MODELLING OF THERMAL PROCESSES IN A DISSYMMETRICAL WELDED CAST ALUMINIUM DESIGNS

Abstract: Number of constructions, produced from eutectic silumins are continually increasing, therefore problem of their welding became very actual. Eutectic aluminium- silicon alloys are sensitive to changes of a welding thermal cycle. These cast aluminium alloys constructions after welding have large residual stresses, and mechanical properties of welded joint deteriorate. It is difficult to define welding regime in case of complex construction shape, especially near the component edges and other components with different wall thickness, using classical calculation methods. Most useful way to define heat input, optimal welding current and speed is simulating of welding process using finite elements method (FEM). The mentioned method enables to achieve lower size of the heat affected zone and better quality of welded joint