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The paper presents the results of strength tests of welded joints of S235JR structural steel. Welded joints of various geometries were made:butt joints, overlap joints withasingle weld, overlap joints with double welds, overlap joints with spot welds, overlap joints with hole welds,and double-flanged seam. The strength tests carried out made it possible to determine the destructive force. Eight joints of each type were made. Based on the results obtained, a statistical analysis was carried outto determine the influence of structural factors on the strength of welded joints and to assess the repeatability of the process of making joints of a given type. This analysis allows verifyingwhich of the tested geometries of welded joints are the most strength and stability, which is especially importantwhen designing new structures or planning renovation of existing structures. The analysis showed that the highest strength as well as the highest repeatability was obtained in the case of overlapped joints with double welds –destructive force at 37 367 MPa. The lowest strength was characterised by double-flanged seam –destructive force 8 603 MPa.
