In addition to the mere replacement of components that are subject to operational stress, the refurbishment of worn components makes sense, since complex capital goods usually contain very valuable individual parts. Replacing them with new parts consumes valuable resources and causes high costs. The functionality of the turbine and compressor systems is restored with a successful regeneration of individual parts that are subject to operational stress. In order to be able to achieve this, a large number of interlocking manufacturing processes are required.

The special processes used by OT Schwerin are technically highly demanding and are listed below:

Component cleaning

  • Blasting with aluminum oxide & glass bead
  • Kolen cleaning in the salt bath
  • Verse cleaning, if necessary with ultrasound support
  • Cleaning with citric acid
  • Pickling with phosphoric acid


Photo: Working on a manual blast cabin


  • Chemical stripping (hydrochloric acid)
  • Mechanical stripping (grinding / milling)
  • Mechanical blasting stripping (high-grade corundum)
  • Local electrochemical decoating (ECM)


Photo: Plant for chemical stripping (stripping) of MCrAlY coatings that have been subjected to operational demands

Heat treatment

  • Vacuum heat treatment (according to aviation standard AMS 2750E)
  • Atmospheric heat treatment
  • Stationary and mobile heat treatment


Photo: Heat treatment of GT high-temperature components in a vacuum furnace, optional vacuum hardening


  • Arc welding
  • Manual metal arc welding
  • Manual tungsten inert gas welding (TIG)
  • Laser wire welding (LWW)
  • Laser powder welding (LPW)


Photo: Laser wire welding of gas turbine high temperature components

Non-destructive testing

  • Visual examination (VT)
  • Surface crack test (PT) - fluorescent
  • Magnetic crack test (MT)
  • Eddy current testing (ET)
  • Ultrasonic testing (UT)


Photo: Equipment for non-destructive testing (NDT), here: surface crack testing using the fluorescent penetrant method (PT)


  • Specimen evaluation and
  • Quality assurance by in-house metallopraphic laboratory


Foto: Metallographic specimen evaluatuion by materials testing engineer