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Problems We Solve

Component failure is usually due to a sequence or combination of events which can initiate from the design and choice of materials through to manufacturing processing and assembly including the application of heat, welding and grinding, as well as machining and distortion of the part due to bending, rolling or forging.

In services conditions can also contribute to the failure of a part such as variation in temperature and environmental conditions, uneven, high or low cyclic loads or stress profile, compression, torsion and bending as well as foreign object damage.  Matching the maintenance needs of the component to its operating conditions and environment is also important to reduce the effects of ageing and wear.

Curtiss-Wright Surface Technologies support every stage of the manufacturing process from design and new manufacture through to in service maintenance, repair and overhaul of components – increasing the strength and performance of parts and reducing costs and downtime.

Why do parts fail?

The table below gives a brief overview of typical components that we process, what failures they are susceptible to and the surface treatments available to prevent failure.

Note: Failure Modes and Solutions may be relevant for some or all of the components.

Aero-Engine

Blade roots
Air foils
Tie wire holes
Propeller blades
Turbine discs and blisks and drums
Rotating rings
Engine mounting brackets
PTO Gears

Failure modes

Fretting
Galling
Fatigue
Contact fatigue
Corrosion
Stress corrosion cracking
Micro cracking
Foreign object damage
Erosion
Water droplet erosion

Solutions

Controlled shot peening
Laser shock peening
C.A.S.E. isotropic superfinishing
Thermal spray coatings
Liquid coatings

Aero Landing Gear

Failure modes

Foreign object damage
Temperature variation
Fatigue
Tensile stresses from hard chroming process
Stress corrosion cracking
Fretting
Galling

Solutions

Controlled shot peening
HVOF WC coating

Airframe

Wing skins
Fasteners
Fuselage
Stringers
Spars
Bulkheads
Bolts

Failure modes

Fatigue
Flexural bending fatigue
Stress corrosion cracking
Lighting strike

Solutions

Controlled shot peening
Shot peen forming
Laser peening
Laser peen forming

Connecting Rods

Bore fillets
Feed rollers
Bearing races
Screw and oil holes
Contact faces
Radii’s

Failure modes

Residual compressive stress
Fatigue

Solutions

Controlled shot peening

Crankshafts, Camshafts, Axles

Crank pin bearing fillet
Keyways
Splines
Shear sections
Torsion bars
CV joint windows
Gears
Drive shafts

Failure modes
 

Fatigue cracking
Contact fatigue
Pitting

Solutions
 

Controlled shot peening
Laser Peening
C.A.S.E. isotropic superfinishing

Exhaust Stacks and Manifold Adapters

Flanges
Holders
Weldings

Failure modes
 

Heat variation

Solutions
 

Controlled shot peening
Laser Peening

Gas and Steam Turbines

Blade roots
Air foils
Diaphragm couplings
Rotors
Fir tree grooves
Locking nuts

Failure modes

Fretting
Cavitation erosion
Water droplet erosion
Fatigue
Stress corrosion cracking

Solutions

Controlled shot peening
Laser shock peening
Thermal spray – HVOF, Plasma and Flame spray

Gears and Gear Systems

Fillet at root
Flanks

Failure modes

Macro and micro pitting
Fretting
Fatigue

Solutions

Controlled shot peening
C.A.S.E. isotropic superfinishing

Medical Implants

Hip joints
Medical screws
Bars

Failure modes

Fatigue
Stress corrosion cracking
Fretting
Environmental attack

Solutions

Parylene coating
Controlled shot peening
Laser peening

Pipes and Tubes

Internal bores and surfaces
Oil well drill pipes
Cooling tubes – water walls and heat exchangers
Transmission shaft oil holes
Steam generator roll transition zone
Plastic pallet transportation

Failure modes

Corrosion
Stress corrosion cracking
High temperature corrosion
Fatigue
Fretting
Galling
Angel hair effect

Solutions

Controlled shot peening
Liquid coatings
Thermal spray coatings
Thermal barrier coatings

Springs

Compression/tension coil springs
Valve springs
Torsion springs
Disc springs
Leaf springs

Failure modes

Fatigue
Fretting
Corrosion

Solutions

Controlled shot peening
Liquid coatings

Steam and Gas Turbines

Blade roots
Air foils
Diaphragm couplings
Rotors
Fir tree grooves
Locking nuts

Failure modes

Fretting
Cavitation erosion
Water droplet erosion
Fatigue
Stress corrosion cracking

Solutions

Controlled shot peening
Laser shock peening
Thermal spray – HVOF, Plasma and flame spray

Valves for Compressors and Pumps

Flapper valves
Seals

Failure modes
 

Fatigue

Solutions
 

Controlled shot peening
C.A.S.E. isotropic superfinishing

Welded Components and Fabrications

Fillet weld toe profile
HAZ (Heat affected zone)

Failure modes
 

Fatigue
Stress corrosion cracking

Solutions
 

Controlled shot peening
Laser peening

Subsea Components and Structures

Christmas tree structures
Welds – heat affected zones
Seals
Connectors
Valves
Fasteners, threads and shafts

Failure modes
 

Environmental corrosion
Stress corrosion cracking
Pressure and hydrogen cracking
Galling
Fretting

Solutions
 

Controlled shot peening
Liquid coatings
Thermal Spray coatings
Cathodic protection
Zinc phosphate coatings

News

November 9, 2016

Surface World 2017, Birmingham >>

Curtiss-Wright Surface Technologies will be attending the Surface World Show at the NEC in Birmingham from 22nd to 23rd March 2017. Interested in finding more

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