Vacuum brazing process for ATR case

Abstract

According to the vacuum brazing process for the ATR case, external temperature control thermocouples are additionally arranged in an unoccupied thermocouple channel of equipment, the first set of thermocouples are tightly attached to the outer side surface of the ATR case, the second set of thermocouples are tightly attached to the inner side surface of the ATR case, and the third set of thermocouples are tightly attached to an inner weld joint at the upper right corner of the ATR case; and then the purpose of vacuum brazing is achieved through parameter adjustment of different preheating and temperature rising intervals. According to the method, rapid heating can be met, the heat preservation time can be prevented from being prolonged, the duration of the heating process of the ATR case is effectively shortened, it is guaranteed that the temperature of the ATR case can be rapidly and evenly increased, vacuum brazing is smoothly carried out, the situation that the vacuum degree is insufficient in the whole process is avoided, it is guaranteed that welding lines cannot be oxidized, and the service life of the ATR case is prolonged. And the problems of appearance deformation, stress concentration, welding seam oxidation caused by vacuum degree reduction and the like due to a power-off rapid cooling mode are avoided.

Description

technical field [0001] The invention relates to the technical field of vacuum brazing, in particular to a brazing process for forming an aluminum alloy ATR case. Background technique [0002] The ATR chassis is generally composed of various parts, which are formed by vacuum brazing by fixing the solder with special tooling. Due to the problems of many parts, complex structure shape and many welding seams of ATR chassis, especially for aluminum alloy ATR chassis, after vacuum brazing, it is easy to have defects such as strength reduction, unmelted solder, weld oxidation and other defects, resulting in the yield rate of ATR chassis Low. The current process in the industry is mainly to control parameters such as setting temperature, holding time, vacuum degree and cooling method, mainly through the fastest possible heating rate and long holding time to ensure that the ATR chassis can meet the actual required brazing temperature. The actual temperature of the ATR chassis in th...

AI Technical Summary

Problems solved by technology

This will lead to uneven temperature rise of ATR chassis parts, which will easily cause problems such as dimensional deformation after forming or local brazing filler metal not melting, and a longer time of heat preservation will make the ATR chassis undergo a long-term heat treatment, and the base metal and brazing filler metal will appear. Problems such as magnesium evaporation, coarse grains, and reduced strength after forming appear

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