The paper is devoted to identifying features of structural non-homogeneities formation in dissimilar welded joints of carbon steel 20 to corrosion-resistant austenitic 12Kh18N10T steel, obtained by tungsten inert gas welding (TIG), as well as studying of their influence on the mechanical characteristics of welded joints under static and cyclic loading. Differences in the formation of a diffusion carbide interlayer in weld metal alloyed with nickel and manganese are established. When austenite is alloyed with nickel, bulk carbon diffusion occurs, while in manganese austenite boundary diffusion becomes the main mechanism for carbon diffusion, which occurs mainly along grain and sub-grain boundaries of austenite. As a result of mechanical tests, it was established that under static tension welded joint works under conditions of strengthening by a soft (ferritic) layer due to the restraint of transverse deformations by more solid (carbide) layer. The limits of soft interlayer dimensions, under which the softening of welded joint does not occur, are established that will allow to proceed to the extreme temperature-time parameters of heat treatment and operation of welded joint.

The paper is devoted to investigation of electron beam oscillation parameters influence on the geometry of deposited layers of items by means of electron beam metal wire deposition method. The results of sawtooth, zigzag, sinusoidal and elliptical oscillations application in frequency range of 12.5 ... 100 Hz are described. It is established that using of a sawtooth oscillation facilitates liquid metal flow to the weld pool tail and leads to formation of the narrowest and highest deposited layers. Stabilization of all explored deposited layers geometric parameters is occurred at electron beam oscillation with the frequency of 50 Hz and higher. It was also established that the oscillation amplitude rise leads to increasing of deposited layer dimensions due to redistribution of electron beam energy.