METHOD OF PIPE LASER WELDING Russian patent published in 2017 - IPC B23K26/262 B23K26/70 

FIELD: electricity.

SUBSTANCE: tack welding and laser welding of edge butt are performed. In tack welding three points are specified. The points correspond to the points on the edges of the round billet. And two points are specified on the butt of the edges, which are on the corresponding tangent lines to the transverse plane of the round billet. The coordinates of the given points are measured by scanning the cross section with a laser sensor along the entire length of the round billet storing them in the data base. During laser welding, which is performed in the measured coordinates, stored in the database, virtual construction of the displacement vector of the laser welding head is done when it moves between adjacent edges, and when the laser sensor detects a deviation of at least one point of the edge of the round billet from the one, which is stored in the data base, the laser welding head is moved in the direction of the vector, constructed on the previous area of the seam.

EFFECT: invention provides the accuracy of pointing the laser welding head at the edge butt during the laser welding of round billets in areas that have defects and deviations that prevent tack welding.

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