METHOD FOR LASER WELDING OF PRECISION PARTS Russian patent published in 2004 - IPC

FIELD: welding processes and equipment, namely laser welding of precision parts, mainly axially symmetrical cylindrical articles, possibly in machine engineering and instrument making.

SUBSTANCE: method comprises steps of separating laser beam by two similar intensity beams with common focal plane in final portion of path; defining path for beam propagation; placing optical beams in final portion of path in the same plane as symmetry axis of article and orienting them in said plane by inclination angle α to line normal relative to common focal plane and determined by expression (-50ε )≤ α ≤(+50ε ); setting distance L between optical axes in common focal pane according to relation L = D, where D - nominal size of parts; performing focusing; controlling coincidence of irradiated surface; realizing welding process after preliminarily tack welding simultaneously by means of two beams according to cross like pattern; turning article around rotation axis by angle approximately equal to 45° from center of tack welding and welding by means of two beams at least in two diametrically opposite portions of butt; rotating unit by 90° around rotation center from center of tack welding; welding simultaneously by means of two beams along butt at rotating article in angle range 0 - 180°.

EFFECT: lowered deformation of precision axially symmetrical welded articles.

2 cl, 1 dwg, 1 ex