Effect of preliminary laser treatment of 12Cr18Ni10Ti steel surfaces on their diffusion welding

Abstract

Specific features of the influence of laser processing applied to surfaces of 12Cr18Ni10Ti stainless steel samples on formation of bonding by the diffusion welding are considered.  The laser fluency was 2.1; 3.2 and 4.3 J/sm2, the diameter of spot was 220 µm. The beam scanning was carried out both in one direction and in two perpendicular directions. As a result of the laser processing with different mode parameters, there on their surfaces are formed microroughnesses of different heights. The researches demonstrated that the size of these microroughnesses is the main factor having an influence on the strength of welded joints. It agrees well with the data of experiments carried out earlier. The preliminary laser treatment of welding surfaces before diffusion welding brings a possibility to lower the temperature of a diffusion bonding process.