The welding process of dissimilar materials causes a lot of technological issues related to different properties of materials of joined elements. Thermal conductivity is one of most important factors influencing the deformation of the weld. The change of thermal conductivity in the function of the temperature can produce various strains that cannot be predicted during construction design. Different structures of materials appear during joining of dissimilar materials as well as different characteristic zones of the joint and its mechanical properties. The most important is the proper identification of joint zones and the size of deformation at the production stage of welded construction. This work presents the numerical analysis of physical phenomena in overlap welding of two sheets made of S355 carbon steel and 304 austenitic steel using a laser beam. A three-dimensional discrete model is developed taking into account thermophysical properties changing with temperature. Temperature distribution and the shape of the welding pool is predicted on the basis of performer computer simulations. The influence of thermal load on the formation of stress and strain fields is determined.
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W artykule przedstawiono porównanie dwóch technologii wykonania złącza doczołowego stali P355NH platerowanej wybuchowo stopem Inconel 625. Przedstawiono wpływ zastosowania prądu pulsującego na skład chemiczny ściegów wykonanych metodą 131. Opracowana technologia spawania zapewniła uzyskanie składu chemicznego zgodnie z wymaganiami norm ASME SECTION II, PART A oraz PN-EN 10095:2002.
EN
The article presents a comparison of two welding technologies of butt joints of explosively cladded P355NH - Inconel 625 plate. The influence of applying pulsing current on the chemical composition of stitches made by method 131 is presented. The applied welding technology ensure the chemical composition in accordance with the requirements of ASME SECTION II, PART A and PN-EN 10095:2002.
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