Prokhorenko D. Development and application of complex sections method for the calculation of residual strains by welding longitudinal welds of one-dimensional constructions.

The generalized mathematical model of engineering complex sections method (CSM) on basis of shrinkage function for calculation residual strains and long axis flexure by welding longitudinal welds of one-dimensional welded constructions (ODWC) for schemes of heating by powerful fast moving line source and movable line source is produced in this work. On the basis of CSM work up mathematical models, algorithms and programs for optimization rate of energy input by welding longitudinal welds second order by the criterion of absence residual flexure for some type geometrical shape of ODWC cross-section: rectangular (band with two heated long edge), symmetric H section with band different width, box-shaped section with two or four longitudinal weld. In that cases, when optimization rate of energy input at welding second order seams is impracticable in view of geometrical sectional shapes singularity the mathematical model for method of calculation technological parameters of thermal correcting residual flexure of ODWC with cross-section standard type is developed. The algorithms, programmes and numerical calculate model tasks of residual flexure thermal correcting to four type section has been developed and accomplished: rectangular (band with heated long edge), T-shape, H section with band of different width, box-shaped section with two one-sided longitudinal welds.