METHOD OF FORMING BUTT WELDS ON PIPES Russian patent published in 2006 - IPC B23K31/02 B23K37/00 B23K101/10 F16L13/02 

FIELD: mechanical engineering; plastic metal working.

SUBSTANCE: invention relates to forming of butt welds on pipes, at production of pipe studs and U-shaped bundles using localized hot plastic deformation of weld and adjoining near-weld zones. Preparatory operations are carried out on pipes 1 to be connected. Pipes are assembled with provision of contact at end faces. Intermediate member 2 in form of bushing made of filler material is arranged on outer surface of assembled pipes symmetrically relative to butt. Radial compression force is applied to outer surface of bushing to form contact residual stresses between members to be connected. Bushing material and pipe material are welded to each other. Hot butt is subjected to radial upsetting in mandrel to finally form inner surface of butt joint by mandrelling.

EFFECT: provision of quality butt weld without defects and near-weld zone of required structure and mechanical properties.

7 dwg