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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
ESI24 Haghighi Quadchart
Azadeh Haghighi
University of Illinois, Chicago
In-space manufacturing and assembly are vital to NASA’s long-term exploration goals, especially for the Moon and Mars missions. Deploying welding technology in space enables the assembly and repair of structures, reducing logistical burdens and supply needs from Earth. The unique challenges and extreme conditions of space–high thermal variations, microgravity, and vacuum–require advanced welding techniques and computational tools to ensure reliability, repeatability, safety, and structural integrity in one-shot weld scenarios. For the first time, this project investigates these challenges by focusing on three key factors: (1) Very low temperatures in space degrade the weldability of high thermal conductivity materials, like aluminum alloys, making it harder to achieve strong, defect-free welds. (2) The extreme vacuum in space lowers the boiling points of alloying elements, altering the keyhole geometry during welding. This selective vaporization changes the weld’s final chemical composition, affecting its microstructure and properties. (3) Microgravity nearly eliminates buoyancy-driven flow of liquid metal inside the molten pool, preventing gas bubbles from escaping, which leads to porosity and defects in the welds. By examining these critical factors using multi-scale multi-physics models integrated with physics-informed machine learning, and forward/inverse uncertainty quantification techniques, this project provides the first-ever real-time digital twin platform to evaluate welding processes under extreme space/lunar conditions. The models are validated through Earth-based experiments, parabolic flight tests, and publicly available data from different databases and agencies worldwide. Moreover, the established models will facilitate extendibility to support in-situ resource utilization on the Moon, including construction and repair using locally sourced materials like regolith. The established fundamental scientific knowledge will minimize trial-and-error, enable high-quality one-shot welds in space, and reduce the need for reworks, significantly reducing the costs and time needed for space missions.
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By NASA
1 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
ESI24 Li Quadchart
Wei Li
University of Texas at Dallas
Internal defects are always formed in laser welding process due to the keyhole instability, molten pool collapse, and rapid solidification. The extreme lunar environment complicates the reliable implementation of welding, thereby enhancing the welding defects formation. The welding defects are critical material barriers preventing the metal components from Moon exploration. Professor Wei Li’s team will establish an integrated computational materials modelling framework to study the process-structure-property linkage of laser welding under the lunar conditions. The research is emphasized on modelling the internal defects (void, lack of fusion) formed in the lunar laser welding by fully considering the reduced gravity, large temperature change, and extreme vacuum on the Moon surface, and predicting the influence of internal defects on the material and mechanical properties of welding joint.
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By NASA
Credit: NASA NASA has awarded the Custodial and Refuse/Recycle Services contract to Ahtna Integrated Services LLC of Anchorage, Alaska, to provide trash, waste, and recycling services at the agency’s Ames Research Center in California’s Silicon Valley.
This is a hybrid contract that includes a firm-fixed-price and an indefinite-delivery/indefinite-quantity portion. The period of performance begins Friday, Nov. 1, with a 60-day phase-in period, followed by a one-year base period, and options to extend performance through November 2029. This contract has a maximum potential value of approximately $24 million.
Under this contract, the company will perform basic, regularly scheduled custodial and refuse and recycling services at NASA Ames. The company will focus on health and safety, environmental compliance, sanitary cleaning, and customer service.
For information about NASA and agency programs, visit:
https://nasa.gov
-end-
Hillary Smith
Ames Research Center, Moffett Field, Calif.
650-313-1701
Hillary.smith@nasa.gov
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