Tests on Assemblies

Check welded assemblies, appraise them in the event of failure and qualify procedures.

Tests objectives :

• Advise and participate in the development and validation of specifications
• Assist in the finalisation process (feedback, failure analysis and fatigue)
• Develop welding records
• Qualify welding procedures
• Verify compliance of assemblies (acceptance record)
• Appraise and analyze failures
• Qualify finishing processes of welding beads
• Ensure the development of finishing methods

Tests facilities :

• Tension/compression and bending machines
• Hardness testing machines, pendulum, optical microscopes, etc.
• Scanning electron microscope
• Portable diffractometer to assess residual stresses
• Electron microscope

Testing norms :

EN 15085 -1 à 5- Welding of railway vehicles and components

EN ISO 15614- Specification and qualification of welding procedures for metallic materials – Welding procedure test

Assess, qualify and verify bolted assemblies, analyze their weaknesses and propose solutions.

Tests objectives :

• Qualify bolted assembly procedures
  – Study bolt assembly procedures via clamping (on site or in laboratory)
  – Study the behaviour of assemblies in revenue service
• Check the conformity of products (tooling, nuts and bolts, etc.)
• Fix bolted assembly dimensions
  – Conduct failure analyzes

Tests facilities :

• Ultrasonic and strain gauge testing equipment for measuring clamping forces
• Test rigs for bolted assemblies
• « Torque/angle » analyses
• Scanning electron microscopy, micrography, hardness, tension
• COBRA calculation tool

Testing norms :

STMX 810- Recommendations for bolted and screwed connections of components used in passenger rolling stock

ST 001- Fasteners, etc.

EN ISO 898-1-

EN ISO 898-2

Contributing to the qualification of bonded assemblies.

Tests objectives :

• Vérifier des assemblages collés sur revêtement de sol, mastics de vitrage,…
• Réaliser des essais de caractérisation (traction, cisaillement, pelage, vieillissements)

Tests facilities :

• Machine de traction/Compression : essai de traction, cisaillement, pelage, adhésivité…
• Enceintes de vieillissement : chaud, froid, humidité
• Dispositif de chocs thermiques : chaleur avec ou sans humidité / froid

Testing norms :

NF EN 1372- Pelage

NF EN 1465- Cisaillement

NF EN ISO 9142- Vieillissement