Numerical Simulation of Keyhole TIG Welding of Dissimilar Steels Based on Asymmetric Heat Source

doi:10.3901/JME.2018.02.041

Abstract

Abstract: A research of the welding process of the 8mm thickness 316L stainless steel and Q345 low alloy steel is conducted using key-hole tungsten inert-gas welding. ANSYS finite element software is used to simulate the welding process and evaluate the stability of the welding process. The results show that under certain welding parameters, a well formed weld with sided welding double-sided forming can achieved by keyhole TIG welding of dissimilar steel. At the same time, an asymmetric heat source model is proposed based on the results of dissimilar steel welding. The upper part of the double ellipsoid heat source is combined with the lower part of the cylindrical heat source, and the heat source is adjusted independently. The application of asymmetric heat source results in a high degree of coincidence with the experimental weld, with an average error of no more than 8%. The simulation results show that, temperature in the 316L stainless steel side is lower, and the narrow root weld bead width and high surface tension in 316L stainless steel side make up for the defect of Q345 side, causing the keyhole balanced and maintaining the stability of the welding process.

Key words: asymmetric heat source, dissimilar steels, keyhole TIG welding, numerical simulation

CLC Number:

TG457

HUANG Yifei, LUO Zhen, AO Sansan, FAN Wenfei. Numerical Simulation of Keyhole TIG Welding of Dissimilar Steels Based on Asymmetric Heat Source[J]. Journal of Mechanical Engineering, 2018, 54(2): 41-47.

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