Plug pin type titanium alloy panel friction stir spot welding method

A technology of friction stir and titanium alloy, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of "effective keyhole removal, little application research, and immaturity" and achieve convenient atmosphere protection device, Small amount of thinning and easy operation

Inactive Publication Date: 2018-11-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To a certain extent, the above methods can effectively solve the "keyhole" problem of friction stir welding of light metals such as aluminum and magnesium alloys, but these methods are not suitable for stirring materials such as titanium and titanium alloys with high melting point and poor plastic fluidity. Friction welding, especially the keyhole in friction stir spot welding, it is difficult to effectively remove the "keyhole"
Therefore, the current research on the application of FSW technology in stir welding of titanium alloy materials is not mature enough, especially the application research of friction stir spot welding (FSSW) and friction plug spot welding technology in lap welding of titanium alloy plates is still relatively small.

Method used

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  • Plug pin type titanium alloy panel friction stir spot welding method
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  • Plug pin type titanium alloy panel friction stir spot welding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The implementation process of the plug-pin type titanium alloy friction stir spot welding method is as follows:

[0019] (1) Fix and position the titanium alloy plate 4 to be spot welded on the welding machine to ensure that there is no bulging and movement between the upper and lower base metals during the welding process, and move the position of the welding machine table to determine the welding point for spot welding Use a conical drill bit to process a concave conical preset hole 7 on the welding point of the base metal, and use compressed air to blow and clean the preset hole 7 to make the surface free of debris and oil, so as to ensure the surface of the upper plate in the welding area The thickness is H, the upper opening diameter of the concave taper hole is 1H, and the depth is usually 1.9H, usually a concave blind hole;

[0020] (2) Based on the inner diameter and depth of the preset hole 7, prepare and select a matching plug 2 according to the principle of f...

Embodiment 2

[0028] The implementation process of the plug-pin type titanium alloy friction stir spot welding method is as follows:

[0029] (1) Fix and position the titanium alloy plate 4 to be spot welded on the welding machine to ensure that there is no bulging and movement between the upper and lower base metals during the welding process, and move the position of the welding machine table to determine the welding point for spot welding Use a conical drill bit to process a concave conical preset hole 7 on the welding point of the base metal, and use compressed air to blow and clean the preset hole 7 to make the surface free of debris and oil, so as to ensure the surface of the upper plate in the welding area The thickness is H, the upper opening diameter of the concave taper hole is 3H, the depth is usually 3H, and it is usually a concave blind hole;

[0030] (2) Based on the inner diameter and depth of the preset hole 7, prepare and select a matching plug 2 according to the principle ...

Embodiment 3

[0038] The implementation process of the plug-pin type titanium alloy friction stir spot welding method is as follows:

[0039] (1) Fix and position the titanium alloy plate 4 to be spot welded on the welding machine to ensure that there is no bulging and movement between the upper and lower base metals during the welding process, and move the position of the welding machine table to determine the welding point for spot welding Use a conical drill bit to process a concave conical preset hole 7 on the welding point of the base metal, and use compressed air to blow and clean the preset hole 7 to make the surface free of debris and oil, so as to ensure the surface of the upper plate in the welding area The thickness is H, the upper opening diameter of the concave taper hole is 1.5H, and the depth is usually 2.5H, usually a concave blind hole;

[0040] (2) Based on the inner diameter and depth of the preset hole 7, prepare and select a matching plug 2 according to the principle of...

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Abstract

The invention discloses a plug pin type titanium alloy panel friction stir spot welding method which comprises the following steps of (1) processing a preset hole: using an expanding drill for processing a concave conical preset hole in a base metal welding part; (2) welding: loading a conical plug pin into a clamping hole of a stirring head of a welding tool, under the argon shield atmosphere, starting the stirring head to rotate and insert a plug pin into the preset hole, carrying out friction stir welding, and carrying out static-pressure upset forging on a welding area through the stirringhead so as to realize structure densification; and (3) removing the welding tool, clearing, closing the shield gas, unloading the welding tool, removing flanges, and accomplishing welding. Accordingto the plug pin type titanium alloy panel friction stir spot welding method provided by the invention, the welding tool and the plug pin are simple in structure and convenient to process, the consumables are saved, the plug pin is convenient to replace during the welding process, and the continuous spot welding operation in batch can be realized easily; and a post-welding fill area material structure is dense, the mechanical property is excellent, the deformation is less, and the pollution is free.

Description

technical field [0001] The invention belongs to the technical field of metal welding, in particular to a plug-pin type friction stir spot welding method for titanium alloy plates. Background technique [0002] At present, there are many researches and applications of friction stir spot welding (FSSW) technology in the welding of aluminum, magnesium and other light alloy materials. However, since the welding tools of the traditional friction stir welding technology are all one-piece stirring heads with a certain length of stirring needles, a "keyhole" similar in size and shape to the stirring needles will be left at the end of the weld. ". The existence of the keyhole reduces the relative effective width of the weld, reduces the lap shear strength and tensile strength, and reduces the welding quality and the safety of the component. [0003] Based on this, many new friction stir welding methods without keyhole or keyhole elimination have been proposed: For example, in 1999,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23P15/00
CPCB23K20/122B23K20/24B23P15/00
Inventor 李军平沈以赴候文涛黄国强严银飞汤精明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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