SUMMARY

Wire arc additive manufacturing (WAAM) is an emerging technology, and as such the ideal parameter sets for various metals, structures, and applications are still in development. This study examines the inter-layer dwell parameter, which determines how long a deposited layer is left to solidify before the next layer is deposited. The solidification time, interpass temperature reached, and reheating cycles due to subsequent layer depositions directly impact the geometry and material properties of the final structure. A literature review has shown that both the dwell parameters of a constant inter-layer dwell time and of a constant interpass temperature are frequently used in WAAM applications throughout various structures and materials. This study directly compares the two methods of dwell by implementing an in-situ forward looking infrared camera to monitor the inter-layer temperature during depositions. Two sets of experiments were conducted: one set which varied the constant interlayer dwell time between 10 seconds to two minutes, and one set which varied the interpass temperature from 500 °C to 150 °C. Rockwell B Hardness tests were then taken on all wall samples, and geometry was measured. This allowed for direct comparison between the two dwell methods and the relationship between interlayer dwell parameter and resultant hardness, geometry, and total deposition time to be considered.


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