Joining Ti6Al4V and AISI 304 through friction stir welding of lap joints: experimental and numerical analysis

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Abstract

The results of an experimental and numerical analysis on Friction Stir Welding of dissimilar lap joints made out of AISI304 and Ti-6Al-4 V thin sheets are presented. The mixed joints, welded with varying process parameters, have been characterized from a mechanical and metallurgical point of view. A numerical model able to take into account the behaviour of the two different materials has been used. The numerical results have been utilized to explain the joint properties and the occurring material flow. The effect of the heat input, tilt angle and sheets mutual position has been investigated. It is found that both hooking defects and tunnels may occur with incorrect choice of process parameters. Good nugget integrity is obtained when the titanium sheet is used as upper sheet and high heat input is conferred to the joint. Finally, welding speed influences the nugget morphology as low values contribute to minimize the formation of the hooking defect.
Lingua originaleEnglish
pagine (da-a)59-70
Numero di pagine12
RivistaInternational Journal of Material Forming
Volume9
Stato di pubblicazionePublished - 2016

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Friction stir welding
Joining
Numerical analysis
Titanium sheet
Defects
Numerical models
Tunnels
Welding
Welds
Hot Temperature
titanium alloy (TiAl6V4)

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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title = "Joining Ti6Al4V and AISI 304 through friction stir welding of lap joints: experimental and numerical analysis",
abstract = "The results of an experimental and numerical analysis on Friction Stir Welding of dissimilar lap joints made out of AISI304 and Ti-6Al-4 V thin sheets are presented. The mixed joints, welded with varying process parameters, have been characterized from a mechanical and metallurgical point of view. A numerical model able to take into account the behaviour of the two different materials has been used. The numerical results have been utilized to explain the joint properties and the occurring material flow. The effect of the heat input, tilt angle and sheets mutual position has been investigated. It is found that both hooking defects and tunnels may occur with incorrect choice of process parameters. Good nugget integrity is obtained when the titanium sheet is used as upper sheet and high heat input is conferred to the joint. Finally, welding speed influences the nugget morphology as low values contribute to minimize the formation of the hooking defect.",
keywords = "FEM, Friction stir welding, Lap joints, Materials Science (all), Stainless steel, Titanium alloys",
author = "Gianluca Buffa",
year = "2016",
language = "English",
volume = "9",
pages = "59--70",
journal = "International Journal of Material Forming",
issn = "1960-6206",
publisher = "Springer Paris",

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TY - JOUR

T1 - Joining Ti6Al4V and AISI 304 through friction stir welding of lap joints: experimental and numerical analysis

AU - Buffa, Gianluca

PY - 2016

Y1 - 2016

N2 - The results of an experimental and numerical analysis on Friction Stir Welding of dissimilar lap joints made out of AISI304 and Ti-6Al-4 V thin sheets are presented. The mixed joints, welded with varying process parameters, have been characterized from a mechanical and metallurgical point of view. A numerical model able to take into account the behaviour of the two different materials has been used. The numerical results have been utilized to explain the joint properties and the occurring material flow. The effect of the heat input, tilt angle and sheets mutual position has been investigated. It is found that both hooking defects and tunnels may occur with incorrect choice of process parameters. Good nugget integrity is obtained when the titanium sheet is used as upper sheet and high heat input is conferred to the joint. Finally, welding speed influences the nugget morphology as low values contribute to minimize the formation of the hooking defect.

AB - The results of an experimental and numerical analysis on Friction Stir Welding of dissimilar lap joints made out of AISI304 and Ti-6Al-4 V thin sheets are presented. The mixed joints, welded with varying process parameters, have been characterized from a mechanical and metallurgical point of view. A numerical model able to take into account the behaviour of the two different materials has been used. The numerical results have been utilized to explain the joint properties and the occurring material flow. The effect of the heat input, tilt angle and sheets mutual position has been investigated. It is found that both hooking defects and tunnels may occur with incorrect choice of process parameters. Good nugget integrity is obtained when the titanium sheet is used as upper sheet and high heat input is conferred to the joint. Finally, welding speed influences the nugget morphology as low values contribute to minimize the formation of the hooking defect.

KW - FEM

KW - Friction stir welding

KW - Lap joints

KW - Materials Science (all)

KW - Stainless steel

KW - Titanium alloys

UR - http://hdl.handle.net/10447/168985

UR - http://www.springer.com/engineering/production+eng/journal/12289

M3 - Article

VL - 9

SP - 59

EP - 70

JO - International Journal of Material Forming

JF - International Journal of Material Forming

SN - 1960-6206

ER -