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A Friction Stir Welding Method for Suppressing Weld Thinning and Thickening Weld

A friction stir welding and stirring head technology, applied in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of effective thickness reduction, stress concentration, flash, etc., to avoid cracks, high production efficiency, and achieve two secondary reinforcement effect

Active Publication Date: 2021-01-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention aims to propose a friction stir welding method that suppresses weld seam thinning and thickens the weld seam, and utilizes the consumable friction head to eliminate weld seam thinning and realize weld seam thickening, thereby significantly improving The service life of the weld seam solves the problems of flashing, effective thickness thinning and stress concentration caused by the thinning of the weld seam in friction stir welding

Method used

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  • A Friction Stir Welding Method for Suppressing Weld Thinning and Thickening Weld

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Embodiment Construction

[0030] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0032] Such as figure 1 As shown, a friction stir welding method that suppresses weld seam thinning and thickens the weld seam is achieved through the following steps:

[0033] Step 1: Cleaning before welding, first remove the oxide film on the surface of the plate to be welded by mechanical grinding, and then use an organic solvent or cleaning agent to wipe the surface of the plate to be welded to remove oil and metal dust and other sundries. The organic solvent is alcohol or acetone, etc.;

[0034] Step 2: Selection of the material and shape of the stirring head 1 and the consumable friction head 2. The material of the stirring head 1 depends on the properties and thickness of the pla...

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Abstract

The invention provides a friction stir welding method for restraining welded joint thinning and thickening a welded joint. The friction stir welding method includes the steps that firstly, cleaning isconducted before welding, an oxide film on the surface of a sheet to be welded is removed by mechanical polishing, and then organic solvents or cleaning agents are adopted to wipe the surface of thesheet to be welded to remove sundries; secondly, materials and shapes of a stirring head and a consumptive friction head are selected, the material and the shape of the stirring head are determined according to the properties and the thickness of the sheet to be welded, the consumptive friction head is made of the same material as the sheet to be welded, and the diameter of the consumptive friction head is equal to or larger than that of shaft shoulders of the stirring head; thirdly, positioning is conducted, the relative position of the sheet to be welded is adjusted to make the axis of the stirring head and the axis of the consumptive friction head face the center line of a to-be-welded position of the sheet to be welded, and the consumptive friction head is arranged directly behind thestirring head; and fourthly, welding is carried out. The friction stir welding method eliminates welded joint thinning and achieves welded joint thickening, so that the service life of the welded joint is remarkably prolonged.

Description

technical field [0001] The invention belongs to the field of friction stir welding, and in particular relates to a friction stir welding method for suppressing weld seam thinning and thickening the weld seam. Background technique [0002] As a new solid-phase joining technology, friction stir welding has been widely used in aerospace, high-speed rail and ships. However, due to the inherent characteristics of its technology, the problem of joint thinning is unavoidable. The thinning of friction stir welded joints has adverse effects on joint quality and service performance. The thinning of the joint is generally accompanied by the appearance of flash, and the surface of the weld needs to be polished twice, resulting in an increase in production cost and a decrease in production efficiency; the effective bearing area of ​​the weld is reduced, resulting in a decrease in the bearing capacity of the joint; stress is generated at the edge of the weld Concentration, under fatigue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/12B23K20/26
Inventor 孟祥晨黄永宪谢聿铭李峻臣王丽娟
Owner HARBIN INST OF TECH
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