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

A friction stir welding and friction stir technology, used in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve the problems of difficult welding of high melting point metals, harsh process conditions, high preparation costs, etc., to reduce welding costs and strengthen joints. The effect of performance and low cost of use

Inactive Publication Date: 2009-09-23
CHONGQING UNIV
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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 compl

Method used

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

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Effect test

example 1

[0073] Example 1: Using this method and equipment to process pure copper materials, the process parameters are as follows: stirring head rotation speed 300-1500rmp, electromagnetic vibration frequency 120-250Hz, electromagnetic vibration amplitude 1-2mm, stirring speed 0.1-1.2m / min , liquid nitrogen 10-30L / min.

example 2

[0074]Example 2: Using this method of electromagnetic vibration combined with electromagnetic action friction stir welding of 1.6mm thick 304L stainless steel, the process parameters are as follows: stirring head rotation speed 800-2000rmp, electromagnetic vibration frequency 180-250Hz, electromagnetic vibration amplitude 0.2-1mm, The welding speed is 0.1-1.2m / min, and the flow rate of cold nitrogen protection is 20-50L / min.

[0075] The reasonable matching of electromagnetic vibration process parameters, electromagnetic field process parameters and friction stir welding process parameters should be considered comprehensively, so that electromagnetic vibration, electromagnetic field, shielding gas, weld temperature control and other means can be organically combined, and the main The process parameters are systematically optimized, which guarantees high-quality welded joints or high-quality functional layers.

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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 ...

Claims

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Application Information

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IPC IPC(8): B23K20/00B23K20/12B23K20/10B23K20/26B23K20/14F16J15/32C21D7/13C22F1/00B23K20/22F16J15/3204
Inventor 罗键王颖
Owner CHONGQING UNIV
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