Material flow in heterogeneous friction stir welding of thin aluminium sheets: Effect of shoulder geometry

Leal, Rui M.; Leitão, C.; Loureiro, A.; Rodrigues, D.M.; Vilaça, Pedro

doi:10.1016/j.msea.2008.08.018

Cited by 155 publications

(77 citation statements)

References 38 publications

(78 reference statements)

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“…Many researchers have investigated the material flow patterns during FSW by analyzing the characteristics of welding defects [24][25][26][27]. Inversely, in this study, the material flow patterns are utilized to explain the formation mechanisms of welding defects.…”

Section: Materials Flow Patterns During Underwater Fswmentioning

confidence: 99%

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Zhang

Liu

2012

Metallogr. Microstruct. Anal.

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Underwater friction stir welding (FSW) has been demonstrated to be a promising method for strength improvement of heat-treatable aluminum alloy joints. However, when improper welding parameters are utilized, welding defects, such as voids can be produced in the joints, leading to dramatically deteriorated mechanical properties. Thus to obtain high-quality underwater joints, it is necessary to understand the variables that promote the formation of these defects. In this study, the characteristics of welding defects in underwater joints were examined, and the formation mechanisms of the defects were investigated by analyzing the material flow patterns during underwater FSW. The results indicated that welding defects can occur at both low-and high-rotation speeds (HRS). The defects formed at HRS can be divided into two types according to the welding speed. When a HRS and a low welding speed are chosen, the material beneath the tool shoulder tends to be extruded into the pin stirred zone (PSZ) after flowing back to the advancing side. This results in a turbulent flow condition, creating void defects in the PSZ. When a high welding speed is coupled with the HRS, a large amount of material from the thermo-mechanically affected zone is dragged into the pin hole, which causes the material of the shoulder stirred zone to fill the pin hole in a downward flow direction. This leads to turbulent flow in PSZ, and creates voids or even groove defects in the as-welded joints.

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Section: Materials Flow Patterns During Underwater Fswmentioning

confidence: 99%

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Zhang

Liu

2012

Metallogr. Microstruct. Anal.

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“…This mechanism acts with particle or their boundary fracture and voids Coalescence. Defects always create stress concentration during tensile [11,12]. Samples that are welded in range (ω/v) 18.58 to 34.84 failed in RS zone and others failed in SZ.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Temperature Distributions of Thin Friction Stir Welded Sheets of AA5083

Sattari¹,

Bisadi²,

Sajed³

2012

MECHANICS

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Thin sheets welding are a complicated process either in conventional or newly developed methods. In this approach friction stir welded (FSW), 0.8mm in thickness 5083 aluminium sheets have been studied. A special fixture, designed for ultra-thin sheets, and a simple cylindrical tool, was used. Tensile test and micro hardness test was investigated. All tested samples are defects free. Mechanical properties show that yield stress off old samples are below the base metal and by increasing in speed ratio (w/v) the average of micro hardness was decreased. Samples were welded at speed ratio range of 18.58 to 34.84 have the best quality of tensile test and micro hardness. Temperature measurement during welding indicate that 430 0C to 510 0C is the best temperature range for defect free joints. Fracture surface analyzed using scanning electron microscope (SEM) which represented Dimpled rupture at defect free joints.

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“…8.3.1.1 Welding of Aluminum Alloys with Other Aluminum Alloys Figure 8.4 shows the transverse cross-sectional image of dissimilar weld created between 1.0 mm AA5182 and AA6061 sheets (Leal et al 2008). A cylindrical tool of 10.0 mm shoulder diameter with a concave (8 from vertical) profile, 3.0 mm cylindrical tool pin with left-handed thread, and 0.9 mm pin height was used.…”

Section: Friction Stir Welding Of Different Alloys With Similar Base mentioning

confidence: 99%

Dissimilar Metal Friction Stir Welding

Mishra

Kumar

2014

Friction Stir Welding and Processing

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Material flow in heterogeneous friction stir welding of thin aluminium sheets: Effect of shoulder geometry

Cited by 155 publications

References 38 publications

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Mechanical Properties and Temperature Distributions of Thin Friction Stir Welded Sheets of AA5083

Dissimilar Metal Friction Stir Welding

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