期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 15, 期 8, 页码 694-698出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/136217110X12813393169453
关键词
Friction stir welding; Fatigue; Joint line remnant; Al-Cu-Li
资金
- French Federation for Aircraft and Space Research
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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