A new method for evaluating wedges of steel plates and strips

To overcome the inaccuracy problem of the traditional wedge evaluation of steel plates and strips caused by the randomness of the thicknesses of two local points and improve the reliability of the wedge index, the double-centroid method for the wedge evaluation was proposed, and a model based on the centroid theory was established. Meanwhile, an integral model for the discrete thickness values of the cross-section profiles was derived. The discussion focused on the distinct characteristics of the two-point method, asymmetric method, and double-centroid method in evaluating the asymmetric distribution of cross-sections. The three methods were employed to evaluate the wedge values of both the theoretical and measured cross-sections of steel plates and strips, and the accuracies of three wedge evaluation models were analyzed and discussed. The results showed that the double-centroid method objectively reflects the degree and variation characteristics of the wedge values of the cross-sections of steel plates and strips, and this method is feasible, reliable, and outstanding.