Investigation of diffusion process activation in pinched surfaces

A diffusion contact process was analyzed during welding without melting occurring in the active protective environment. The three basic activation mechanisms were determined as: impulse melting, chemical melting and contact melting. It was proven that it is possible to activate diffusion processes due to the high rate of reactions that are micro-explosions within micro-volumes on top of the pinched contacting surfaces. A well defined interval of heating values was found. This interval provides suitable conditions for diffusion contact of welded surfaces. Experimentally, it was found that the heating rate interval for diffusion welding of carbon steel and high-alloy steel is 130-200°C/s.