Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 251, Issue -, Pages 138-145Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2017.08.010
Keywords
Welding; Additive manufacturing; GTAW; Hot-wire; Vibration; Droplet; Welding
Funding
- Georgia Southern Office of Research Services and Sponsored Programs (ORSSP)
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Bead-on-plate experiments were carried out, and the weld-bead size and shape were compared and discussed. The welding droplet parameters were measured by a high-speed camera. A computation fluid dynamics (CFD) model utilizing VOF (volume of fluid) method, incorporating the experimental droplet parameters has been developed to understand the weld pool dynamics and subsequent weld pool geometry. From the experimental results, a narrower and deeper penetration was observed with hot-wire while wider and shallow penetration was observed with cold wire gas tungsten arc welding (GTAW). The developed model has been applied to predict and analyze the mechanism for narrower and deeper penetration. A modified relationship has been established for droplet detachment in hot wire GTAW.
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