Keyhole-free friction stir spot welding method for dissimilar materials

A technology of friction stirring and dissimilar materials, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as complex relative motion, complex stirring head, difficult welding, etc., and achieve low weld residual stress and workpiece deformation Small, Adaptable Effects

Inactive Publication Date: 2010-08-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has a complicated mixing head, but also needs to complete complex relative motions, which requires strict rigidity and control accuracy of the equipment, requires special welding equip

Method used

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  • Keyhole-free friction stir spot welding method for dissimilar materials
  • Keyhole-free friction stir spot welding method for dissimilar materials
  • Keyhole-free friction stir spot welding method for dissimilar materials

Examples

Experimental program
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Effect test

Example Embodiment

[0007] Specific implementation mode 1: Combination Figure 1~3 To explain this embodiment, this embodiment is achieved through the following steps: Step 1. Put the two materials together, place the material with high melting point or low thickness on top, and place the material with low melting point or thicker thickness below , The two materials are fixed and compressed; step two, spot welding: use the existing integrated welding tool to perform friction stir spot welding at the position to be welded on the upper surface of the material, the selection of the parameters of the integrated welding tool: the integrated welding tool The length of the stirring pin is 3mm~9mm, the shoulder diameter of the integrated welding tool is 10mm~28mm, the rotation speed of the integrated welding tool is 400 revolutions / minute ~ 1000 revolutions / minute, and the shoulder of the integrated welding tool is pressed in The amount is 0.1mm~0.3mm. During spot welding, the welding tool will gradually ...

Example Embodiment

[0008] Specific implementation manner two: combination figure 1 To describe this embodiment, the material of the integrated welding tool in step 2 of this embodiment is quenched heat-treated high-speed steel. The above materials can be reused. The other steps are the same as in the first embodiment.

Example Embodiment

[0009] Specific implementation mode three: combination figure 1 To describe this embodiment, the material of the shoulder 2 on the combined welding tool in step 3 of this embodiment is quenched and heat-treated high-speed steel. The above materials can be reused. The other steps are the same as the first or second embodiment.

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Abstract

The invention provides a keyhole-free friction stir spot welding method for dissimilar materials, which relates to a spot welding method. The invention aims to eliminate keyholes on weld surfaces of friction stir spot welding of two kinds of materials with larger attribute difference. The method comprises the following steps: (1) superposing two kinds of materials, and putting the material with high a melting point or small thickness above the material with a low melting point or large thickness; (2) using the current integrated welding tool for carrying out friction stir spot welding in the position to be welded on the surface of the upper material, after the welding tool stops drilling, continuing to rotate for 3 seconds, lifting the integrated welding tool, and forming keyholes at the central parts of spot welds; and (3) using a combined welding tool for carrying out repair welding for the keyholes in the step (2), gradually drilling the welding tool into the keyholes, after the welding tool stops drilling, continuing to rotate for 4 seconds, lifting the combined welding tool, and forming spot welds at the parts of the keyholes, thereby realizing the keyhole-free friction stir spot welding method for dissimilar materials. The invention is used for keyhole-free friction stir spot welding for dissimilar materials and repair welding for keyholes of conventional friction stir spot welds.

Description

Technical field [0001] The invention relates to a spot welding method, in particular to a friction stir spot welding method of dissimilar materials. Background technique [0002] Dissimilar materials refer to materials with large differences in properties, such as copper alloys and aluminum alloys, titanium alloys and aluminum alloys, and steel and aluminum alloys. Conventional friction stir spot welding is to form a connected point joint under the action of frictional heat and plastic deformation energy. The process is that a non-consumable mixing head rotates at high speed, inserting into the connected workpiece by applying upsetting pressure, the friction between the mixing head and the workpiece causes the metal to soften and plastic flow, maintain the pressure of the mixing head and make the shaft shoulder contact the surface of the workpiece , Continue to rotate for a certain period of time, after the connection is completed, the mixing head exits from the workpiece, leavi...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/26
Inventor 黄永宪刘会杰李金全田英韩冰
Owner HARBIN INST OF TECH
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