Fasteners
Assessing the conformity of a production lot requires accurate testing activities on fasteners, in accordance with the requirements established by specific standards such as ISO and NAS. TEC Eurolab offers integrated technical support for quality control of fasteners, combining the performance of mechanical and nondestructive testing with failure analysis, managing the entire process from problem identification to operational resolution.
In order to certify the strength and reliability of critical components, such as screws, bolts and studs, it is essential to structure an analytical plan that includes different types of investigations, allowing for:
- Verify parameters and compliance with standards
- Evaluate issues and study evolutions on the product
- Detect surface and internal defects on raw materials and finished parts
- Characterize surface finish, coatings, paints, lubricants
- Characterize the mechanical properties of fasteners
- Characterize the torque properties of fasteners
- Simulate and measure characteristic assembly parameters
- Analyze heat treatment, operation verification and near surface examination
Chemical analysis
- Chemical Analysis (ICP-EOS, XRF, SPARK-OES)
- Gas Content (C, H, S, N)
- Positive Material Identification (PMI)
- SEM analysis of the surface
- Near-surface chemical analysis (EDS -XPS)
Metallographic analysis
- Metallurgical testing of microstructure
- Decarburation / Recarburation
- Grain Flow
- Alpha Case
- Defect detection, classification and measurement
- Hardness testing
- Evaluation of corrosion resistance (NSS, IGA / IGO etc)
- Coating thickness assessment
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Mechanical testing
Materials characterization
- Tensile testing
- Single or double cut test
- Fracture mechanics
- Fatigue test and value determination Wöhler curve
Measuring assembly parameters
- Torque check
- Stress Embrittlement
- Hydrogen embrittlement on fasteners
Twist
- Locking / Breakway torque
- Torque off / Torque out
- Cross recess torque
- Wrench torque / Torque effectivity / Installation
- Self Locking Torque
Non-destructive testing
- Liquid penetrant inspection (PT)
- Magnetoscopic examination (MT)
- Induced Currents (ET)
- Ultrasound (UT)
- Radiographic method (RT)
- Tomography (CT)
Dimensional checks
- Three-dimensional coordinate machine (CMM)
- Laser probing anthropomorphic arms
- Roughness and roundness gauges
- Manometers
Mechanical fatigue test on fasteners
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