Stirring tool for removing upper and lower shoulders after friction stir welding of double shoulders and its usage method

Abstract

The invention provides a stirring tool suitable for disassembling the upper and lower shoulders after friction stir welding of double-shaft shoulders in a closed ring seam and its use method. The double-shaft shoulder stirring tool consists of three parts: an upper shoulder, a lower shoulder and a stirring needle. The upper shaft shoulder and the stirring needle are clearance fit, the lower shaft shoulder and the stirring needle are connected by threads and the axial direction is limited by steps. After the double-shaft shoulder friction stir welding is completed, the head of the main machine continues to rotate and stays at the welding end position for 1 to 5 seconds; the head of the main machine and the retracting shaft drive the stirring tool up as a whole, and the lower shoulder and the stirring pin assembly move down as a whole, Make the upper and lower shaft shoulders separate from the material to be welded in a rotating state; after the upper and lower shaft shoulders are completely separated from the welded plate, the main shaft and the retracting shaft stop rotating, and use a disassembly tool to separate the lower shaft shoulder from the stirring needle; move the main machine head Pull out the upper shoulder and the stirring pin from the material to be welded, leaving only a keyhole with the diameter of the stirring pin on the plate to be welded.

Description

technical field [0001] The invention belongs to the field of welding, and relates to a stirring tool suitable for disassembling upper and lower shaft shoulders after double shaft shoulder friction stir welding of closed annular seams and a method of using the same. Background technique [0002] Double-shoulder friction stir welding is a new type of solid-phase joining technology. The agitation in the closed cavity composed of the material drives the flow of the material to form a solid-phase connection. [0003] The welding process can be divided into three stages, the plunge-in stage, the welding stage and the pull-out stage. In the pull-out stage, when the flat plate is welded, it can be directly drawn out from one end of the plate, and a gap will be left at the tail of the weld, but this is not suitable for closed welds. Usually, in the double-shoulder stir welding of the closed weld seam, after the welding is completed, the stirring tool stops at the welding end positi...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the stirring tool is difficult to disassemble during the pull-out stage of double-shaft shoulder friction stir welding of a closed weld seam, the present invention proposes a stirring tool suitable for disassembling the upper and lower shoulders after double-shaft shoulder friction stir welding of a closed circular seam and its use method

Images