The application of nanotechnologies and nanomaterials in welding production is reviewed. The methods of joining the materials with special properties are investigated; the application of nanopowders in fusion welding and surfacing is discussed. The aim of this procedure is to reduce the effect of stress concentrators (defects) and also of nanolayer films and foils in pressure welding.

The paper considers the influence of nanostructured powder-modifiers on transfer of the electrode metal drop and the microstructure of a surfaced metal in consumable electrode welding in argon shielding. It is found, that welding with the nanopowder Al₂O₃ is the most consistent process and application of nanostructured powders enables controlling the structure and the morphology of a surfaced metal.

This paper presents results of experiments on how tungsten, molybdenum and aluminum oxyhydroxide nanopowders, imbedded into the weld pool, affect corrosion resistance and mechanical properties of welded joints. It is shown that nanopowders have a significant effect on the intergranular corrosion of the weld.

The experimental studies were carried on for the test samples of welds of the steel 12X18H10T; the results are presented. The effect produced by the nanostructured modifying powders added to the weld pool on the quality of weld joints was examined. The weld joints were obtained by arc welding in argon atmosphere using consumable electrode. Due to the weld pool modification, the dendrite size was found to decrease and a more equilibrium microstructure would form in the weld material.

Addition of nanopowders of tungsten and aluminum oxyhydroxide to the weld pool has shown positive effect on the structure of metal during arc gas welding with a consumable electrode. It has been shown that introducing the powders decreases dendrite size and leads to the formation of a more equilibrium micrоstructure.