Safety cages, constituting essential equipment in sports cars, aim to reduce consequences of potential accidents. These structures should provide the highest possible and reproducible level of workmanship aimed to ensure their strength as that assumed at the design stage. Because of the fact that welding is the primary technology used in the fabrication of safety cages it is highly necessary to analyse the effect of welding parameters as well as the choice of welding methods on process repeatability and strength properties of welded joints. The aim of this study was to determine the influence of the welding method on the strength of test cruciform joints of tubes as well as to investigate the effect resulting from the change of MAG and TIG welding current parameters on the linear deformation of welded joints. The article discusses the effect of welding process conditions on the static strength of cruciform joints in steel E355 +N (used in the fabrication of safety cages). The tests revealed that an increase in heat input during welding significantly reduced the strength of cruciform joints as well as significantly contributed to an increase in post-weld linear deformation, which, in terms of spatial safety of cage structure, could lead to a significant pile-up of stresses.