Middle wire filling type negative-pressure-in low-acting-force stirring friction welding method and device

Abstract

The invention relates to a negative-pressure-in low-acting-force thin plate stirring friction wire filling welding method. A wire feeding mechanism, a stirring tool, a wire and a forming piece are included, the wire feeding mechanism at least comprises a feeding wheel set and a wire guide cylinder, and the stirring tool at least comprises cooling fins, a shaft shoulder, a hollow stirring needle and a friction inner neck. During welding, the stirring tool rotates at a high speed and advances in the direction of a welding seam, the stirring needle is partially inserted into a to-be-welded workpiece, a certain gap is formed between a shaft shoulder plane and the to-be-welded workpiece, a wire feeding wheel set feeds a wire along the static guide cylinder, at a friction inner neck part of the stirring tool, the wire and the stirring tool rotating at a high speed generate heat through friction under huge feeding pressure, and then the wire is plasticized, extruded along the hollow stirring needle to enter a gap between the shaft shoulder plane and the to-be-welded workpiece and fused with a plasticized material of the to-be-welded workpiece to form a welding seam. According to the middle wire filling type negative-pressure-in low-acting-force stirring friction welding method and device, the problem that traditional thin plate stirring welding is large in acting force and prone to deformation is solved, and the welding seam quality of thin-wall aluminum alloy welding and the welding process stability are improved.

Description

technical field [0001] The invention belongs to the technical field of solid-phase welding, and in particular relates to a method and equipment for friction-stir friction wire-filling welding with negative pressure input and low force. Background technique [0002] First of all, traditional friction stir welding generates frictional heat through the frictional shear resistance between the stirring head and the material to be welded, so that the material in the vicinity of the stirring head is softened by heat and then thermally plasticized, which is realized under the action of mechanical stirring of the stirring head and shoulder forging The solid phase connection of the workpiece usually requires a large axial forging pressure, so the thin plate stir welding is easy to cause curling deformation of the workpiece to be welded. Furthermore, 70-80% of the frictional heat in the stirring welding process is generated at the friction interface between the rotating shaft shoulder ...

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem of large force and easy deformation of traditional stir welding thin plates, realizes friction stir welding without thinning, and improves the weld seam quality and welding process stability of welding thin-walled aluminum alloys

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