The world’s largest spacecraft welding tool is now ready for use

Space · Published 9 October 2026 Swipe more like this →

In short: Building a rocket capable of reaching Mars requires more than just advanced physics; it requires industrial-scale precision. NASA recently unveiled the Vertical Assembly Center, a massive 170-foot-high marvel designed to fuse the structural components of the Space Launch System (SLS) with extreme accuracy.

The Vertical Assembly Center (VAC), located at NASA’s Michoud Assembly Facility in New Orleans, serves as a critical infrastructure piece for the Space Launch System (SLS). This machinery is specifically designed to assemble elements of the rocket that will eventually transport humans to an asteroid and Mars. Its primary role involves joining domes, rings, and barrel segments to complete the SLS fuel tanks.

The engineering requirements are immense because the core stage of the SLS must store cryogenic liquid hydrogen and liquid oxygen. Because it stands over 200 feet high and measures 27.6 feet across, a complete seal is required for this structure to manage unstable fuels. The VAC doesn't just join parts; it is also utilized to perform rigorous evaluations of the completed welds to ensure structural integrity under the extreme pressures of spaceflight.

Boeing serves as the main provider of avionics and the SLS core stage within a wider logistical network that includes this assembly task. Engineers in Mississippi at Stennis Space Center are currently getting ready to trial the RS-25 engines for the vehicle's core stage, even as New Orleans manages the construction. The project bridges historic engineering with modern goals, utilizing a B-2 Test Stand that once tested the Saturn V moon rocket and Space Shuttle main propulsion systems.

The completion of the VAC marks a transition from theoretical design to physical construction. By providing a dedicated space for heavy welding and structural integration, NASA can ensure that the massive fuel tanks meet the safety standards required for deep-space exploration.

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