Pengaruh diameter pin dan dwell time tahap kedua terhadap kekuatan geser pada pelat tipis alumunium aa 1100 dengan pengelasan two-stage refilled micro friction stir spot welding (TFSSW) = Effect of tool diameter and second stage dwell time to shear strength on two-stage refilled friction stir spot welding (TFSSW) of thin plate alumunium aa 1100