Mechanical properties and microstructure of flash-butt CT-90 steel weldet joint

Yongxin Lu; Xiao Li; Yanming Liu; Hongduo Wang; Dachuan He

doi:10.3139/120.111482

Published by De Gruyter February 25, 2020

Mechanical properties and microstructure of flash-butt CT-90 steel weldet joint

Yongxin Lu , Xiao Li , Yanming Liu , Hongduo Wang and Dachuan He

From the journal Materials Testing

https://doi.org/10.3139/120.111482

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Abstract

The present work reports new results about developments in the flash butt welding of CT-90 (Coiled Tubing-90) steel. In this study, the flash-butt welding process, microstructures and mechanical properties of the weldet joint are investigated. The main findings are as follows: upset current has a significant effect on microstructures and the mechanical properties of a welded joint. When the upset current value is 357.9 A, polygonal ferrite and pearlite occur in the weld metal, and the mechanical properties of joint are at their best with a yield strength (YS) in the joint of 635 MPa, ultimate tensile strength (UTS) of the joint at 706 MPa, impact-absorbed energy of the weld at 112 J × cm⁻², and with the impact-absorbed energy of the heat affected zone at 166 J × cm⁻².

∗ Correspondence Address, Dr. Yongxin Lu, School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, P. R. China, E-mail: luyongxin@xsyu.edu.cn, xli@xsyu.edu.cn

Yongxin Lu, born 1986, graduated with a Doctoral degree from the School of Material Science and Engineering, Tianjin University, China, in 2017, following which he becamea lecturer at the School of Material Science and Engineering, Xi'an Shiyou University, China. His main research areas are corrosion and the protection of the metal material welding joint, and the environmental corrosion evaluation of welding joints.

Prof. Xiao Li, born in 1969, graduated with an MSc from the School of Material Science and Engineering, Xi'an Shiyou University in 1999. Currently, she is an Associate Professor in the same faculty. Her main research areas are welding residual stress, deformation control and the finite element analysis of welded joints.

Yanming Liu, born 1978, graduated with a Master's degree from the School of Material Science and Engineering, Xi'an Shiyou University, China, in 2005. Currently, he is a Senior Engineer in the same faculty. His main research areas are welding procedure for petroleum pipeline steel, the surface modification of steel, and the environmental corrosion evaluation of welding joints.

Hongduo Wang, born 1976, graduated with a Master's degree from the School of Material Science and Engineering, Xi'an Shiyou University, China, in 2009. He continues working at the School of Material Science and Engineering, Xi'an Shiyou University, China. His main research areas are the microstructure and mechanical properties of the metal material welding joint.

Dachuan He, born 1995, graduated with a Undergraduate degree from the School of Material Science and Engineering, Xi'an Shiyou University, China, in 2017. After that, he continued to study at the School of Material Science and Engineering, Xi'an Shiyou University, China. His main research areas are welding process.

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Published Online: 2020-02-25

Published in Print: 2020-03-02

Mechanical properties and microstructure of flash-butt CT-90 steel weldet joint

Abstract

References

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