A Method of Filling Welding Keyhole Using Stir Friction

Abstract

The invention discloses a method for filling a welding keyhole by stirring friction. The method comprises the following steps: 1) a stirring head is inserted into a machining allowance layer obliquely relative to the normal line of the workpiece welding surface; 2) a stirring head located in the machining allowance layer The end of the head moves to the position of the keyhole in the machining allowance layer; 3) The stirring head returns to the center, and its axis coincides with the center of the keyhole; 4) Lift the stirring head, and the filling of the keyhole is completed. This filling method takes advantage of the fact that the frictional heat can soften the material of the workpiece when the stirring head rotates in the workpiece. Through the movement of the rotating stirring head, the softened machining allowance material on the surface of the workpiece is transferred to the keyhole. After the combined movement of the rotating head, the The softened material fills the keyhole.

Description

technical field [0001] The invention relates to a method for filling a keyhole, in particular to a method for filling a welding keyhole by using friction stir, and belongs to the technical field of friction stir welding. Background technique [0002] The so-called friction stir welding refers to the use of heat generated by the friction between the high-speed rotating welding tool and the workpiece to locally plasticize the welded material. When the welding tool moves forward along the welding interface, the rotational friction of the plasticized material in the welding tool Under the action, it flows from the front of the welding tool to the rear, and forms a dense solid-phase weld under the extrusion of the welding tool. Specifically, the welding process of friction stir welding is that a stirring needle (threaded cylinder or other shape) penetrates into the joint of the workpiece, and through the high-speed rotation of the stirring head, it rubs against the workpiece mate...

AI Technical Summary

Problems solved by technology

[0006] 1) During closed-loop weld welding, the stirring needle will continue to move forward at the welded seam position after the welding is completed. During the forward process, the stirring needle will be slowly extracted, and the welded seam will be welded twice. Increased risk of defects in welds;

[0007] 2) The process of slowly extracting the stirring needle must be very slow, and at the same time, the advancing speed of the stirring head and the stirring speed must be matched very accurately, otherwise tunnel holes will be formed in the weld area, and the process is very difficult

[0008] 3) Since the stirring pin is extracted slowly, it is required to take a long welding distance and take a long time when extracting the stirring pin

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