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Effect of joint line remnant on fatigue lifetime of friction stir welded Al-Cu-Li alloy

Abstract : The effect of joint line remnant (JLR) on the fatigue lifetime of friction stir welds of a 2198 Al alloy in T851 condition has been assessed experimentally. The base material, sound welds (welded in one sheet) and welds with JLR (produced via welding of two sheets with a natural oxide layer) have been investigated. A strong decrease in microhardness is found for the weak weld zone that is consistent with the reduction in tensile properties compared to the base material: 45% in yield strength and 22% in ultimate tensile strength. The fatigue strengths of sound and JLR bearing welds at 100 000 cycles (R=0·1) are reduced by 10 and 15% respectively compared to the base material. Only for one-third of the JLR bearing specimens, the fatigue crack initiated in regions close to the JLR and this without reduction in fatigue lifetime.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00553188
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Submitted on : Thursday, January 6, 2011 - 4:42:26 PM
Last modification on : Thursday, September 24, 2020 - 6:30:07 PM

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Thomas Le Jolu, Thilo F. Morgeneyer, Anne-Françoise Gourgues-Lorenzon. Effect of joint line remnant on fatigue lifetime of friction stir welded Al-Cu-Li alloy. Science and Technology of Welding & Joining, 2010, 15, pp.694-698. ⟨10.1179/136217110X12813393169453⟩. ⟨hal-00553188⟩

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