Study of the Influence of Longitudinal Static Magnetic Field on Surface Quality and Performances of Arc Welding Based Additive Forming Parts

doi:10.3901/JME.2018.02.084

Abstract

Abstract: External magnetic field is one of the effective ways to influence arc welding based additive forming(AWAF) process and performances of forming parts. To study the influence of external longitudinal static magnetic on surface quality and mechanical performances of mild steel parts fabricated by AWAF process, an external longitudinal static magnetic assisted AWAF setup is developed, and morphology analysis, metallographic observation and performance testing are employed to compare and analyze the differences of surface quality, microstructure and mechanical performances of specimens fabricated by AWAF process with or without applying external longitudinal static magnetic. The results show that the external magnetic field can enlarge the aspect ratio of single weld bead and result in a wide and flat bead cross-sectional topography, which can effectively improve overlapping accuracy and surface quality of depositied layers. The electromagnetic stirring can refine grains, reduce defects and the inhomogeneity of the grain distribution in multi-beads overlapping region. Furthermore, the external magnetic field can change the proportion and distributed pattern of ferrite and pearlite. Mechanical performance tests show that the external magnetic field is capable of improving the mechanical performances in both deposition and overlapping direction, and reducing the anisotropy.

Key words: arc welding based additive forming, external longitudinal static magnetic field, mechanical performances, microstructure

CLC Number:

TG47

ZHOU Xiangman, TIAN Qihua, DU Yixian, ZHANG Haiou, WANG Guilan, MEI Feixiang. Study of the Influence of Longitudinal Static Magnetic Field on Surface Quality and Performances of Arc Welding Based Additive Forming Parts[J]. Journal of Mechanical Engineering, 2018, 54(2): 84-92.

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