What strict quality inspection standards apply to finished aviation aluminum alloy products?

Each batch of aviation aluminum raw materials undergoes full-spectrum chemical analysis to limit harmful impurity elements such as iron and silicon. Metallographic examination detects grain size and forbidden brittle precipitates. Mechanical tests measure tensile strength, yield strength, elongation and high-low temperature fatigue life. Intergranular corrosion and stress corrosion cracking tests simulate flight atmospheric conditions. Ultrasonic flaw detection eliminates internal rolling and forging defects, as tiny material defects will expand rapidly under repeated flight loads and threaten aircraft operation safety.