scholarly journals Analysis of welded joints using friction stir welding, metal inert gas and tungsten inert gas

2016 ◽  
Vol 7 (1) ◽  
pp. 1-7 ◽  
Author(s):  
A.M. KHOURSHID ◽  
IBRAHEEM SABRY
Keyword(s):  
Friction Stir Welding ◽  
Welded Joints ◽  
Inert Gas ◽  
Friction Stir ◽  
Welding Metal ◽  
And Tungsten

Intergranular corrosion susceptibility of 6061 aluminum alloy welded joints

2021 ◽  
Vol 112 (8) ◽  
pp. 610-616
Author(s):  
Lihua Gong ◽  
Weimin Guo ◽  
Yang Li
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Welded Joints ◽  
Intergranular Corrosion ◽  
Inert Gas ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
Melted Zone ◽  
Metal Inert Gas Welding ◽  
Welding Joints

Abstract The intergranular corrosion behavior of 6061 aluminum alloy welded joints produced by metal inert gas welding and friction stir welding was studied. The microstructure of the welded joints and the intergranular corrosion morphology of the cross-section were analyzed by optical microscopy. The results show that the most sensitive area of intergranular corrosion is the partially melted zone of the metal inert gas welding, and the maximum corrosion depth is about seven times that of the base metal, followed by the unmixed zone. The heat affected zone has the lowest sensitivity. Although the welding seam corroded seriously, general corrosion played a leading role. With the high heat input of metal inert gas welding, the sensitivity to intergranular corrosion in the partially melted zone increased significantly, while other zones had little change. For friction stir welding joints, the heat affected zone suffered from the most severe corrosion, and the nugget zone the least. However, the difference is not apparent. The susceptibility to intergranular corrosion of friction stir welding joints is weaker than that of metal inert gas welding joints but more severe than the base metal.

Comparison of Friction Stir and Tungsten Inert Gas Weldments of AA6061-T6

2013 ◽  
Vol 858 ◽  
pp. 19-23
Author(s):  
Mohd Rafiza Shaari ◽  
Zuhailawati Hussain ◽  
Indra Putra Almanar ◽  
Nguyen Van Thuong
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Fusion Zone ◽  
Aluminium Alloys ◽  
Inert Gas ◽  
Nugget Zone ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties ◽  
And Tungsten

In this research, 6061-T6 aluminum alloys were welded using friction stir welding and tungsten inert as techniques in order to investigate the microstructure and mechanical properties. FSW of aluminium alloys has showed better mechanical properties compared to the conventional welding, tungsten inert gas (TIG). FSW weldment did not show any pores at the nugget zone compared to fusion zone in TIG weldment which produced a lot of pores.

Strength of welded joints of heat-hardenable aluminium alloys in TIG and friction stir welding

2019 ◽  
Vol 2019 (2) ◽  
pp. 13-18 ◽  
Author(s):  
A.G. Poklyatsky ◽  
◽  
S.I. Motrunich ◽  
Keyword(s):  
Friction Stir Welding ◽  
Welded Joints ◽  
Aluminium Alloys ◽  
Friction Stir

Features of structure formation processes in AA2024 alloy joints formed by the friction stir welding with bobbin tool

2021 ◽  
Vol 23 (2) ◽  
pp. 98-115
Author(s):  
Alexey Ivanov ◽  
◽  
Valery Rubtsov ◽  
Andrey Chumaevskii ◽  
Kseniya Osipovich ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Structure Formation ◽  
Welded Joints ◽  
Heat Input ◽  
Welded Joint ◽  
Welding Process ◽  
Tool Material ◽  
Travel Speed ◽  
Material System ◽  
Friction Stir

Introduction. One of friction stir welding types is the bobbin friction stir welding (BFSW) process, which allows to obtain welded joints in various configurations without using a substrate and axial embedding force, as well as to reduce heat loss and temperature gradient across the welded material thickness. This makes the BFSW process effective for welding aluminum alloys, which properties are determined by their structural-phase state. According to research data, the temperature and strain rate of the welded material have some value intervals in which strong defect-free joints are formed. At the same time, much less attention has been paid to the mechanisms of structure formation in the BFSW process. Therefore, to solve the problem of obtaining defect-free and strong welded joints by BFSW, an extended understanding of the basic mechanisms of structure formation in the welding process is required. The aim of this work is to research the mechanisms of structure formation in welded joint of AA2024 alloy obtained by bobbin tool friction stir welding with variation of the welding speed. Results and discussion. Weld formation conditions during BFSW process are determined by heat input into a welded material, its fragmentation and plastic flow around the welding tool, which depend on the ratio of tool rotation speed and tool travel speed. Mechanisms of joint formation are based on a combination of equally important processes of adhesive interaction in “tool-material” system and extrusion of metal into the region behind the welding tool. Combined with heat dissipation conditions and the configuration of the “tool-material” system, this leads to material extrusion from a welded joint and its decompaction. This results in formation of extended defects. Increasing in tool travel speed reduce the specific heat input, but in case of extended joints welding an amount of heat released in joint increases because of specific heat removal conditions. As a result, the conditions of adhesion interaction and extrusion processes change, which leads either to the growth of existing defects or to the formation of new ones. Taking into account the complexity of mechanisms of structure formation in joint obtained by BFSW, an obtaining of defect-free joints implies a necessary usage of various nondestructive testing methods in combination with an adaptive control of technological parameters directly in course of a welding process.

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