Friction stir welding welding method and tool for non-inclination self-upsetting

Abstract

The invention relates to the technical field of welding, in particular to an aclinal self-upsetting, stirring and friction welding method and tool. The tool comprises a stirring head and a stirring needle, the stirring head is of a hollow structure, the stirring needle is rotatably arranged in the hollow structure of the stirring head and can stretch and retract in the stirring head, the axis of the stirring head and the axis of the stirring needle are overlapped, a shaft shoulder of the stirring head is provided with a forging boss, and the height of the forging boss is smaller than the height of the stirring portion left after the stirring needle extends out of the stirring head. In the whole welding process, a dip angle adjusting mechanism does not need to be arranged on equipment, complexity of the welding equipment is reduced, the angle between the shaft shoulder of the stirring head and a plane normal of a material to be welded is 0 degree, and accordingly aclinal stirring friction welding is achieved. When an aclinal stirring friction welding technology is adopted in two-dimensional plane welding, the angle of the stirring head does not need to be adjusted at a welding seam corner, welding procedures are reduced, meanwhile, the dip angle adjusting mechanism does not need to be arranged on the equipment, complexity of the welding equipment is reduced, and welding efficiency is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a non-inclination self-upsetting friction stir welding welding method and tools suitable for the connection of the same and different thermoplastic materials, material processing, and workpiece defect repair. Background technique [0002] Friction stir welding is a novel and potential welding method. This method uses a special tool - a stirring head, which rotates at high speed and penetrates into the workpiece. The contact part between the stirring head and the workpiece generates frictional heat. When the surrounding metal forms a plastic softening layer, it starts to move along the welding direction. The metal fills the cavity formed behind the stirring needle under the rotation of the stirring head, and is forged under the stirring of the stirring head shaft shoulder and the stirring needle and the top pressure to form a dense weld. This technology has shown a series of uni...

AI Technical Summary

Problems solved by technology

In straight seam welding, it is easy to maintain a fixed angle, but in plane two-dimensional welding, the inclination direction of the stirring needle needs to be adjusted at every turn of the weld seam, which reduces work efficiency. If the inclination angle is not adjusted properly or the accuracy is not high, prone to welding defects

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