Rezumat
CZU 621.791.4: 537.5
The paper presents the results of the study of the effect produced by the pulse current parameters on the changes, during welding of solid heterogeneous metals, in the contact area between the weldable surfaces. The composite from low-carbon steel and copper (steel 20 and copper М1) compressed by the pressure of 50 МPа has been used to determine the most preferable range of changes of pulse current parameters. They are: by an amplitude of current density with regard to the skin-effect within the range from 1∙109 to 2∙109 А/m2, and by the specific total energy of treatment within the range from 0.6∙109 to 1∙109 J/m3 in which an efficient control of processes of plastic deformation of surfaces is feasible, and hence of the formation of butt-welded joints.
Keywords: welding, heterogenous metals, solid state, physical contact formation stage, plastic deformation, high density current pulse, electroplastic effect, contact electrical resistance.