A static shoulder friction stir welding method

Abstract

The invention relates to a static shaft shoulder friction stir welding method, which is characterized in that non-zero angle welding is adopted, and the stirring tool is lifted at a certain angle along the welding direction, so that the angle between the axis of the stirring tool and the welding plane is 90-α, Among them, α is the lifting angle, α=1°~2.5°, so that the first half of the static shoulder is slightly away from the welding plane, and there is a certain gap between the surface of the static shoulder and the weld. The invention greatly improves the welding seam formation of the static shoulder friction stir welding, reduces the probability of tunneling in the welding seam, no matter whether the solder is attached to the static shoulder during the welding process, it will not affect the formation of the welding seam, and at the same time broadens the static The process window of the shoulder friction stir welding ensures that the shape of the weld seam truly reflects the influence of the welding process parameters on the welding effect.

Description

technical field [0001] The invention relates to a static shaft shoulder friction stir welding method, which belongs to the technical field of friction stir welding. Background technique [0002] Static shoulder friction stir welding is a new type of friction stir welding technology. Since the shoulder does not rotate with the stirring tool during the welding process, the heat input generated is small. It is suitable for materials with low thermal conductivity, and the smoothing effect of the static shoulder makes The surface of the weld seam is flat and smooth. However, static shoulder friction stir welding is an emerging technology. The published data at home and abroad show that this technology only stays in the laboratory, and there are no examples of large-scale engineering applications. The research and application are still immature. [0003] At present, in the research of static shaft shoulder friction stir welding welding method at home and abroad, zero-angle weldin...

AI Technical Summary

Problems solved by technology

However, static shoulder friction stir welding is an emerging technology. The published data at home and abroad show that this technology only stays in the laboratory, and there are no examples of large-scale engineering applications. The research and application are still immature.

[0003] At present, in the research of static shaft shoulder friction stir welding welding method at home and abroad, zero-angle welding is mostly used, that is, the stirring tool is perpendicular to the weld plane, but the disadvantage of this method is that at the initial stage of welding, some materials of the weldment will stick "Scratches" the weld on the shoulder surface, causing severe tunneling on the weld surface

[0004] However, the above method does not take into account the welding angle of the machine head, the success rate is not high, and it will also reduce the process window of static shoulder friction stir welding, so that some applicable process parameters cannot be used

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