What is cryogenic hydrogen storage, and how is Friction Stir Welding used in its development?

Cryogenic hydrogen storage involves storing hydrogen at extremely low temperatures—typically below -253°C—in liquid form. This method allows for higher energy density and is critical for applications like aerospace propulsion, long-range transportation, and space exploration, where weight and volume are key constraints.

Friction stir welding (FSW) is a key technology for creating cryogenic hydrogen storage tanks, particularly those made of aluminum alloys, offering advantages like high-strength joints and reduced defects compared to traditional welding methods. Because FSW produces high-integrity welds with low porosity and minimal thermal distortion, it helps ensure the structural integrity and leak-tightness required for safely containing liquid hydrogen. Its ability to join lightweight materials like aluminum and aluminum-lithium alloys makes it especially suitable for these demanding cryogenic applications.