Space Launch System (SLS)

NASA Welds First Flight Section of SLS Core Stage for 2018 Maiden Launch

Space Launch System (SLS) core stage engine section finishes welding at the Vertical Assembly Center at NASA’s Michoud Assembly Facility in New Orleans for maiden flight of SLS rocket. Credit: NASA

One weld at a time, the flight hardware for NASA’s mammoth new Space Launch System (SLS) booster has at last started taking shape, promising to turn years of planning and engineering discussions into reality and a rocket that will one day propel our astronauts on a ‘Journey to Mars.’

The first actual SLS flight hardware has been assembled, leaping from engineering blueprints on computer screens to individual metallic components that technicians are feeding into NASA’s gigantic “Welding Wonder” machine at the agency’s Michoud Assembly Facility in New Orleans.

Technicians are bending metal and have now finished welding together the pieces of flight hardware forming the first major SLS flight component – namely the engine section that sits at the base of the SLS core stage.

The engine section of the core stage will house the four RS-25 engines that will power the maiden launch of SLS and NASA’s Orion deep space manned spacecraft in late 2018.

The core stage towers over 212 feet (64.6 meters) tall, sports a diameter of 27.6 feet (8.4 m) and stores the cryogenic liquid hydrogen and liquid oxygen that feeds and fuels the boosters RS-25 engines.

A liquid oxygen tank confidence article for NASA’s new rocket, the Space Launch System, completes final welding on the Vertical Assembly Center at Michoud Assembly Facility in New Orleans. Credit: NASA/Michoud/Steven Seipel

SLS will be the most powerful rocket the world has ever seen. It will propel astronauts in the Orion capsule on deep space missions, first back to the Moon by around 2021, then to an asteroid around 2025 and then beyond to the Red Planet in the 2030s – NASA’s overriding and agency wide goal.

NASA’s Space Launch System (SLS) blasts off from launch pad 39B at the Kennedy Space Center in this artist rendering showing a view of the liftoff of the Block 1 70-metric-ton (77-ton) crew vehicle configuration. Credit: NASA/MSFC

The SLS core stage welding work is carried out in the massive 170-foot-tall Vertical Assembly Center (VAC) at Michoud. Boeing is the prime contractor for the SLS core stage.

On Sept. 12, 2014, NASA Administrator Charles Bolden officially unveiled VAC as the world’s largest welder at Michoud.

“This rocket is a game changer in terms of deep space exploration and will launch NASA astronauts to investigate asteroids and explore the surface of Mars while opening new possibilities for science missions, as well,” said NASA Administrator Charles Bolden during the ribbon-cutting ceremony at Michoud.

NASA Administrator Charles Bolden officially unveils world’s largest welder to start construction of core stage of NASA’s Space Launch System (SLS) rocket at NASA Michoud Assembly Facility, New Orleans, on Sept. 12, 2014. SLS will be the world’s most powerful rocket ever built. Credit: Ken Kremer –

Each of the RS-25’s engines generates some 500,000 pounds of thrust, fueled by cryogenic liquid hydrogen and liquid oxygen. They are recycled for their original use as space shuttle main engines

For SLS they will be operating at 109% of power, compared to a routine usage of 104.5% during the shuttle era. They measure 14 feet tall and 8 feet in diameter.

The SLS weld team has been busy. Technicians have already assembled a qualification version of the engine section on the Vertical Assembly Center at Michoud. Later this year it will be shipped to NASA’s Marshall Space Flight Center in Huntsville, Alabama, to undergo structural loads testing.

In March, they also completed welding of a liquid oxygen tank confidence article on the Vertical Assembly Center. And in February they welded the liquid hydrogen tank confidence article.

SLS core stage will be welded together from barrels and domes using the Vertical Assembly Center (VAC) at NASA’s Michoud Assembly Facility. Credit: Ken Kremer/

The SLS core stage is comprised of five major structures: the forward skirt, the liquid oxygen tank, the intertank, the liquid hydrogen tank and the engine section.

The tanks are assembled by joining previously manufactured domes, rings and barrels components together in the Vertical Assembly Center by a process known as friction stir welding. The rings connect and provide stiffness between the domes and barrels.

The SLS core stage builds on heritage from NASA’s Space Shuttle Program and is based on the shuttle’s External Tank (ET). All 135 ET flight units were built at Michoud during the thirty year long shuttle program.

According to the current schedule, NASA plans to finish all welding for the core stage — including confidence, qualification and flight hardware — of the SLS-1 rocket sometime this summer.

Engineers are constructing the confidence and qualification hardware units to verify that the welding equipment and procedures work exactly as planned.

“The confidence will also be used in developing the application process for the thermal protection system, which is the insulation foam that gives the tank its orange color,” say NASA officials.

Altogether , the SLS first stage propulsion comprises the four RS-25 space shuttle main engines and a pair of enhanced five segment solid rocket boosters (SRBs) also derived from the shuttles four segment boosters.

The maiden test flight of the SLS/Orion is targeted for no later than November 2018 and will be configured in its initial 70-metric-ton (77-ton) version with a liftoff thrust of 8.4 million pounds.

Meanwhile the welded skeletal backbone for the Orion EM-1 mission recently arrived at the Kennedy Space Center on Feb. 1 for outfitting with all the systems and subsystems necessary for flight.

Orion crew module pressure vessel for NASA’s Exploration Mission-1 (EM-1) is unveiled for the first time on Feb. 3, 2016 after arrival at the agency’s Kennedy Space Center (KSC) in Florida. It is secured for processing in a test stand called the birdcage in the high bay inside the Neil Armstrong Operations and Checkout (O&C) Building at KSC. Launch to the Moon is slated in 2018 atop the SLS rocket. Credit: Ken Kremer/

Stay tuned here for Ken’s continuing Earth and Planetary science and human spaceflight news.

Ken Kremer

Ken Kremer

Dr. Ken Kremer is a speaker, research scientist, freelance science journalist (KSC area,FL) and photographer whose articles, space exploration images and Mars mosaics have appeared in magazines, books, websites and calendars including Astronomy Picture of the Day, NBC, FOX, BBC,, Spaceflight Now, Science and the covers of Aviation Week & Space Technology, Spaceflight and the Explorers Club magazines. Ken has presented at numerous educational institutions, civic & religious organizations, museums and astronomy clubs. Ken has reported first hand from the Kennedy Space Center, Cape Canaveral, NASA Wallops, NASA Michoud/Stennis/Langley and on over 80 launches including 8 shuttle launches. He lectures on both Human and Robotic spaceflight - Follow Ken on Facebook and Twitter

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