A method of predicting the hardness of welded joints based on the parameterization of their microstructures comprising preparing a reference sample, by cutting a sample of the product, grinding it, polishing, etching, subsequent photographing microstructure preparation for analysis in the program MFRDrom, by digitizing and converting microstructures computation according to the algorithm uniformity and regularity, characterized in that, after polishing and etching of the sample is measured on the cross section hardness of weld hardness, photos grafirovanie microstructure is carried out in measuring points of hardness, after calculating the homogeneity values and ordering adjusted depending on the hardness of homogeneity and regularity values over the cross section of the welded joint, prepare test samples welds by grinding, polishing, etching, photographed samples at points prediction hardness, the program determines values uniformity and regularity, the coincidence of homogeneity and regularity values with the values of the homogeneous NOSTA ordering and reference judged hardness of the samples obtained under the same welding conditions.
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