|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Large-scale Metallic Components
||Large Metal Structures with Wire Arc Additive Manufacturing- Case Studies with Invar Tooling and AM718 Structural Parts
||Badri Narayanan, Ben Schaeffer, Brad Barnhart, Andrzej Nycz, Sougata Roy, Hannah Sims, Thodla Ramgopal
|On-Site Speaker (Planned)
Building large metal structures requires fundamental understanding of traditional welding metallurgy principles in conjunction with optimizing deposition paths using end effectors. This work showcases the capabilities of fabricating large structures deposited with a robotic wire arc additive system that leverages advances in programmatic path planning, feedstock design, and metal delivery process optimization.
The ability to programmatically control metal delivery in a controlled fashion to minimize macro defects and achieve near net shaping will be illustrated with Invar aerospace layup tooling. The effect of printing and post weld heat treatment parameters was studied to characterize the magnitude and anisotropy of its coefficient of thermal expansion (CTE).
The effect of process variables and post deposition heat treatments on the mechanical performance and resistance to environmental assisted cracking (EAC) on AM 718 will also be presented. The EAC results on additively built parts will be compared to wrought 718 subjected to similar conditions.
||Additive Manufacturing, Characterization, Environmental Effects