Complete Status Report Documenting Development of Friction Stir Welding for Joining Thin Wall Tubing of ODS Alloys

2017 ◽  
Author(s):  
David T. Hoelzer ◽  
Jeffrey R. Bunn ◽  
Maxim N. Gussev
Keyword(s):  
Friction Stir Welding ◽  
Status Report ◽  
Thin Wall ◽  
Friction Stir ◽  
Ods Alloys

Trace generation of friction stir welding robot for space weld joint on large thin-walled parts

2016 ◽  
Vol 43 (6) ◽  
pp. 617-627 ◽  
Author(s):  
Ruolong Qi ◽  
Weijia Zhou ◽  
Huijie Zhang ◽  
Wei Zhang ◽  
Guangxin Yang
Keyword(s):  
Friction Stir Welding ◽  
Weld Joint ◽  
Plane Curve ◽  
Complex Surface ◽  
Space Curve ◽  
Least Square ◽  
Thin Wall ◽  
Content Type ◽  
Friction Stir ◽  
Thin Walled

Purpose The weld joint of large thin-wall metal parts which deforms in manufacturing and clamping processes is very difficult to manufacture for its shape is different from the initial model; thus, the space normals of the part surface are uncertain. Design/methodology/approach In this paper, an effective method is presented to calculate cutter location points and to estimate the space normals by measuring some sparse discrete points of weld joint. First, a contact-type probe fixed in the end of friction stir welding (FSW) robot is used to measure a series of discrete points on the weld joint. Then, a space curve can be got by fitting the series of points with a quintic spline. Second, a least square plane (LSP) of the measured points is obtained by the least square method. Then, normal vectors of the plane curve, which is the projection of the space curve on the LSP, are used to estimate the space normals of the weld joint curve. After path planning, a post-processing method combing with FSW craft is elaborated. Findings Simulation and real experiment demonstrate that the proposed strategy, which obtains cutter locations of welding and normals without measuring the entire surface, is feasible and effective for the FSW of large thin-walled complex surface parts. Originality/value This paper presents a novel method which makes it possible to accurately weld the large thin-wall complex surface part by the FSW robot. The proposed method might be applied to any multi-axes FSW robot similar to the robot studied in this paper.

Methods of overlapping closed joints in friction stir welding of thin wall structures made of aluminium alloys

2016 ◽  
Vol 30 (10) ◽  
pp. 797-801 ◽  
Author(s):  
O. V. Velichko ◽  
S. Yu Ivanov ◽  
V. A. Karkhin ◽  
P. N. Khomich ◽  
V. A. Lopota ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloys ◽  
Thin Wall ◽  
Friction Stir ◽  
Wall Structures

scholarly journals Microstructure and Properties of 2219 Aluminum Alloy under Compound Technologies of Friction-Stir-Welding, Heat-Treatment and Electromagnetic Forming

2018 ◽  
Author(s):  
Zeyu Wang ◽  
Liang Huang ◽  
Jianjun Li ◽  
Xiaoxia Li ◽  
Hui Zhu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Large Scale ◽  
Electromagnetic Forming ◽  
Forming Limit ◽  
Thin Wall ◽  
Processing Technologies ◽  
Friction Stir ◽  
2219 Aluminum Alloy

Among all the processing technologies of heat-treatable aluminum alloys like 2219 aluminum alloy, using friction stir welding (FSW) as the joining technology and using electromagnetic forming (EMF) for plastic forming technology both have obvious advantages and successful applications. Therefore, there is a broad prospect for the compound technologies which can be used on the 2219 aluminum alloy to manufacture the large-scale thin-wall parts in the astronautic industry. The microstructure and mechanical properties of 2219 aluminum alloy under the process compounded of FSW, heat treatment, and EMF were investigated by means of tensile test, optical microscope (OM), and scanning electron microscope (SEM). The results show that the reduction of strength, which was caused during the FSW process, can be recovered effectively by the post-welding heat treatment composed of solid solution and aging, while the ductility was still reduced after heat treatment. Under the compound technology of FSW, heat treatment, and EMF, the forming limit of 2219 aluminum alloy decreased distinctly due to the poor ductility of the welding joint. A ribbon-pattern, which was formed due to the banded structure caused by FSW process, was found on the fracture surface of welded 2219 aluminum alloy after EMF treatment. During the EMF process, because of the effects of induced eddy current, a unique structure, which was manifested as a molted-surface appearance under the SEM observation, was formed as the material fractured.

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

2020 ◽  
Vol 17 (3) ◽  
pp. 8150-8159
Author(s):  
Kulwant Singh ◽  
Gurbhinder Singh ◽  
Harmeet Singh
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Mechanical Performance ◽  
Fuel Efficiency ◽  
Research Work ◽  
Grain Structure ◽  
Tensile Fracture ◽  
Friction Stir ◽  
The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

Friction stir welding

2010 ◽  
Author(s):  
Daniela Lohwasser ◽  
Zhan Chen
Keyword(s):  
Friction Stir Welding ◽  
Friction Stir
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