COLD PRESSURE WELDING OF PARTS FROM HIGH-STRENGTH MATERIALS Russian patent published in 2015 - IPC B23K20/02 B23K20/16 B23K20/22 

FIELD: process engineering.

SUBSTANCE: invention relates to cold pressure welding of parts from high-strength materials. First, contact surfaces of parts are cleaned to place elastic spacer there between. Note here that used metal spacer with mechanical properties at maximum plastic deformation lower than those of welding parts. Said spacer is pre-perforated to fill made bores with diluted nitric acid. Welding is performed in three steps. Initially, spacer is deformed unless a complete closing of made bores with squeezing of diluted nitric acid residues therefrom. Then, pressure is applied for the period of chemical interaction of said acid with oxide plies of bonding metals. Final deformation is performed to formation of metal bonds on contact surfaces. Spacer depth is selected so that total deformation degree is not smaller than 60% and not over 90%, deformation degree at first step before closing of bores does not exceed 20% while at second step it does not smaller than 50%.

EFFECT: higher efficiency of bonding without preheating.

2 cl, 4 dwg