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An Arc Code To Predict The Thermal Crack Of Welded Sample, Je-Ee Ho
An Arc Code To Predict The Thermal Crack Of Welded Sample, Je-Ee Ho
Journal of Marine Science and Technology
In this study, a numerical code with enthalpy method in upwind scheme is proposed to estimate the distribution of thermal stress in the molten pool, which is primarily determined by the type of the input power and travel speed of heating source. To predict the cracker deficit inside the workpiece, a simulated program satisfying the diagonal domination and Scarborough criterion provides a stable iteration. Meanwhile, an experimental performance, operated by robot arm “DR-400” to provide a steady and continuous arc welding, was also conducted to verify the simulated result. By surveying the consistence of molten pool bounded by contrast shade …
Evaporation Effect In Nonlinear Penetration Of High Energy Beam Drilling, Je-Ee Ho, Chen-Lung Yen
Evaporation Effect In Nonlinear Penetration Of High Energy Beam Drilling, Je-Ee Ho, Chen-Lung Yen
Journal of Marine Science and Technology
Due to the inappropriate assumption with the neglect of evaporation effect in previous research, a linear penetration behavior with a significant deviation from the experimental result was usually proposed in the lower energy density region. To remedy the defect, the evaporation mass determined from the difference between the melting rate and flow expulsion by pressure difference is reconsider in this study. With a 2-D quasic-steady model based on the enthalpy theory, the uniform penetration velocity estimated from the Stefan boundary condition provides a special advantage in calculating efficiency. Meantime, the divergent iteration has been effectively avoided by setting up a …