METHOD FOR WELDING CONSTRUCTIONAL MEMBERS WITH PIPELINE Russian patent published in 2006 - IPC B23K31/02 B23K33/00 B23K101/04 B23K101/10 

FIELD: processes for welding reinforcing constructional member with main pipeline under pressure.

SUBSTANCE: method comprises steps of making constructional member 2 of two parts; placing it onto cleaned portion of pipeline 1; mutually welding them by lengthwise seams without electric arc touching of pipeline wall; placing at both sides of constructional members technological rings 3 spaced from member by predetermined distance and having two halves joined by lengthwise seams; welding constructional member 2 with technological rings 3 at forming lap-butt joints after preliminarily dressing end surfaces for chamfering edges; placing constructional member 2 on cleaned portion of pipeline 1 at gap no more than 0.5 mm; forming cavity in inner surface of ends of welded constructional member 2 and technological rings 3 by inversely chamfering by depth 1.0 - 1.5 mm and angle 30 - 45°; at welding partially filling formed cavity with melt metal.

EFFECT: enhanced quality and reliability of welded joints of slit type constructional members and main pipeline.

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