Abstract
Undulated surface appearance and inconsistent layer cross-sectional dimensions are two common types of appearance defects, which are formed owing to insufficient heat input and nonlinear time-varying thermal boundary condition of molten pool. Appropriate interpass temperature control and heat input regulations are effective ways to realise and maintain the consistent thermal boundary condition during bottom-up additive manufacturing process. Equivalent heat dissipation factor is used to synthetically characterise the variation of heat dissipation in process of additive manufacturing. Combing with Rosenthal's analytical solution, a theoretical model is developed to optimise interpass temperature and heat input for each layer deposition, so as to realise stable additive manufacturing. Finally a specification for the wire and arc additive manufacture procedure was designed according to the developed model which was verified effectively by manufacturing a wall part. It could also be a process design reference for other kinds of metal additive manufacturing.
Original language | English |
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Pages (from-to) | 472-483 |
Number of pages | 12 |
Journal | Science and Technology of Welding and Joining |
Volume | 22 |
Issue number | 6 |
DOIs | |
State | Published - 18 Aug 2017 |
Keywords
- equivalent heat dissipation
- heat input
- interpass temperature
- layer appearance
- layer size
- shape deposition control
- thermal boundary condition
- Wire and arc additive manufacturing