JOUR
T1  - Influence of Different Heat Input on Submerged Arc Welded Joints of High Strength Low Alloy Steel SX780CF
AU  - Houyi Li
AU  - Xiansheng Hu
AU  - Zhixiang Peng
AU  - Youlong Zhou
Y1  - 2019/09/03
PY  - 2019
N1  - https://doi.org/10.11648/j.ijmea.20190704.12
DO  - 10.11648/j.ijmea.20190704.12
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 101
EP  - 105
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20190704.12
AB  - SX780CF is a new type domestic high strength low alloy (HSLA) steel with tensile strength of 800 MPa, which was used firstly for pressure pipes in the hydropower unit. In order to improve the efficiency, SX780CF is generally welded by submerged arc welding (SAW), and a kind of special intelligent welding machine for large-scale pressure steel pipe was adopted, which can realize intelligent mechanized grouping and automatic welding in tunnel. In this paper, two different levels of heat input were used to weld SX780CF. The weldability of two joints was analyzed, the mechanical properties of the joints were measured, and the hardness distribution of the joints was tested. Meanwhile, the microstructure was observed. The results show that the properties of these joints welded by two different levels of heat input could satisfy the demand of the GB 50766 -2012 standard. The mechanical properties of the weld joint with larger heat input were slightly higher than those with smaller heat input. The hardened tendency of SX780CF is small, however, the steel with the thickness of 60 mm needs to be preheated at more than 112°C. Comprehensive comparison shows that the submerged arc welding method with larger heat input has better efficiency and cost advantage, and it is worthy of promotion in hydropower project.
VL  - 7
IS  - 4
ER  -

Copy | Download