Manufacturing technology and welding of aluminum alloys electrodes containing nanopowders

In the manufacture of aircraft structures made of aluminum alloys used is the welding, physical essence of which is to obtain a permanent connection by melting and co-crystallization of the welding electrode materials and parts to be joined. However, while the structure of the weld and the joined parts of the influence of heat coarsen, which leads to a reduction in the mechanical properties of the welded articles. It is known that metal with fine-grained structure has higher mechanical properties compared to coarse. Thus in practice, for the purpose of foundry castings structure refinement modification is used, the essence of which consists in introducing alloys into the liquid metal using substances which serve as crystallization centers. However, the possibility of modifying such agents has reached the limits in recent years and a new method of modifying the application using nanopowders (NP) chemical compounds (nitrides, carbides, borides, oxides), which gives a high effect of enhancing the mechanical properties of the molded articles has been found. It should be beared in mind that the mechanism of crystallization of molded articles and weld identical technology modifying liquid alloy was used to grind the weld structure in the manufacture of a welded structure of the aircraft from the example sheets of aluminum-magnesium alloy AMg6 with welding rods containing NP. The test results are cut from the welded structure samples showed that s metal at the weld joint during the welding rod comprising NP BN, is 333 MPa, LaB6 - 338 MPa, TiCN - 345 MPa. These values were higher than 4.1, respectively; 5.6 and 7.8 %, than the samples have AMg6 alloy (320 MPa), welded by the standard electrode of the same alloy. The development is protected by patents of the Russian Federation.