Repair welding method and welding tool of stirring friction plug for friction preheating of telescopic shaft shoulder

Abstract

The invention provides a repair welding method and a welding tool of a stirring friction plug for friction preheating of a telescopic shaft shoulder, which relates to a repair welding method and a welding tool of a filling type stirring friction plug. The invention solves the problems that in the repair welding process of the filling type stirring friction plug, strong resistance causes a stirring needle to be broken when the stirring needle does not completely plastic deformation so that the continuous fluidity of materials is poor. The method comprises the following steps: (1) taking the same materials for the stirring needle and the repair welded part; (2) punching a conical defect repair preset hole; (3) determining the size of the stirring needle; (4) positioning the conical defect repair preset hole; (5) preheating by friction; and (6) carrying out repair welding. The welding tool is characterized in that an upper circular ring on the telescopic shaft shoulder is connected with a lower cylinder on a clamping body of the welding tool through a key, a spring is arranged between the upper end surface of a lower circular ring on the telescopic shaft shoulder and the lower end surface of the lower cylinder, the lower cylinder is connected with the outer surface of the lower circular ring by a limiting plate, and a stirring body is arranged in a clamping hole on the clamping body of the welding tool and a through hole on the telescopic shaft shoulder. The invention is used for stirring friction welding of welded seam keyholes and repair welding of defects.

Description

technical field

[0001] The invention relates to a filling type friction stir plug repair welding method and a welding tool thereof, which are used for repair welding of keyholes and defects of friction stir welding welds. Background technique

[0002] Since the British Welding Institute (TWI) invented the friction stir welding method in 1991, this technology can eliminate welding defects such as pores, inclusions, cracks, etc. And it does not produce arc light, smoke, noise pollution, etc., and at the same time can significantly reduce costs, save materials, optimize structures, and reduce the structural weight of aircraft, etc., which have attracted the attention of scientific research institutions in various countries. Because this technology has many remarkable features that other methods do not have, it will soon be used in the aerospace field, and this method is selected for the welding of the longitudinal seam of the core tank section of the new generation of launch ve...

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