Research on the influence of the friction coefficient in inertial friction welding on the deformation of gas turbine engine parts

Аuthors

Rabinsky L. N.^*, Fozilov T. T.^**

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: rabinskiy@mail.ru
**e-mail: fozbourne@yandex.ru

Abstract

This paper presents the results of a review of analytical methods for determining the unknown friction coefficient of new nickel-based superalloys. The study included theoretical calculations of heat fluxes, the total moment of inertia, and the total torque. Ansys models were also used to determine the influence of the friction coefficient on weld joint quality and upsetting. The calculations were performed on heat-resistant nickel-based alloys welded on a domestically produced PSTI-400 friction inertia welding machine. The friction coefficient changes in two directions during welding. The first direction is set from the axis of rotation toward the outer diameter of the ring. At this edge, the friction coefficient is highest. This occurs because the outer contour of the specimen is cooled by external influences and is as far removed from the heat source as possible, subjecting the metal to tensile stresses. The situation is reversed at the edge of the inner diameter. When plotted, the dependence will have a parabolic shape. The second direction is considered at the point of contact, specifically at three stages of welding itself. In the initial stage, up to 100-200°C, the friction coefficient decreases slightly, as microroughness is smoothed out, thereby reducing the coefficient. In the second stage, it increases sharply (by 2-10 times) due to the formation of adhesion points and their rupture. In the plasticized state, during the third stage of forging, the friction coefficient increases again, but slightly and not intensely, and then decreases, due to the removal of oxides and their debris from the weld joint.

Keywords:

friction coefficient; moment of inertia; inertial friction welding; thermal deformation effect of welding

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