A Filling Type Friction Spot Welding Method with Outer Shaft Rotation

Abstract

The invention proposes a filling type friction spot welding method in which the outer shaft rotates. The method includes a stirring needle, a stirring sleeve, an outer shaft sleeve, an upper support block, and a lower support block, and the stirring needle is installed in the stirring sleeve, and the stirring sleeve is installed In the outer shaft sleeve, the outer shaft sleeve is installed in the upper support block as a compression sleeve. Stirring needle, stirring sleeve, and the working end surface of the outer shaft sleeve are in contact with the upper surface of the weldment and rotate at a high speed. The friction generated makes the weldment form a plastic area and gradually expands. Through the relative axial movement of the stirring needle and the stirring sleeve, the plastic material flows After the cavity formed by the stirring needle and the stirring sleeve is filled, the rewelding parts are filled again. When the stirring needle, the stirring sleeve and the outer shaft sleeve stop rotating and cooling, a solder joint is formed. In the present invention, because the outer shaft participates in frictional heat generation, the outer contour of the stirring sleeve is no longer the boundary of the friction area, the temperature of the contour interface is reduced, and the structure of the welding spot workpiece tends to be stable, thereby solving the problem of German filled friction spot welding technology The deficiencies in the existing method have achieved beneficial effects such as reducing the load of the spot welding tool, improving the strength of the welding spot, speeding up the welding speed, and ensuring the flatness of the workpiece surface.

Description

A Filling Type Friction Spot Welding Method with Outer Shaft Rotation technical field The invention relates to the field of welding technology, in particular to a filling type friction spot welding method in which an outer shaft rotates. Background technique Filled friction spot welding technology is a new solid-phase welding technology. It is a method involving solid-phase spot welding invented by the German GKSS Research Center in 1999. It softens the welding base metal through frictional heat and stirs plastic flow. Metal, dynamically recrystallized and forged to form an integrated solder joint. It has the advantages of high solder joint strength, energy saving, environmental protection, and simple process, and can widely replace resistance spot welding and riveting. The invention patent (US 6,722,556B2) applied by the German GKSS Research Center in 2004 introduced the filling friction spot welding method. In this method, the frictional heat is generated between the ...

AI Technical Summary

Problems solved by technology

The boundary of the friction area is the outer contour of the working end face of the stirring sleeve. The temperature of this boundary is the highest, and the structure of the workpiece is unstable. Since this boundary is the axial movement interface of the stirring sleeve, the plastic flow of the metal also happens at this interface, so that Greatly affects the strength of the solder joint

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