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What is shot peening ?

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  • What is shot peening ?

What is shot peening – ultrasonic shot peening ?

Our shot peening process is used to improve:

  • Fatigue resistance
  • Resistance to stress corrosion cracking and contact fatigue

This surface impact treatment solution consists in bombarding the specific area to be peened with small projectiles (= media). This action induces residual compressive stress on the surface, which delays the appearance of cracks, and improves the lifetime of the part. This is a cold working and work hardening process.

0 - ENG - Portative Ultrasonic Shot Peening - SONATS

Download our dedicated brochure on portative Ultrasonic Shot Peening 

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Browse the tabs below to explore in detail principle, methods, advantage and certification of shot peening.

  • PRINCIPLE
  • METHODS
  • ADVANTAGES
  • CERTIFICATION

PRINCIPLE

Principle of shot peening, work hardening and cold working process.

J.Almen discovered shot peening in the 1930s while working for General Motors.

Shot peening is a process used to induce superficial compressive stress, and to modify the mechanical properties of metals. The method consists in striking a surface with projectiles (metal, glass or ceramic beads) at high speed, with sufficient force to create a plastic deformation: each ball acts like a mini-hammer.

Objective of shot peening

Shot peening, due to the successive impacts, causes changes in the mechanical properties of the surface. Shot peening is often required for repairs to fragile areas, to compensate for tensile stresses due to machining and to replace them with compressive stresses.

Shot peening can improve fatigue resistance from 0 to 1000%. But this depends of:

  • the part geometry and material
  • the projectile material,
  • the projectile quality,
  • the projectile intensity
  • it field of action

The compressive surface stresses create fatigue resistance and resistance to certain forms of stress corrosion cracking., mains advantages or this work hardening and cold working process.

Webinar - Shot peening - Automotive industry

WEBINAR REPLAY

Watch the replay of our webinar on  Shot peening innovations for high-performance transmission parts. 

MFN – NEW ARTICLE
“Flexible, Portable and Automated : Shot Peening at its best”

Our process manager explains the benefits of the ultrasonic shot-peening technology and applications for the aeronautical and automotive industry.

Download

METHODS

Conventional methods of shot peening propel projectiles using compressed air and centrifugal wheel systems. Other methods include ultrasonic shot peening, wet shot peening and laser peening (which does not use projectiles).

SONATS specialises in ultrasonic shot peening, STRESSONIC® technology has matured and has proven its advantages.

ADVANTAGES

Advantages of shot peening

SONATS provides innovative ultrasonic shot peening equipment. The equipment is developed using STRESSONIC® technology and offers new solutions to overcome the limits of conventional shot peening. This means:

Increased productivity and quality

  • improved fatigue resistance
  • processing of complex geometry parts
  • low roughness

Lower costs

  • shorter treatment cycle
  • reduction in the amount of medias, energy and compressed air used
  • easy integration into the production line
  • treatment often possible in-situ without dismantling equipment to isolate the work piece

Moreover, the use of high quality beads and real-time parameters control ensure repeatability and treatment efficiency.

Ultrasonic shot peening generates an optimal surface condition (roughness) and is generally better than conventional shot peening processes.

Comparison of surface condition (roughness and shot peening post-treatment) on two 7000 series aluminium strips with identical shot peening intensity (12A)

Comparison of surface condition (roughness and shot peening post-treatment) on two 7000 series aluminium strips with identical shot peening intensity (12A)

TECHNICAL AND SCIENTIFIC PUBLICATION

Consult publications about ultrasonic shot peening process (simulation, improvement of fatigue effects, nanocrystallisation, ceramic shotpeening…)

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Comparison of gear residual stress profiles before and after shot peening
Comparison of gear residual stress profiles before and after shot peening with STRESSONIC® technology

CERTIFICATION

CERTIFICATION

Our machines are certified according to the following aeronautical recommendations :

  • SAE/AMS – AMS 2430 Shot peening, Automatic
  • SAE/AMS – AMS 2432 Shot peening, computer monitored
  • SAE/AME – AMS 2580 Shot peening, ultrasonically activated
  • SAE/AME – AMS 2585 Shot Peening media – ultrasonically activated
  • BNAE-NFL 06 833  Aerospace series – ultrasonic shot peening
To find out more about the ultrasonic shot peening process, its advantages and examples of use-cases, download our flyer.

SONATS provides a wide range of solutions to meet your needs:

Standard portable equipment,  for localised shot peening operations

Sous-traitance d'un traitement de grenaillage de précontrainte (shot peening) loca in-situ - SONATS

Customized machines, designed according to the specific needs of our customers

Customized machine – Shot peening treatment for transmission shaft - SONATS

Services and sub-contracting on our premises or at your site

Shot peening services and subcontracting – SONATS

Access to all our download resources

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