File:Pin Shapes for High Rotation Speed Friction Stir Welding Joint of a 6061-T6 Aluminum Alloy Sheet; S1 = quadrangular prism, S2 = quadrangular frustum pyramid and S3 = frustum. Yang Zhou et al, Metals 2018, 8(12), 987, CC BY 4.0.jpg
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Pin_Shapes_for_High_Rotation_Speed_Friction_Stir_Welding_Joint_of_a_6061-T6_Aluminum_Alloy_Sheet;_S1_=_quadrangular_prism,_S2_=_quadrangular_frustum_pyramid_and_S3_=_frustum._Yang_Zhou_et_al,_Metals_2018,_8(12),_987,_CC_BY_4.0.jpg (550 × 380 pixels, file size: 68 KB, MIME type: image/jpeg)