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High value-added casing manufacturing meeting the most demanding quality standards.

Our expertise in the production of sub-assemblies or casings

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Defontaine provides specific expertise in the manufacture of casings for demanding applications. We master several manufacturing processes in order to produce machined or complex mechanical casings.

Defontaine uses foundry blanks or forged blanks supplied by our qualified partners to carry out high-precision machining and meet our customers’ requirements. Various special processes (thermal spraying, painting, anodising, etc.) and component assembly can complete the service offered by Defontaine, upon specific request.

For the manufacture of complex mechanical casings, Defontaine offers a full service including the manufacture of flash-butt welded flanges. 

The flanges are assembled by TIG welding, FE welding, with various components from foundry, sheet metal, forged blanks or bosses. 

These highly technical assemblies are completed by machining phases, heat treatments if necessary and the use of special processes.

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Our casings

Casings for the aerospace sector

Defontaine manufactures casings for civil and military aircraft engines, helicopter turbines and auxiliary power units (APUs). 

This extensive expertise enables us to meet the needs of our customers for highly technical and complex projects. Providing cost-effective and robust solutions is our priority.

Defontaine is present on the following segments:

  • Combustion chamber outer casing
  • Free or high-pressure turbine casing
  • Air inlet casing
  • Gas turbine casing
  • Blower casing
  • Aerospace casing
  • Mechanical casing
  • etc.

The Defontaine flash-butt welding and machining processes can be used with various aerospace materials such as stainless steel, cobalt, titanium, aluminium and nickel alloys.

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Our expertise for all your projects

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Defontaine has developed high-performance equipments to produce key aerospace industry components: machined casings, shields, free turbines or complex mechanical casings

Our flash-butt welding and machining process handles many types of aerospace industry materials (stainless steel, nickel alloys, cobalt, titanium, aluminium, etc.). Our manufacturing facilities are designed to allow for and optimise the production of casings from 150 mm to 2000 mm in diameter.

Defontaine’s organisation allows to meet the needs and technical constraints of our customers: from the fast-make prototyping phase to series production phase with flexible or dedicated resources.

Our commitment

We guarantee our customers 100% OTD (On-Time Delivery), with:

  • expertise in materials and flash-butt welding and machining
  • management of the supply chain
  • our zero defect principle
  • understanding the technical specifications of each of our customers

Our qualifications are based on both the EN9100/AQAP quality management system and NADCAP on the special processes used. Our skills are enhanced by specific qualifications issued by major manufacturers and our mastery of strict export control rules.

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Discover our sectors of expertise

DOWNLOAD FILE: General brochure - EN

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Associated services

Study & design



Spares & Services


Defontaine specialises in the production of casings and will provide the guidance you need to find the most suitable solution for your application. We support you to optimise your performance.

Our engineers and technicians are involved as from the project phase and work in collaboration with your technical and quality teams. Together, we will optimise the production of your products based on an eco-design culture.

Our key processes

Roulé-soudé par étincelageFlash-butt welding
Usinage et rectification de précisionPrecision machining and grinding
Trempe sous pressePress quenching
Traitement thermique par inductionInduction heat treatment
Procédés spéciauxSpecial processes

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