Titus Wanazusi, all dimensions are presented in ASTM E8/E8M. When you are testing welded parts to characterize weld material, using uniaxial samples perpendicular to the weld line is not recommended. Because the neck forming in the weld is not guaranteed. So you cannot capture the realistic post-necking behavior of the welds. In this case, you can consider taking samples parallel to the weld line (assuming enough width and the isotropic material) or using notched specimens.