Welding method for reducing overlapping joint defects of friction stir welding

A welding method and friction stir technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems affecting the performance and quality of joints

Active Publication Date: 2018-04-06
SHENYANG AEROSPACE UNIVERSITY
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  • Claims
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Problems solved by technology

[0005] In order to solve the problem that the hook defects and cold lap defects in the welding of friction stir lap joints in the prior art seriously a...

Method used

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  • Welding method for reducing overlapping joint defects of friction stir welding
  • Welding method for reducing overlapping joint defects of friction stir welding
  • Welding method for reducing overlapping joint defects of friction stir welding

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Embodiment 1

[0039] The aluminum alloy flat plate welded sheet 1 with H1=4mm and the aluminum alloy step welded sheet 2 with H2=6mm are assembled for the butt joint structure. The height of the butt joint surface is the same as that of H1, that is, 4mm. The surface length L1 is selected as 15mm, and then the friction stir welding is carried out using the welding method of the present invention: the stirring needle length L3=5.4mm, the pressing amount=0.2mm, the stirring needle root diameter D3=6mm, the end diameter D4=4mm, The diameter of the stirring needle at the junction of the bonding surface is D2=4.6mm, the shoulder diameter D1=18mm, the rotation speed is 800r / min, the welding speed is 200mm / min, and the distance between the agitating needle offset and the center of the bonding surface is 0.5×4.6mm =2.3mm. Microstructure analysis showed that there were no hook-shaped defects on the forward side of the joint, especially in the stirring zone on the backward side, no cold lap defects (su...

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Abstract

The invention provides a welding method for reducing overlapping joint defects of friction stir welding, and belongs to the technical field of friction stir welding. The welding method comprises the following steps of (1) measuring geometric parameters of a to-be-welded workpiece and a mixing head; (2) fixing the to-be-welded workpiece; (3) determining a welding position; and (4) performing friction stir welding. The welding method is used for performing the friction stir welding on an overlapping structure. According to the method, the overlapping abutted surface of the overlapping structureis used as the retreating side of the friction stir welding, and the other side is used as the advancing side. A conical mixing needle is offset on the advancing side, and a high welding heat input mode is matched, so that an oxidation film on the overlapping abutted surface of the overlapping structure is prevented from entering a mixing area, on the premise that hooked defects are prevented fromforming on the advancing side, cold overlapping defects generated in the mixing area of the retreating side are reduced, and the purpose of increasing the quality of the welded joint is achieved.

Description

Technical field [0001] The invention relates to the field of friction stir welding, in particular to a welding method for reducing the defects of friction stir welding to lap joints. Background technique [0002] Friction Stir Welding (Friction Stir Welding, referred to as FSW) technology, as a solid-phase joining technology, can effectively avoid welding defects such as pores and inclusions caused by metallurgical problems during the welding process. However, when friction stir welding is applied to the welding of lap joint structures, due to the plastic flow of the weld metal, hook-shaped defects will appear on both sides of the joint stirring zone, especially on the back side, cold lap extending into the stirring zone will occur. Joint defects (thermal processing technology Vol.46,No.3(2017)p189-194; J Mater Process Technol,Vol.238(2016)p244-254), which seriously endanger the quality of joints, are urgently needed in friction stir lap welding solved problem. [0003] Butt lap ...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/123B23K20/1265
Inventor 徐荣正李慧侯艳喜国旭明张占伟
Owner SHENYANG AEROSPACE UNIVERSITY
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