Stremeckas Š. Strains and deformations state research of louded welded joint with circular soft seam: Master thesis of mechanical engineer / research advisor associate prof. habil. dr. A.Bražėnas, Šiauliai university, department of technologic, department of mechanical engineering. – Šiauliai, 2006. – 30 p. Welded joints has an important part in production of ships, machines, buildings and other important industrial parts. These joints are mostly in the concentration zones of important constructions from which belongs their strenght and durabily because during the work the proportional limits of materiais are exceeded and there static or cyclic elasto-plastic strain appears. Therefore investigations of these welded joints are very important. In the first chapter there is a review about mechanically heterogeneous welded joints. It describes parameters of simetric welded joint with simple soft seam. The second chapter presents analysis of separate welded joint parameters. Obtained analysis allows appraise condition of mild and hard materials and properly evaluate state of welded joint from which belongs construction strenght and durability.