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Method for filling friction stir welding keyhole by using T-shaped filling block and bitless stirring head

A friction stir welding and filling block technology, which is applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of complex tool preparation and operation, limited suitable materials, non-metallurgical interface at the interface, etc. Create simple, smooth-shaped effects

Inactive Publication Date: 2012-06-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of complex tool preparation and operation, limited suitable materials, and non-metallurgical interface in the above-mentioned prior art, and provide a method for filling friction stir welding keyholes with T-shaped filler blocks and needleless stirring heads. method

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  • Method for filling friction stir welding keyhole by using T-shaped filling block and bitless stirring head
  • Method for filling friction stir welding keyhole by using T-shaped filling block and bitless stirring head
  • Method for filling friction stir welding keyhole by using T-shaped filling block and bitless stirring head

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Embodiment Construction

[0042] The present invention is described in further detail below in conjunction with accompanying drawing:

[0043] The process of "the method of filling the friction stir welding keyhole with a T-shaped filler block and a needleless stirring head" proposed by the present invention is as follows:

[0044] (1) First, the upper part of the friction stir welding keyhole is reamed, processed into a tapered shape with a wide top and a narrow bottom, and the inner wall is pre-cleaned so that the filling block can be inserted smoothly. If the keyhole itself after friction stir welding is frustoconical, the hole reaming process can be omitted.

[0045] (2) Based on the inner diameter of the expanded hole, prepare a T-shaped filler block that can partially or directly reach the bottom of the taper-shaped keyhole according to the principle of tight fit, and its material is the same as that of the base material. Wherein, the diameter of the T-shaped dome head of the T-shaped filling bl...

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Abstract

The invention discloses a method for filling a friction stir welding keyhole by using a T-shaped filling block and a bitless stirring head. The method comprises the following steps of: (1) performing chambering on the upper part of the friction stir welding keyhole, machining to form a table conical shape of which the upper side is wide and the lower side is narrow, and precleaning the inner wall of the friction stir welding keyhole; (2) preparing the T-shaped filling block; (3) prearranging the T-shaped filling block in a table conical hole, so that a T-shaped endshield is exposed with a certain height; (4) starting the bitless stirring head to rotate and press, so that the T-shaped filling block is subjected to rotary extrusion towards the keyhole; (5) when the stirring head is pressed to be flush with upper surfaces of workpieces to be subjected to repair welding basically, performing in-situ friction for a certain time; and (6) removing trimmings, so that the filling surface is smooth and beautiful. The method has the advantages that: tools (bitless tools) are easy to design and manufacture, the tools are not needed to be replaced when the keyholes are repaired in batch, the filling material is saved, the keyhole is not thinned or is thinned slightly after being welded, and membranes of the side wall and the bottom are well removed, so that the side wall and the bottom can be combined compactly. The method also can be used for repairing defects of casting surfaces and weld joints.

Description

Technical field: [0001] The invention belongs to the field of welding, and relates to a method for filling and eliminating keyholes in friction stir processing, which can also be used for repairing defects of castings and welding seams. Background technique: [0002] Friction stir welding (FSW) is a new welding technology invented by the Welding Institute (TWI) in 1991. As a new type of solid-phase joining technology, friction stir welding is environmentally friendly, does not require gas shielding and filler metal, does not appear common defects such as thermal cracks and pores in the weld, has the advantages of small deformation, low residual stress and excellent mechanical properties of the joint. . At present, friction stir welding has been successfully applied to the connection between aluminum alloys and certain dissimilar metals that are difficult to weld by traditional fusion welding, and has been widely used in many aluminum alloy structure manufacturing fields suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K35/02
Inventor 张贵锋焦伟民张建勋
Owner XI AN JIAOTONG UNIV
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