Back-penetrated and ultrasonic tool head supported friction stir welding device

Abstract

The invention relates to a back-penetrated and ultrasonic tool head supported friction stir welding device. The device comprises a friction stir welding machine with a long needle stirring head, an ultrasonic tool head with a hole groove and a support platform, an amplitude change rod, a transducer and an ultrasonic generator. The ultrasonic tool head with the hole groove and the support platformis directly contacted with areas to be welded at the back parts of workpieces; the tool head provides a support effect, and directly applies ultrasonic energy into a plastic shearing layer around a stirring needle; and an ultrasonic softening effect is used for reducing the material plastic deformation resistance, improving the fluidity and influencing the material deformation behaviors to preventholes in joints. The long needle stirring head matched with the hole groove is adopted to penetrate through the back parts of the workpieces to thoroughly prevent non-welding defects of root parts. Through the mode, the ultrasonic energy utilization rate is increased, the plastic deformation and the fluidity of materials at the root parts of welding lines are improved, the formation of the root parts of the welding lines is improved, the gains of the welding lines are refined, and the mechanical performances and the critical welding speed of the joints and the production efficiency are improved.

Description

technical field [0001] The invention belongs to the field of friction stir welding, and in particular relates to a back penetration and ultrasonic tool head support-assisted friction stir welding device. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Friction stir welding is a new type of solid phase joining technology, which has the advantages of high joint quality, small welding deformation, green welding process, etc. It is widely used in the field of joining aluminum alloys, magnesium alloys and other materials. Friction stir welding mainly relies on the frictional heat between the stirring head and the workpiece and the plastic deformation heat of the material to so...

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Problems solved by technology

[0005] In order to overcome the above problems, improve the utilization rate of ultrasonic energy and the effect of ultrasound on the root of the weld, and at the same time completely eliminate the possible unwelded defects at the root of the weld, the present invention provides a back penetrating and ultrasonic tool head supporting auxiliary The advanced friction stir welding device enables the stirring needle to penetrate the workpiece, and at the same time, the ultrasonic wave is directly applied from the back of the workpiece to the plastic shear layer around the stirring needle at the root of the weld, and the ultrasonic vibration energy is used to reduce the plastic deformation resistance of the material and improve its plasticity Fluidity, so as to solve the problem that the friction stir weld is easy to produce holes and unwelded under the condition of mismatching process parameters or high welding speed, so as to improve the critical friction stir welding speed and welding efficiency, and reduce the welding load at the same time

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