Simulation of Heat and Mass Transfer in Arc Welding based Additive Forming Process with External Transverse Magnetic Field

doi:10.3901/JME.2018.12.193

Abstract

Abstract: In order to reveal the inherent mechanism of the influence of transverse magnetic field on heat and mass transfer of the arc and molten pool in arc welding based additive forming(AWAF) process, and the microstructure of the AWAF parts, a three-dimensional weak coupling numerical model of arc and metal transport is developed to simulate the arc, molten pool dynamic in GMAW baesd AWAF process. The studies of with and without external transverse magnetic field treatment in AWAF process are applied to analyze the electromagnetic force distribution in molten pool, the differences of heat and mass transfer of arc and molten pool by numerical simulation. The analytical results show that the external transverse magnetic field can deflect the arc toward the rear of molten pool, induce forced convection in one direction, drive the molten metal and heat to the rear of molten pool, and wash against the dendrite frontier more directly in molten pool. Therefore, it can predict that external transverse magnetic field enables the capacity of decreasing the temperature gradient and solute concentration at the front of dendritic during the solidification of the molten pool, which is able to increase the concentration undercooling of this area, increase the growth rate of dendritic that near the center of the molten pool and refine grains. The comparative experiments show that the external transverse magnetic field treatment can reduce the area of equiaxed zone at the bottom of molten pool as well as increase the area of refined cellular dendrite zone. The experimental results verify the predictions of numerical simulation. The conclusions of the above study provide the basis and reference for the application of the external magnetic field in the control of microstructure of AWAF parts.

Key words: arc welding based additive forming, heat and mass transfer, transverse magnetic field

CLC Number:

TG402
TG113

ZHOU Xiangman, TIAN Qihua, DU Yixian, BAI Xingwang, ZHANG Haiou. Simulation of Heat and Mass Transfer in Arc Welding based Additive Forming Process with External Transverse Magnetic Field[J]. Journal of Mechanical Engineering, 2018, 54(12): 193-206.

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