FIELD: process engineering.
SUBSTANCE: invention relates to device for contact butt welding with preheating of compact-section ring-shaped articles to be used at special-purpose butt-welding machines. Linear size of the billets outer semi-circle line is measured to calculate allowance for shortening, removal of overmeasure, flash-off and shrinkage allowances. Required part circumference and measured semi-circle size are entered into control system. Control system is used to compute initial jaws spacing and final distance between jaws with required allowance for shortening. First butt is welded. Actual shortening is compared with preset one. In case they differ, new initial jaws spacing for second butt is computed. Second butt is welded by first butt cycle.
EFFECT: higher precision of diameter and ambit.
1 dwg
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