Comparison of FSW and TIG welded joints in Al-Mg-Mn-Sc-Zr alloy plates

Zhen-bo, HE; Peng, Yiming; Yin, Zhi-min; Lei, Xuefeng

doi:10.1016/s1003-6326(11)60915-1

Cited by 56 publications

(25 citation statements)

References 22 publications

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“…7(c)), and their horseshoe-shaped appearance indicates these particles are coherent with Al matrix. According to previous reports [16,18], these nanoscale particles are proved to be Al 3 (Sc 1À x ,Zr x ) particles. However, coarse recrystallization grains and some spherical particles can be observed in the HAZ of Al-Mg-Er welded joint (Fig.…”

Section: Base Metalmentioning

confidence: 61%

“…Al 3 (Sc 1 À x ,Zr x ) particles can inhibit recrystallization by strongly pinning dislocation and subgrain boundaries [7,16,17], so that the base metal of Al-Mg-Sc alloy can still maintain fibrous microstructure ( Fig. 4(a)) after cold rolling and annealing at 300 1C for one hour.…”

Section: Microstructures and Mechanical Properties Of Base Metal Of Amentioning

confidence: 99%

“…These precipitates have significant impact on grain refining, eliminating hot cracking and strengthening of the fusion zone (FZ). They can also inhibit recrystallization in the HAZ by pinning dislocations and subgrain boundaries [13][14][15][16][17]. All these effects of Al 3 (Sc 1 À x ,Zr x ) or Al 3 (Er 1 À x ,Zr x ) particles contribute to improving the mechanical properties of GTAW joint.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and mechanical properties of Gas Tungsten Arc Welded joints of new Al–Mg–Sc and Al–Mg–Er alloy plates

Peng

Huang

et al. 2015

Materials Science and Engineering: A

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Section: Base Metalmentioning

confidence: 61%

Section: Microstructures and Mechanical Properties Of Base Metal Of Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructures and mechanical properties of Gas Tungsten Arc Welded joints of new Al–Mg–Sc and Al–Mg–Er alloy plates

Peng

Huang

et al. 2015

Materials Science and Engineering: A

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“…7a, 7b and 7c shows the microstructure of base metal, fusion zone of specimen G (as welded) and GH (PWHT) welded by GTAW. The base metal contains coarse and elongated grains with uniformly distributed very fine strengthening precipitates.The fusion zone of TIG welded joint contain dendritic structure and this may be due to fast heating of base metal and fast cooling of molten metal due to welding heat [5]. The higher strength of the base material is mainly attributed due to presence of alloying elements such as silicon and magnesium.…”

Section: B Charpy Impact Testmentioning

confidence: 99%

Effect of Post Weld Heat Treatment on Properties of ACTIG Welded Aa6063 Aluminium Alloy Joint

Verma¹

2017

IJRASET

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AA6063 aluminium alloy joints were fabricated by alternating current tungsten inert gas (ACTIG) welding process and the effects of post weld heat treatment (PWHT) on the tensile properties, impact strength, microstructure, microhardness and fractography of the welded joints were investigated. The ACTIG welding process was adopted because it bears higher strength, more ductility and no apparent microstructure defect. The welded samples were divided into as-welded (AW) sample and PWHT sample. The PWHT method used on the samples was solution treatment (535 °C, 2h), water quenching and artificial aging (165 °C, 18h). The experimental results show that, compared with the AW samples, the microstructure characteristics and mechanical properties of the AA6063 joints after PWHT were significantly improved. The improvement of ultimate tensile strength, and impact strength are 3.72% and 22.22% respectively. Keywords: GTAW, PWHT, SEM, EDS. I.INTRODUCTION Aluminium alloys have been widely used in many fields such as the construction, transportation and aerospace owing to their excellent performance, including light weight, high strength and ductility, good corrosion resistance and abundant resources [1]. Among the various heat-treatable aluminium alloys, AA6063 aluminium alloys possess a good combination of strength and toughness with excellent weldability and extrudability, which makes this alloy an preferred choice for Automotive outer bodypanels, railcars, etc. buildings (doors, windows, ladder, etc), marine(offshore structure, etc), heating(brazing sheets, etc)]. This type of aluminium alloy contains Magnesium(Mg) and Silicon(Si) as its major alloying element. Welding is one of the most common joining methods for aluminium alloys. Tungsten inert gas (TIG) process and gas metal arc welding (GMAW) are the most-used welding processes [2]. GMAW possesses advantages of high deposition rate, high welding speed and deep penetration, but excessive heat input brings particularly in welding of thin aluminium sheets. Hence, TIG welding process is preferred over gas metal arc welding so as to obtain high quality weldments [3]. The TIG welding used in this work as AC tungsten inert gas (ACTIG). Moreover, the output of pulsed current can also strengthen the molten pool stirring to produce refined grains. In terms of weldability [6], AA6063 suffers from a substantial decline in strength after welding. The loss of strength is because the rapid melting and solidification process makes all the strengthening precipitates dissolve into the aluminium matrix and complete dissolution of the precipitates can not take place in weld metal and overaging appear in HAZ and meanwhile solute segregation and grain coarsening also come up [11]. Therefore, the post weld heat treatment (PWHT) can be implemented as an effective method of minimizing the softening and improving the properties of welded joints. PWHT has been demonstrated to be a practical option to regain the strength of the joints by modifying the size, shape and distribution of th...

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“…Many welding processes could be used in the aluminum alloy. The most widely used welding process in high speed trains is still MIG (Metal-Inert Gas) [6][7][8] . Until now there is lack of study on the fatigue property of Al-Zn-Mg alloy welding joints.…”

mentioning

confidence: 99%

Fatigue Property of Al-5Zn-2Mg Aluminum Alloy Welding Joints Used in High-speed Trains

Yang

Jia

et al. 2016

Rare Metal Materials and Engineering

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The fatigue property of Al-5Zn-2Mg aluminum alloy Metal-Inert Gas (MIG) welding joints used in high-speed trains was studied by a fatigue machine. Scanning electron microscopy (SEM) was used to observe the fatigue fracture and the surface damage. The results show that uniaxial ratcheting behavior occurs in the welding zone (WZ) when the stress is higher than 0.5σb; there are obvious plastic deformations in the WZ and a lot of slip bands on the surface, which reduce the fatigue life of the sample. The uniaxial ratcheting behavior mainly appears in the first cycle and the final failure stage of the fatigue process. When the stress is lower than 0.5σb, the fatigue samples crack in the heat affected zone (HAZ). The fatigue fracture of the WZ and the fusion zone (FZ) is typical ductile fracture pattern while that of the HAZ and the base metal (BM) is quasi-cleavage fracture. The fatigue life of the BM is much longer than that of the HAZ.

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Comparison of FSW and TIG welded joints in Al-Mg-Mn-Sc-Zr alloy plates

Cited by 56 publications

References 22 publications

Microstructures and mechanical properties of Gas Tungsten Arc Welded joints of new Al–Mg–Sc and Al–Mg–Er alloy plates

Microstructures and mechanical properties of Gas Tungsten Arc Welded joints of new Al–Mg–Sc and Al–Mg–Er alloy plates

Effect of Post Weld Heat Treatment on Properties of ACTIG Welded Aa6063 Aluminium Alloy Joint

Fatigue Property of Al-5Zn-2Mg Aluminum Alloy Welding Joints Used in High-speed Trains

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