METHOD OF REMOVING FLESH FROM PIPELINE WELD SEAM INNER SURFACE AND FLESH TRIMMER Russian patent published in 2011 - IPC B08B9/55 B23K37/08 

FIELD: process engineering.

SUBSTANCE: flesh is removed by annular cutting tool forced inside pipeline by air or fluid pressure. Flesh trimmer comprises casing with cutting head and support rolls and differs from known designs in that trimmer piston consists of head and tail parts coupled to turn relative to each other in three dimensions. Tail section comprises hollow case with cleaning and supporting disk fitted thereon and separated by spacing elements. Head section consists of casing with cutting heads made up of pyramid-like mandrels with inner cutting surface arranged between two disk supports. Piston differs from known designs in that mandrel surface is provided with cutting edges directed toward pyramid base. Two mandrel sections are used. Said mandrels in one disk are shifted relative to those in another disk.

EFFECT: higher efficiency of cutting.