Vibration stress relief
Previously, for the stress relief of welded structures and pieces aging and the heat-treatment were used. The first one was time-consuming, and the second one costly. On our continent, even today the stress relief with heat-treatment is the prevalent method, which is reliable though, but has its limits. At the heat-treatment procedure the particles are wabbled by heating to restore them. The higher temperature there is, the higher frequence are the particles oscillating on. The americans have reversed the process a long time ago: they vibrate the piece itself, and the changing frequences of vibrations will relief the stress caused by the welding. The process is also true the other way around. We can apply it during or after the welding or after cutting or even after building back the part to its place.