Abstract: The effect of bevel angles and welding heat input on hardness property and microstructures of mild steel weldments was carried out in this work. A pair each of 150 x 50 x 10 mm mild steel specimens with bevel angles of 30o, 45o, 60o and 90o, were manually welded with electric arc welding process. The welded specimens were machined to specification of the test samples. The samples were subjected to microstructural analysis of the weldments and the Heat Affected Zone (HAZ). This was followed by hardness test of the weldments and HAZ of the welded samples. Results showed that the heat input for optimum hardness property is 60o bevel angle (13.61 KJ/mm). The hardness is maximum for the weldment at bevel angle of 60o (173.2 Hv) sample while for the HAZ and the base plate, maximum hardness was attained at 45o (199.5 Hv and 174.5 Hv) bevel angle sample. The microstructures indicated the presence of ferrite (α) and pearlite (α + FeC3). The microstructure has finest grain at 45o bevel angle sample as compared with the base metal of as–received sample.