METHOD OF WELDING ANNULAR INSIDE SEAMS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC B23K9/167 B23K37/02 B23K31/02 

FIELD: electricity.

SUBSTANCE: according to the method, a collar is made on one of the pipes, which is positioned over the welded end of the other pipe. A burner is set in the welding pipes with the location of the electrode rotation axis and the electrode end on different sides relative to the burner rotation axis and the electrode is rotated by eccentricity amount. Welding is carried out in two passes of the electrode, wherein the root seam is made during the first pass, and the metal of the collar is directed towards it during the second pass. The device comprises a burner, a holder and an endoscope mounted in the through-channel provided in the burner. The burner is rotatably mounted and the electrode holder is mounted on the burner with the possibility of eccentric rotation relative to the burner rotation axis.

EFFECT: group of inventions allows to weld raked out full-strength seams from the inside when the diametre of the welded joint exceeds the diametre of the inlet channel, through which access to the welding location is ensured.

5 cl, 9 dwg