TUBE ELECTRON-BEAM WELDING METHOD Russian patent published in 2006 - IPC B23K31/02 B23K15/02 B23K33/00 B23K101/06 

FIELD: electron-beam welding of tubes, possibly manufacture of ducts of nuclear reactors by welding tubes of zirconium and titanium.

SUBSTANCE: on lateral surface of end portion of one tube annular protrusion is formed with cross section in the form of isosceles triangle; apex of one angle of base of said triangle is arranged on outer edge of tube. End of tube at said side of tube is tapered inside tube till inner edge of tube end which is shifted by turning in lathe along axis of tube inside tube from tube end by value equal to half of protrusion base. End of other tube is tapered outside tube till inner edge shifted outside by the same value. Then tube butts are joined, and for one revolution of butt additive protrusion and tube ends are simultaneously fused by means of concentrated laser beam.

EFFECT: lowered cost of electron beam welding of thick wall tubes as additive wire and device for feeding it to welded seam zone are not used, improved strength and corrosion resistance of welded joint.

2 cl, 1 ex, 1 dwg