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Abstract
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The effect of rotational and traverse speeds during
dissimilar butt friction stir welding of Al 5083-H321 and
316L stainless steel plates was studied. The macrostructure
and microstructure of the joints were examined using optical
microscope and scanning electron microscope equipped with
energy-dispersive X-ray analysis. The strength of the joints
was measured using tensile test. The results showed that with
increasing the rotational speed, the tensile strength of the
joints increased up to a maximum value and then decreased.
In addition, decreasing the traverse speed resulted in higher
tensile strength. The 238-MPa maximum value of the tensile
strength was achieved at rotational speed of 280 rpm and
traverse speed of 160 mm/min. The formation of surface and
cross section defects at lower rotational speeds and higher
traverse speeds and existence of cracks and microcracks at
higher rotational speeds were responsible for the lower tensile
strengths of the corresponding joints. In addition, the FeAl3
intermetallic compound was detected in the interface of the
steel particles and Al.
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