METHOD FOR SECURING TUBES IN TUBE WALLS Russian patent published in 1999 - IPC

FIELD: plastic metal working, namely processes for securing tubes in tube walls due to localized oriented plastic deforming of tube material. SUBSTANCE: annular protrusions are formed on outer surface of tube end portions. Then tube is arranged in tube wall opening with annular rectangular cross section grooves in such a way that to provide coincidence of protrusions and grooves. Tube is fixed against possible axial motion and then it is secured to wall by applying compression effort at side of tube inner surface. Tube is formed due to connecting its base along its ends with tips having inner annular protrusion on end joined with tube base. Annular protrusions of tube are formed with trapezoidal cross section on their tips. At process of tube securing tube-and-tip joint assembly is fixed between wall and inner annular protrusion of tip. Tip is joined with tube base by welding. EFFECT: provision of tube joint with desired parameters of strength. 4 cl, 3 dwg