Laser Peening vs. Other Technologies

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Make The Switch To Laser Peening

Laser shock peening emerged as a necessary application for parts requiring greater fatigue enhancement than shot peening and other technologies could provide.

Other Surface Enhancement Technologies

  • Shot peening is one of the original surface modification technologies developed for improving fatigue life via induced compressive stress. The process of shot peening involves accelerating a hard media (metal, ceramics, etc.) toward a part surface at high velocities. Impacts of the media with the part surface induce plastic deformation and resulting compressive residual stresses. Shot peening continues to be a popular surface modification technology; however, the depths and magnitudes of residual stress benefits obtained with shot peening are greatly exceeded by laser peening.

  • Deep rolling is a surface burnishing process that creates a high degree of cold work. Resulting residual stresses are frequently deeper than shot peening. Like other burnishing processes, deep rolling requires sufficient access to an area and is limited on geometric areas that can be processed. The high degree of cold work also limits the process for elevated temperature applications. Limitations of the burnishing process make laser peening a better option for many applications.

  • The low plasticity burnishing (LPB) process is similar to other burnishing processes in which a metal object in contact with the surface of a part is forcefully passed over the desired area. The end result is usually a surface compressive stress and finer surface finish than when the process was initiated. In LPB, the ball is maintained in a spherical socket with fluid supplied to the top of the ball. Fluid pumped to the socket applies the force and helps prevent the ball from contacting the socket directly. A fluid film allows the ball to roll across the surface of a part and helps to reduce the risk of the ball seizing in the socket.

  • Ultrasonic peening is a surface enhancement process that uses electro-mechanical methods to generate stress waves in a material. Stress waves are induced into the material by vibrating steel pins attached to a calibrated frequency controller.  Most ultrasonic peening tools are handheld apparatuses and the technology has been heavily used in the welding industry.

    Advantages of the process include the ability to be highly transportable, leading to the ability to reach austere environments.

    Disadvantages include a need for physical contact with a surface, limiting the process to open geometries and generally flat surfaces. The use of handheld tools also poses difficulties with repeatability and consistency. Ultrasonic treatments roughen the surface finish considerably. In comparison to laser peening, ultrasonic peening has been unable to reach similar compressive stress depths.

  • Water jet peening and cavitation peening are terms used to refer to generally the same process. This type of peening uses a jet of high pressure water to impinge the part surface. Upon contact with the surface, the water droplets cavitate and induce stress into the part surface. The advantage of water jet peening over shot peening is due to the limited effect upon surface finish. The water jet peening system also requires only water as a media and has some environmental benefits. Disadvantages of water jet peening include the potential for erosion and cavitation damage, material loss and limited residual stress profiles.

Advantages of Laser Peening

Why would you consider using laser peening? Because it’s being used today to improve the safety and reliability for components in industries that are counted on everyday for commercial, residential, and government use. Laser peening provides a trusted solution unmatched by common technology.

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Laser peening has been shown to provide over 10x life increases for components that had previously only been shot peened. This type of service life extension is unparalleled among surface enhancements, and has the power to revolutionize many industry practices. Not only will laser peened parts last longer, but they can be manufactured with less material to reduce costs and improve efficiency.

Beyond enhanced fatigue resistance and service life, laser peening has proven superior to shot peening across a number of performance-related applications:

  • Retains compressive residual stresses to higher temperatures
  • Reducing crack growth rates (da/dN)
  • Improving life of welded components
  • Improved fretting damage resistance
  • Improved galling resistance
  • Improved spallation resistance
  • Improved stress corrosion (SCC) resistance

Laser peening consistently outperforms shot peening when it comes to the material enhancement properties associated with compressive residual stresses.

The Laser Peening Difference

See real-world examples of how laser peening outperforms other surface enhancement technologies, like shot peening.

Laser Peening is the Superior Solution

When other technologies aren’t cutting it, it’s time time to consider the leading technology for metal surface enhancement. Laser peening has a proven reliability when it comes to providing fatigue cracking resistance. Our technology is being called upon across a variety of industries due to the unmatched compressive residual stress profiles.

The potential cost savings and benefits of increasing component lifetimes extend far beyond the value of the part itself.

Let’s talk about implementing laser peening into your process.

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