Q1: How is chemical composition verified?
Optical emission spectrometry measures elements within 0.001% accuracy. X-ray fluorescence provides non-destructive analysis of finished products. Glow discharge spectrometry detects trace impurities at ppm levels. Atomic absorption remains the reference method for certification. Laser-induced breakdown spectroscopy enables rapid scrap sorting.
Q2: What mechanical tests validate performance?
Tensile testing determines yield strength (0.2% offset) and elongation percentages. Brinell hardness testing assesses temper condition on thick sections. Charpy V-notch tests measure impact toughness at -40°C conditions. Fatigue testing applies cyclic loads to determine million-cycle endurance limits. Creep testing evaluates long-term performance at elevated temperatures.
Q3: How are internal defects detected?
Ultrasonic phased arrays map flaws in thick plates with 1mm resolution. Digital radiography reveals porosity in castings using computed tomography. Eddy current testing identifies surface cracks in tubing and extrusions. Liquid penetrant inspection highlights surface defects before finishing. Thermography detects delaminations in bonded structures.
Q4: What corrosion tests evaluate durability?
Salt spray testing (ASTM B117) exposes samples to continuous fog environments. Electrochemical impedance quantifies coating barrier properties. Galvanic corrosion testing identifies incompatible material pairings. Filiform corrosion testing evaluates painted systems under humidity cycling. Stress corrosion cracking tests apply tension in corrosive media.
Q5: How is dimensional accuracy maintained?
Laser scanners measure profile conformity within 0.05mm tolerances. Coordinate measuring machines verify geometric accuracy of complex parts. Inline X-ray thickness gauges control foil production in real-time. Surface profilometers measure roughness parameters (Ra, Rz). Optical comparators inspect extruded profile cross-sections.
