A method for eliminating defects in friction stir welding of lead-out plates

A technology of friction stirring and lead-out plate, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as weld end defects, and achieve the effect of eliminating interface crack defects

Active Publication Date: 2022-02-08
安徽万宇机械设备科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Using the method of eliminating the keyhole of the lead-out plate, defects will be generated at the connection interface between the base metal and the lead-out plate perpendicular to the direction of the weld due to the migration of the interface, and during the process of removing the lead-out plate by machining, the crack defects at the lead-out interface will make Weld ends produce certain defects

Method used

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  • A method for eliminating defects in friction stir welding of lead-out plates
  • A method for eliminating defects in friction stir welding of lead-out plates

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specific Embodiment approach 1

[0028] Combine below Figure 1-2 To illustrate this embodiment, the present invention relates to the field of friction stir welding, more specifically, a method for eliminating defects in friction stir welding of lead plates, comprising the following steps:

[0029] Step 1: Select a material of the same quality as the welding plate as the lead-out plate, and process the surface connecting the lead-out plate and the test piece by mechanical processing, remove the oxide layer at the connection interface, and ensure that the connections are in contact with each other;

[0030] Machining the connection interface between the lead plate and the base metal, removing the oxide layer on the surface of the base metal, so that the interface is closely matched;

[0031] Step 2: Fix the lead-out plate and the test piece to be welded on the workbench through the fixture, so as to ensure the accuracy between the lead-out plate and the test piece to be processed; wherein the lead-out plate is...

specific Embodiment approach 2

[0039] Combine below Figure 1-2 To illustrate this embodiment, the length of the second weld seam is 5 mm, so as to avoid excessive heat input from affecting the quality of the joint. The method of fusion welding is used to connect the two ends of the lead-out plate with the specimen to be processed to prevent the quality of the connection from deteriorating due to deformation during welding.

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Abstract

The invention relates to the field of friction stir welding, in particular to a method for eliminating defects in friction stir welding of lead plates. Choose a material of the same quality as the welded plate as the lead-out plate; the weld is connected, and at the initial stage of welding, after the stirring head is tied down, it stays for a period of time, thereby increasing the plastic flow capacity of the material and facilitating the joint forming; when the stirring head When reaching the lead-out plate interface, the butt joint surface of the test piece has been connected. At this time, there will be crack defects at the interface, and the receding side defects will appear in the processed test piece; adjust the welding direction so that the stirring head follows the lead-out plate and the base metal. The interface is welded, and the welding is carried out in the direction of the retreating side to eliminate interface defects; due to a certain inclination of the main axis during welding, during the welding process along the interface between the lead-out plate and the base metal, the end of the second weld and the third weld There will be no defects at the start of the seam. Ultimately, defect-free welding of the connection interface between the lead plate and the base metal is achieved.

Description

technical field [0001] The invention relates to the field of friction stir welding, in particular to a method for eliminating defects in friction stir welding of lead plates. Background technique [0002] As a solid-phase joining technology, friction stir welding has the characteristics of low welding temperature, small joint deformation and green and pollution-free welding process. It has been widely used in aerospace, rail transit and shipbuilding and other manufacturing fields. Friction stir welding realizes the connection through the stirring and friction of the stirring head on the material. However, at the end of the weld, the withdrawal of the stirring pin will leave a keyhole defect at the end of the weld. The existence of the keyhole will seriously reduce the bearing capacity of the joint, and it is prone to fracture under alternating loads. At present, scholars have proposed various ways to avoid the keyhole. At present, more methods are used to repair the keyhol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/26B23K20/12
CPCB23K20/26B23K20/122
Inventor 万龙刘景麟黄体方黄永宪
Owner 安徽万宇机械设备科技有限公司
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