Abstract
Friction stir butt welding of C1020 and A1050 were carried out. To avoid the deterioration of strength and workability of the joints, dispersion of copper fragments into aluminum was suppressed. The effect of tool tilt angle on root flaw at the bottom part was investigated. To obtain unmixed joints, the probe was plunged into only aluminum. Under the condition of tool tilt angle of 0°, equiaxed grains were observed at the bottom of A1050 near the bonding interface. It indicates that material flow and heat input could promote the reaction of copper and aluminum at the bottom part. In contrast, under the condition of tool tilt angle of 3°, unbonded area remained at the bonding interface at the bottom. The lack of penetration near the bonding interface was larger than that of tool tilt angle of 0°.
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