PROCESS OF MACHINING OF RING WELDS OF JOINTS OF PIPES (VERSIONS) Russian patent published in 1995 - IPC

FIELD: manufacture of pipe-lines. SUBSTANCE: heating of weld and its plastic deformation are carried out when machining ring welds of joints of pipes. In compliance with first version power action on material of weld is performed by axial turn of one pipe relative to the other one at temperature within range from 0.5 to 0.8 T_melt, where T_melt is melting temperature of material of weld. In agreement with second version weld in melted state is laterally extended up to making it thinner by 20% and power action is conducted by upsetting of pipes at temperature within range of (0,5-0,8)T_melt. EFFECT: enhanced productivity and efficiency. 2 cl