How Turbine Makers are Benefitting from Induction Annealing

Turbine makers get immense benefits from stress-relieving by induction annealing with eldec MF generators: the technique ensures highly efficient annealing on Pelton turbines employed in hydroelectric power plants.

MF Generators Maintain a Fast Pace in Turbine Production

A few mechanical parts are available that have to withstand loads as great as those imposed on the Pelton turbines in hydroelectric power plants: First, the water gushes out under high pressure from custom designed nozzles, before hitting the individual blades at high speed. The blade that is “hit” initially drives the wheel a short distance, but becomes idle again for a revolution. This leads to high alternating forces in the blade’s root area.

Turbine makers anneal the weld between the blade and the turbine wheel in order to prevent fatigue fractures in this area. The durability of the part is considerably improved by this “gentle” heating process. However, it is essential to carry out the heating with high precision and repeatability to guarantee that turbine quality requirements are met.

In this context, it has been established that stress-relieving induction annealing using eldec’s MF generator has been shown to an ideal process. The device makes it possible to control heating through a practical LED display: Green means the temperature is just right, blue means it is too low, and red means the temperature is too high. In addition, the user benefits from the speed of the annealing process, which is completed in just a fraction of seconds. The process can be performed quickly, precisely, and with high energy conversion efficiency because the heat is produced directly in the workpiece through an alternating electromagnetic field.

Induction annealing with MF generators by eldec enables a custom configuration for turbine production at Pelton

Induction annealing with MF generators by eldec enables a custom configuration for turbine production at Pelton

MF generators ensure high speed and quality in turbine production

MF generators ensure high speed and quality in turbine production

Induction annealing significantly improves stability in turbine production

Induction annealing significantly improves stability in turbine production

Heat generation directly in the workpiece by means of an alternating electromagnetic field guarantees a fast, precise process

Heat generation directly in the workpiece by means of an alternating electromagnetic field guarantees a fast, precise process

Turbine blade

Benefits

  • High repeatability
  • Precise control
  • Customized configuration
  • Rapid annealing process
  • Economical energy consumption

Relevant Generators

This information has been sourced, reviewed and adapted from materials provided by Eldec Induction USA, Inc.

For more information on this source, please visit Eldec Induction USA, Inc.

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