GE Aviation Advances Electron Beam Melting

Proving that companies willing to invest into research and development of a proven technology can still get ahead, GE Aviation just keeps on dropping the hits. Not only is the company building a brand new additive manufacturing (AM) factory it continues to push forward with new ways to leverage the power of AM.

This week, the breakthrough comes from a GE Aviation branch in Italy, Avio Aero. Researchers have developed a more powerful method of electron beam melting to build metal blades for jet engines. The beam is generated from a 3 kW laser and is, according to the company, 10x more powerful than comparable capabilities of any other AM system.

The increase in power has allowed Avio Aero to produce blades that are four times thicker than previously possible. A thicker blade means the company requires just 72 hours to build eight stage 7 blades for the low pressure turbine inside the GEnx jet engine. The new process is competitive in both time and money saved when compared to more traditional manufacturing methods.

“This is very competitive with casting, which is how we used to make them,” said Mauro Varetti, AM engineer at Avio. “Although the material is expensive, the weight savings and the fuel consumption savings tied to weight reduction more than pay for it.”

The weight savings come from using an alloy called titanium aluminide, which was designed for use in aerospace. The material can produce parts that are up to 50% lighter than those made using the general industry standard nickel-based alloys. In this case, total weight savings can reduce the weight of the entire low pressure turbine by 20%.

This fall, GE Aviation will begin testing the new blades for use in the GEnx engine at facilities in Peebles, OH. Blades made using the same process could also be used for the GE9X, a new jet engine being developed for Boeing’s forthcoming 777X.

This sort of progress is what you might expect from a company hoping to move units, rather than for in-house work. Nor is GE Aviation alone. Rolls Royce is also investigating how it can make AM part of its production process for jet engines.

Below you’ll find a short video about jet engines.

Source: GE