Abstract
Fatigue properties of butt-welded joints were investigated for four types of aluminum alloys, 5083-O, 7N01-T6, 7N01-T5 and 6N01-T5. The fatigue strength of the butt-welded joints were nearly the same for the four alloys and generally lower by a factor of about three than those of base metals. The fatigue strength after 108 cycles was independent of the tensile strength in the case of butt-welded joints, while it was proportional to the tensile strength in the case of base metals. By comparison with the typical structural steels. HT80, SM50B and SUS304HP, a unique relationship was found between converted elastic strain range, Δσ/E, and fatigue life, Nf, for the welded joints of the steels and the aluminum alloys investigated, where Δσ and E are stress range and Young's modulus, respectively.
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