Q1: What spectroscopic techniques verify composition?
Optical emission spectrometry quantifies alloying elements within 0.01% accuracy. X-ray fluorescence provides non-destructive analysis of finished products. Glow discharge spectrometry measures ultra-low impurity concentrations. LIBS (Laser-Induced Breakdown Spectroscopy) enables rapid inline sorting during recycling. Atomic absorption spectrometry remains the reference method for certification.
Q2: How are mechanical properties validated?
Tensile testing determines yield strength (0.2% offset) and ultimate strength. Brinell hardness testing assesses temper condition on thick sections. Charpy impact tests measure notch toughness at subzero temperatures. Fatigue testing applies cyclic loads to determine endurance limits. Creep testing evaluates long-term performance at elevated temperatures.
Q3: What non-destructive testing methods detect flaws?
Ultrasonic phased arrays map internal defects in thick plates and forgings. Eddy current testing identifies surface cracks in extruded profiles. Digital radiography reveals porosity in cast components. Liquid penetrant inspection highlights surface-breaking defects. Thermography detects delaminations in bonded structures.
Q4: How is corrosion resistance evaluated?
Salt spray testing (ASTM B117) assesses baseline performance in controlled environments. Electrochemical impedance spectroscopy quantifies coating barrier properties. Galvanic corrosion testing identifies incompatible material pairings. Filiform corrosion testing evaluates painted systems under humidity cycles. Stress corrosion cracking tests apply tension in corrosive media.
Q5: What dimensional control systems ensure precision?
Laser scanning measures profile conformity within 0.05mm tolerances. Coordinate measuring machines verify geometric accuracy of formed parts. Inline thickness gauges control foil production within ±0.001mm. Surface roughness testers quantify finish parameters (Ra, Rz). Optical comparators inspect extruded profile cross-sections.
