Ultrasonic vibration aided stir friction welding process and device

Abstract

The invention relates to an ultrasonic vibration aided stir friction welding process and a device. Power frequency alternating current is transformed into ultrasonic high frequency alternating current signals through an ultrasonic generator. Electric energy is transformed into ultrasonic mechanical vibration energy through a transducer. After the amplitude is further amplified through a variable amplitude bar, ultrasonic waves are conducted into materials through a toolhead from the welding areas around a stirring head for welding through the stirring head in a welding direction. Compared with the method that the variable amplitude bar of an ultrasonic transducer is coupled with the stirring head, after a system is integrated by utilizing a self designed positioning clamping appliance, the stability of a vibration system is efficiently guaranteed, two-dimensional adjustment in upper, lower, front and back directions is realized, and the distance between the toolhead and the stirring head is easily adjusted, so that the ultrasonic vibration aided stir friction welding process and the device are suitable for stirring heads with different specifications and have the advantage of wide adaptability.

Description

technical field [0001] The invention relates to a material connection method, in particular to an ultrasonic vibration-assisted friction stir welding process and device. Background technique [0002] Friction stir welding (FSW for short) is a solid-phase joining technology invented by the British Welding Institute in 1991. It has the advantages of small welding deformation, high welding quality, green and pollution-free, and is called "the most revolutionary in the 21st century. Sexual connection technology". However, due to the huge axial downward pressure and horizontal shear force on the stirring head during the welding process, its welding speed is limited, and the stirring head is severely worn, which also puts forward high requirements for friction stir welding equipment and fixtures. Scholars at home and abroad improve the welding environment by using additional auxiliary heat sources such as mobile induction coils, resistance heating, laser energy or plasma arcs, bu...

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Problems solved by technology

However, with this design, the downward pressure during welding seriously hinders the ultrasonic vibration of the stirring needle, and the equipment of the original friction stir welding machine has been greatly changed, the system is complicated to manufacture, and the ultrasonic vibration system must reach a resonance state with the stirring needle, so for For workpieces with different thicknesses, the matching ultrasonic vibration system needs to be replaced when the stirring needle is replaced, which has poor adaptability

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