Method for touching up metal parts

摘要

The process for altering an assembly of metal parts (2, 3) based on nickel or cobalt alloy by high temperature brazing in a furnace, comprises altering the brazed zones (5) of metal parts using a pulsed mode laser (10) with a power of 1500-3000 W, and protecting the brazed metal parts against oxidation (20) using a gaseous protection device. The altered zones are provided with a supply metal, which is in the form of powder, paste, grains or sintered preforms and is compatible with a metal that is used during the initial brazing of metal parts. The process for altering an assembly of metal parts (2, 3) based on nickel or cobalt alloy by high temperature brazing in a furnace, comprises altering the brazed zones (5) of metal parts using a pulsed mode laser (10) with a power of 1500-3000 W, and protecting the brazed metal parts against oxidation (20) using a gaseous protection device. The altered zones are provided with a supply metal, which is in the form of powder, paste, grains or sintered preforms and is compatible with a metal that is used during the initial brazing of metal parts. The laser has a frequency of 4-8 Hz and impulsion time of 5-15 ms, and is controlled in a semi-manual manner. The rise time of laser impulsion time is lower than the fall time.