The effect of pin diameter, tool penetration depth and plate arrangement on mechanical and metallurgical properties of 6061-T6 and 5052-T32 aluminum dissimilar joints in friction stir spot welding (FSSW).

14 indicates that reducing the tool pin diameter results in an increasing trend in the joint breaking force.

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However, with increasing tool penetration depth to 1.5 and 2.5 mm, the microhardness in this zone has shown a decreasing trend.

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