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Method for improving plasticity of underwater stir friction welding joint

A technology of welded joints and friction stir, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problem of plasticity reduction and achieve the effect of increasing plastic deformation capacity and improving plasticity

Inactive Publication Date: 2012-11-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for improving the plasticity of underwater friction stir welded joints to solve the problem of plasticity reduction in aluminum alloy underwater friction stir welded joints that can be heat treated

Method used

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  • Method for improving plasticity of underwater stir friction welding joint

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment is realized by the following steps: Step 1, preparation before welding: the workpiece 5 to be welded is placed on the upper end surface of the stainless steel backing plate 2, and the workpiece 5 to be welded and the stainless steel backing The plate 2 is firmly positioned, and then water is injected into the water tank 1, and the water surface is 30-50mm higher than the upper end surface of the workpiece to be welded; Step 2, workpiece welding: friction stir welding is carried out with the welding tool 7 along the butt joint surface of the workpiece 5 to be welded , the welding parameters are 400 rpm to 2000 rpm, and the welding speed is 50 mm / min to 1000 mm / min to form a connection weld A; Step 3, a modification treatment: return the welding tool 7 to the connection weld The initial position O of A, and then offset to the side of the connecting weld A, the first offset t1 is e...

specific Embodiment approach 2

[0008] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the material of the workpiece 5 to be welded in Step 1 and Step 2 of this embodiment is aluminum, aluminum alloy, magnesium or magnesium alloy. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0009] Specific implementation mode three: combination figure 1 To illustrate this embodiment, in Step 1 of this embodiment, the water surface is 30mm higher than the upper end surface of the workpiece to be welded. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses a method for improving the plasticity of an underwater stir friction welding joint and relates to a stir friction welding and modified treatment method for solving the problem that the plasticity of a heat-treatable strengthened aluminum alloy underwater stir friction welding joint is reduced. The method comprises the following steps of: 1, firmly positioning a welded workpiece and a stainless steel base plate by using a clamp, wherein the water surface in a water tank is 30mm higher than an upper end face of the welded workpiece; 2, performing stir friction welding byusing a welding set along an butted surface of the welded workpiece to form a connecting welding line, wherein the welding parameters are the rotating speed of 800 revolutions per minute and the welding speed of 100mm per minute; and 3, retracting the welding set to an initial position of the connecting welding line, shifting to one side of the connecting welding line, wherein the one-time offsetis equal to the width of the connecting welding line, performing one-time modified treatment from the initial position after one-time offset so as to obtain an modified welding line, wherein the direction for performing the one-time modified treatment is the same as the welding direction of the connecting welding line, and the rotating speed and the welding speed of the welding set are the same as those in the step 2. The method for improving the plasticity of the underwater stir friction welding joint is used for stir friction welding.

Description

technical field [0001] The invention relates to a friction stir welding and modification treatment method. Background technique [0002] In the friction stir welding process of heat treatable aluminum alloy, due to the influence of welding heat cycle, a zone with a hardness value lower than that of the base metal is formed inside the joint, that is, the softening zone. The formation of the softened zone significantly reduces the mechanical properties of the joint. The existing research results show that the underwater friction stir welding method can effectively increase the tensile strength of the joint by utilizing the strong heat absorption effect of the water medium, but at the same time reduce the plasticity of the joint. To solve this problem, the present invention proposes a method for improving the plasticity of underwater friction stir welded joints. Contents of the invention [0003] The purpose of the present invention is to provide a method for improving the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/24
Inventor 刘会杰张会杰赵运强于雷黄永宪张超群
Owner HARBIN INST OF TECH