METHOD FOR ELECTRON-BEAM WELDING OF AN ANNULAR JOINT OF THIN-WALLED AND THICK-WALLED PARTS MADE OF DISSIMILAR ALUMINUM ALLOYS Russian patent published in 2023 - IPC B23K15/04 B23K31/02 B23K33/00 B23K103/18 

FIELD: electron beam welding of ring joints.

SUBSTANCE: invention can be used for the manufacture of light structures made of aluminium alloys with high requirements for the strength and tightness of the weld, including the production of heat pipes for systems for providing thermal conditions and thermal control of space vehicles. Electron beam welding is carried out for the ring joint of thin-walled and thick-walled parts made of aluminium alloys with different thermal diffusivity and weldability, whereas the thermal diffusivity of the alloy of the thin-walled part is less than the thermal diffusivity of the alloy of the thick-walled part. The parts to be welded are assembled end-to-end with the direction of the electron beam to the joint and the welding is carried out by moving the electron beam with a symmetrical sweep along the joint of the parts during their rotation around the longitudinal axis. Welding is carried out in two passes by complete rotation of the parts around the longitudinal axis in each pass and with a constant decrease in the value of the heat input at the beginning of the pass to the value of the heat input at the end of the pass. The initial value of the heat input during the first pass is selected in the range from 91,000 J/m to 101,000 J/m, and the initial value of the heat input during the second pass is in the range from 182,000 J/m to 220,000 J/m, and during the first pass, the joint of the parts is exposed to a pulsed defocused or focused beam, and during the second pass, a pulsed focused beam, whereas the pulsed action of the electron beam is carried out with a frequency in the range from 4 to 10 Hz.

EFFECT: improved quality of the circumferential welded joint of thick-walled and thin-walled parts made of aluminium alloys with different thermal diffusivity and weldability.

4 cl, 3 dwg, 2 tbl, 10 ex