Friction stir butt welding device for high-resistivity alloy and processing method

Abstract

The invention relates to a friction stir butt welding device for a high-resistivity alloy and a processing method. The friction stir butt welding device comprises a worktable and a friction stir welding mechanism, the worktable is used for placing and fixing to-be-welded workpieces, the to-be-welded workpieces comprise a first workpiece and a second workpiece which are flatly laid on the surface of the worktable in parallel, a butted interface is formed at the mutual-contact position, the friction stir welding mechanism comprises friction stir welding equipment arranged above the worktable, astirring head of the friction stir welding equipment is located over the butted interface of the to-be-welded workpieces, the bottom of the butted interface is further provided with a copper plate electrode, and the device further comprises a rolling electrode assembly. By arranging a copper core electrode, the copper plate electrode and a second power supply, a large direct current is applied tothe butted interface of the workpieces, the workpieces are softened by joule heat generated by the large direct current, meanwhile plasticity and liquidity of the workpieces are improved, and the purposes of prolonging the life of the stirring head and increasing the welding speed are achieved.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and in particular relates to a friction stir butt welding device for high-resistivity alloys and a processing method thereof. Background technique [0002] Composite friction stir welding uses an auxiliary heat source to provide additional heat input for friction stir welding, thereby improving the application range and adaptability of friction stir welding. In recent years, researchers have successively developed laser, current, arc, induction, ultrasonic and other energy-assisted friction stir welding. Among them, current-assisted friction stir welding is an external heat-assisted friction stir welding technology invented by using high-intensity current to cause material softening. It is a current output device added to the traditional process of friction stir welding. High-intensity current passes through the stirring needle and the weldment at its lower end. The Joule heat gene...

AI Technical Summary

Problems solved by technology

[0005] Current-assisted friction stir welding speeds up the softening of materials by generating Joule heat and changing the electroplasticity of materials by applying an external current. However, the welding objects of friction stir welding are mostly metals with low resistivity. High-intensity electric current is required to produce the effect

High-intensity current will also bring about high energy consumption, which also hinders the large-scale application of current-assisted friction stir welding.

Images