退役飞机材料中铝合金薄壁件占有很大比例，无法直接利用，必须进行重熔处理。其熔炼困难之处在于：①壁薄，炉料级别高（多为三级）；②经过特殊处理的铝合金表面氧化严重；③合金中镁量高。所以，对此类铝合金材料必须进行特殊的工艺处理。其主要工序如下：清理表面→打捆→ Retired aircraft material aluminum alloy thin-walled parts account for a large proportion, can not be directly used, must be remelted. The smelting difficulties are: ① thin wall, the charge level is high (mostly three); ② specially treated aluminum alloy surface oxidation; ③ high magnesium alloy. Therefore, for such aluminum alloy material must be special process. The main process is as follows: clean the surface → bundled →