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  • The blades are retained in their respective grooves by a variety of methods, the more common of which are peening,
  • welding, lock tabs, and riveting.  turbine wheel using rivets for blade retention.
  • The peening method of blade retention is used frequently in various ways.
  •  One of the most common applications of peening requires a small notch to be ground in the edge of the blade fir-tree root prior to the blade installation.
  •  After the blade is inserted into the disk, the notch is filled by the disk metal, which is “flowed” into it by a small punch-mark made in the disk adjacent to the notch.
  • The tool used for this job is similar to a center punch.

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