METHOD OF BRAZING HEAT EXCHANGER WITH SCANNING ELECTRON BEAM AND DEVICE TO THIS END

摘要

FIELD: welding works.;SUBSTANCE: present invention relates to brazing laminated-finned and pipe-shaped heat exchangers in a vacuum and can be used in aircraft engine-building and other fields of engineering. In the method of brazing a heat exchanger with a scanning electron beam, the brazed objects are put into a vacuum, heated, held and then cooled. The degree of irregularity of heating is determined and temperature equalisation is then done on the brazed surface until attaining a given brazing temperature by varying the brazing parametres. The device for implementing the method has a vacuum chamber with an illuminator, an electron beam gun with a two-dimensional beam deflection system and power supply unit, and a sweep generator of the electron beam, connected to the two-dimensional beam deflection system of the beam gun. A control unit is connected to the power supply of the electron beam gun and the sweep generator of the electron beam. The device also has a thermal radiation detector and an information computer system, connected to the thermal radiation detector and made with provision for displaying the temperature field of the brazed surface of the object.;EFFECT: use of the invention provides for stable, quality brazing and increases output of the brazed objects, with deep end-to-end channels.;9 cl, 1 dwg