Pin tool for friction stir welding and ultrafine grain preparation method thereof

Abstract

The invention discloses a pin tool used for friction stir welding, which integrates an electromagnetic vibration system, an electromagnetic action system, an internal forced cooling system, a gas-shielded forced cooling system, a temperature induction system and a sealing and insulation system, and is an integrated pin tool used for friction stir welding, which has the functions of electromagnetic vibration in-situ composite electromagnetic action, forced temperature control, gas shielding and temperature detection, and a device thereof is further disclosed, and can be applied in electromagnetic vibration in-situ composite electromagnetic action friction stir welding and the preparation of ultrafine grain materials with large thickness and large area by severe plastic deformation.

Description

technical field [0001] The invention relates to the fields of welding technology and surface engineering, in particular to a friction stir welding method of friction stir welding with a stirring head and electromagnetic vibration in-situ compound electromagnetic field action, and an ultrafine crystal preparation method and equipment. Background technique [0002] In 1991, W.M.Thomas of the British Welding Institute (TWI) invented the friction stir welding technology and obtained a patent authorization in China (ZL95192193.2). The obvious superiority makes it one of the welding technologies that have been rapidly developed and widely used in engineering in the world in the past two decades. The industrial application of friction stir welding is mainly concentrated in the field of aluminum alloys. With the continuous expansion of its application fields, connecting objects and materials, friction stir welding technology has been successfully expanded in non-ferrous metals with ...

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the preparation of metal ultrafine-grained materials by the existing friction stir technology and severe plastic deformation method, the purpose of the present invention is to provide a high-efficiency, low-cost, high-stability, high-quality stirring head for friction stir welding and a A new type of friction stir welding method, a method and equipment for preparing large-thickness and large-area nanomaterials through severe plastic deformation, in order to break through the limitations of conventional friction stir welding technology and surface engineering technology, and the high cost of material preparation for the stirring head, harsh The process conditions and short service life are restrained to solve the dependence of the high-melting point metal friction stir welding stirring head on high-quality materials and complex preparation technology, and enrich the quality control methods of low melting point light alloy friction stir welding to achieve friction stir welding The effective and reasonable matching of high welding quality and low cost solves the technical problems of conventional friction stir welding, such as high cost, low service life, and difficulty in welding high melting point metals, and the preparation of large thickness and large area by friction stir and severe plastic deformation on the surface of high melting point metals To solve the problem of ultra-fine grain or nano-materials, improve the friction stir welding technology, so as to open up new engineering applications in the field of solid-phase welding and surface engineering, and provide a new technology for the preparation of nano-materials with severe plastic deformation using mature mechanical processing technology

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