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Numerical analysis of arc driving forces and temperature distribution in pulsed TIG welding

  • Guangxi ZhaoEmail author
  • Jun Du
  • Zhengying Wei
  • Ruwei Geng
  • Siyuan Xu
Technical Paper
  • 59 Downloads

Abstract

In order to study the influence of each driving force on the flow of molten pool and its influence degree, separate action models for the arc driving forces were established based on the finite difference method. It is found that the descending order of the driving force influence is surface tension, arc pressure, Lorentz force, drag force and buoyancy when the current is a constant value of 200 A. Based on the calculation of arc driving forces, a transient three-dimensional model of the pulsed TIG welding is established. The alternation of peak current and base current leads to periodic oscillation of molten pool surface and the formation of welding ripples. The results show that the distance between adjacent welding ripples is almost directly proportional to the scanning speed and the molten pool depth decreases with increasing speed and the decreasing speed gradually decreases. By studying the distribution of pressure field and temperature field, it is found that the pressure distribution of a semi-arc column is basically a half-Gaussian distribution and the heat accumulation has a significant effect on the maximum temperature of the substrate.

Keywords

Pulsed TIG welding Welding ripple Arc driving force Temperature field 

Notes

Acknowledgements

This project is supported by the State Key Development Program Research of China under Grant No. 2017YFB1103201.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringXi’an JiaoTong UniversityXi’anChina

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