Modeling and analysis of residual stress distribution in butt welded joint with thorough penetration taking into account influence of groove weld

A chamfering of the joining sheet edges is often used in welding practice. In work, the analysis of groove weld input on residual stress distribution in single-pass butt welded joints with thorough penetration is presented. For this purpose, comparative calculations of instantaneous and residual stresses in two steel flat bars were made. The butt welded joints of S235 steel elements put to the analysis. Numerical simulations were conducted for joint with welding groove and for joint without chamfering of flats. The calculations include strains caused by temperature changes as well as the effect of phase transformations. For calculations are used authors' programs made in Borland Delphi. The results are presented in the form of temperature, volume phase fraction and stress distributions in the element's cross section as well as welding thermal cycles and stress history at selected points. The analysis of the results of the calculations showed slight differences in the stress distributions in the heat-affected zones of the considered flat bars, while it did not show significant differences in stress levels outside these areas. (paper)