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Welding in the World

, Volume 63, Issue 1, pp 201–210 | Cite as

Characterization of spontaneous magnetic signals for residual stress in plasma transferred arc welding process

  • Zhengchun Qian
  • Haihong HuangEmail author
  • Lunwu Zhao
  • Qingdi Ke
  • Gang Han
Research Paper
  • 82 Downloads

Abstract

The residual stress produced in plasma transferred arc welding (PTAW) has strong effects on the service performance of remanufacturing components. In this study, a novel non-destructive testing method based on spontaneous magnetic signals is used to characterize the residual stress in PTAW. Experimental results show that both magnetic signal tangential components Hp(x) and normal components Hp(y) can locate the high residual stress zones from the welded specimen. A new characteristic value Hp is proposed to reflect the residual stress distribution, and its average value Hpa is further calculated to quantify the residual stress level. The characteristic value Hpa increases exponentially with an increase in average residual stress σa paralleled to the cladding coating, whereas it decreases linearly perpendicular to the cladding coating. Except for the temperature gradients, the various phases with different material mechanical properties may lead to different volume shrinkage during cooling process, which is the possible reason underlying the high residual stress and large magnetic field at heat affected zone (HAZ).

Keywords

Plasma transferred arc welding Residual stress Spontaneous magnetic signals Magnetic memory method 

Notes

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 51675155, 51635010 and 51722502).

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Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  • Zhengchun Qian
    • 1
  • Haihong Huang
    • 1
    Email author
  • Lunwu Zhao
    • 1
  • Qingdi Ke
    • 1
  • Gang Han
    • 1
  1. 1.School of Mechanical EngineeringHefei University of TechnologyHefeiChina

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