火箭技术的飞跃发展,迫切要求强度高、焊接性能好、应力腐蚀敏感性低、在液氢和液氧温度下工作而没有冷脆性的铝合金,在其上应能焊接装有燃料和助燃剂的高密封性贮箱或其它焊接结构。能在这样低的温度下工作的铝合金有AlMg系(如LF5,5052,5086和5456)、 The rapid development of rocket technology urgently requires high strength, good welding performance, low sensitivity to stress corrosion, working at liquid hydrogen and liquid oxygen temperature without cold brittle aluminum alloy, on which should be equipped with fuel and combustion improver High sealing tank or other welded structure. Aluminum alloys that can work at these low temperatures include AlMg systems (such as LF5, 5052, 5086 and 5456)