Thermodynamic Analysis of Single-layer Multi-pass Wire Arc Additive Manufacturing under Different Paths
In the process of additive manufacturing,the evolution of temperature and stress in metal has an important impact on the quality of formed parts.The surfacing experiment and finite element analysis of single-layer multi-pass arc additive manufactured parts were carried out.The thermal evolution law of single-layer multi-pass formed parts and the law of temperature field and stress field under the unidirectional scanning path along the long edge,the zigzag scanning path along the long edge and the unidirectional scanning path along the short edge were studied.The results show that the longitudinal stress release ability of the cladding surface is excellent,while the transverse stress is relatively stable and higher than the longitudinal stress in a certain area.The unidirectional scanning along the long edge has the best heat dissipation effect,followed by zigzag scanning path along the long edge,and the unidirectional scanning along the short edge is the lowest.Zigzag scanning can effectively avoid the stress concentration at the arc end of unidirectional scanning.The longitudinal stress along the short edge is less than that along the long edge,and the transverse stress is opposite.During single-layer multi-pass surfacing,the release degree of longitudinal stress and transverse stress should be weighed.
wire arc additive manufacturingscanning pathtemperature fieldstress field
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