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The role of tilt angle on strength and microstructural attributes of friction stir welded AZ91C Mg plates was investigated by employing three tilt angles. The presence of unique semicircular-shaped impressions on the surface of the joints attained at 1° tilt angle revealed the generation of ideal heat volume and transfer of plasticised metal towards the trailing end for attaining enhanced fusion. Zone of nugget of the joint obtained during 1° tilt angle, possessed smaller sized grain structures. The strength of joints escalated from 188 to 205 MPa (nearly 86% of the parent metal) when tilt angle was raised from 0° to 1°. But at 2° of tilt angle, strength reduced drastically, declaring the impact of tilt angle is a parabolic category of variation.

Tilt angle impact on strength, microstructure of friction stir welded AZ91CMg plates