摘要
Abstract
Taking the Φ610 mm×9.5 mm L450M JCOE LSAW pipe as the research object,a systematic analysis is conducted to identify the variation laws of key pipe end dimensional indicators,such as the forming seam"pouting"and out-of-roundness throughout the entire forming-welding-expansion process,and reveal the dimensional accuracy control mechanism,based on which,a targeted full-process collaborative control technology is developed.As a result precise control of the forming seam"pouting"and out-of-roundness at the pipe end is obtained by means of optimizing the involute-type forming die,constructing a closed-loop control system for pre-bending,suppressing dimensional amplification during welding,and implementing defect pre-compensation in the expansion process,etc.The actual application result shows that the above mentioned technology significantly improves the shape dimensional accuracy of the pipe end,getting the primary qualification rate of the steel pipe ring weld enhanced from 92.0%to over 98.5%so as to obviously improve the construction efficiency and the ring weld quality as well.关键词
直缝埋弧焊管/小直径/噘嘴/不圆度/全流程协同Key words
LSAW pipe/small-sized/pouting/out-of-roundness/full-process collaboration
