At Belgorod State National Research University (BelSU), the technology for joining parts made of aluminum and titanium alloys for the aerospace and transport industries has been improved. This was reported in the press service of the university.
Parts made of aluminum and titanium alloys are used in the construction of aircraft. Reliable connection of these materials will allow creating high-strength and lightweight structures. Scientists have proposed to exclude direct contact of the working tool with the titanium workpiece, which led to excessive heat generation and the formation of a thick intermetallic layer.
The FSW technology involves mechanical mixing of two parts to be welded with a special tool that rotates at high speed. During welding, the materials of the parts are heated, and an intermetallic layer can form on their contact surface.
Instead, the parts are welded "overlapping". The aluminum workpiece is located on top, and the titanium one is on the bottom. The rotating tool is inserted only into the aluminum part, not reaching the titanium part by 50 microns. This avoids mechanical mixing of alloys with different bases, and the connection occurs due to the "penetration" of aluminum atoms into the surface of the titanium part.
The use of this approach can significantly reduce the temperature at the boundary of the parts and thereby reduce the thickness of the intermetallic layer. As a result, it was possible to achieve a significant increase in the strength of welded joints. During their mechanical tests, destruction was detected in the area of the original aluminum workpiece, and not in the area of the weld.
The developed method has undergone a full cycle of laboratory research at BelSU. In the future, scientists plan to test it in real production conditions.
Earlier www1.ru reported that it will protect aircraft engines from dust and debris: a new technology has been created in Russia that prolongs the life of the heart of metal birds.
Read materials on the topic:
Test bench for the TV7-117ST-01 turboprop aircraft engine from Il-114-300 developed in Russia
MAI has created a technology to protect aircraft skin from icing
Modernization: glazing for Russian MS-21 and SJ-100 aircraft will be produced even faster