METHOD OF WORKING METAL PIPES WITH V-LIKE BUTTS FOR JOINTING INTO PIPELINE, METAL PIPES, COMBINED WELDING IN ONE WELDING BATH BY LASER AND ELECTRIC ARC

摘要

FIELD: process engineering. ^ SUBSTANCE: invention can be used for working metal pipe butts in producing pipelines. V-like butt is made in identical pipes joint area. Pipes butts are cut so that each butt profile has at least one linear section 3 on inner side designed to produce the section of V-like butt section. Said profile comprises arc-like section 4 connecting profile linear section 3 with rectilinear section 5 inclined to profile linear section 3 on tubular section outer side. Arc-like section is produced so that it changes into inclined rectilinear section. ^ EFFECT: worked butt allows fast penetration rate in combined laser welding. ^ 8 cl, 1 dwg