A method for filling the keyhole of friction stir welding with solder extrusion-reflow

Abstract

The invention discloses a method of brazing alloy extrusion and backflow stuffing for carrying out stirring and friction of a welding keyhole. The method comprises the following steps that brazing alloy is preset in a keyhole, then a stuffing block is added in the keyhole, a T-typed stuffing block is subjected to rotation and friction through a needleless stirring head and is compressed down, the brazing alloy is heated to be softened, liquid brazing alloy is extruded and stirred by the stuffing block in an enclosed environment formed by the keyhole and the stuffing block, the liquid brazing alloy is stuffed in a driving and flowing way, and the liquid brazing alloy is enabled to be filled into a gap on the bottom of the keyhole; and due to the property of non-compression of the liquid brazing alloy, the liquid brazing alloy back flows along a side wall interface upward to stuff the remaining gap of the side wall, the side wall interface is dissolved, and compact alloying of the side wall and the bottom interface is realized. When the welding keyhole is repaired in batches, the replacement of tools is not needed, reduction of a welded keyhole does not exist or is extremely small, stuffing materials are saved, preset operation of the brazing alloy and the stuffing block is convenient, and the shaping of a surface of a stirring area is smooth.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and relates to a method for filling a friction stir welding keyhole by solder extruding and reflowing. Background technique [0002] At present, the methods of eliminating or filling the keyhole of friction stir welding mainly include: lead-out method, riveting method, fusion welding filling method, friction plug welding method, using retractable stirring head and filling friction stir welding method using semi-consumable combined stirring head. Plug welding. [0003] Zhang Guifeng et al. proposed "a method of filling friction stir welding keyholes with T-shaped filler blocks and needleless stirring heads". The feature of entering the keyhole, the effect of mechanical film removal on the side wall is better. However, due to the yield of the filling block in the later period, the mechanical stirring and torsion effect of the stirring shoulder on the sample decreases with the increase of th...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a method for filling the friction stir welding keyhole by filler metal extrusion-reflow, which overcomes the problem that the bottom and the lower part of the side wall cannot be filled even though the side wall is well bonded when only T-shaped filler blocks are used for all-solid filling. Dense Disadvantages

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