Finite element analysis of key structures of girth weld grinding platform
To meet the construction and acceptance specifications of oil and gas long-distance pipeline engineering,the residual height of the pipeline weld should be within 0～3 mm,and the transition to the base metal should be smooth.At present,girth welding is mostly done by hand,which results in low efficiency and unstable quality.Now,a girth weld grinding platform has been designed and developed based on the existing automatic grinding system.With the rotation speed and feed speed of the Angle grinder taken as experimental variables,a single-factor experiment was designed to explore the variation range of the platform's bearing force during grinding,and the peak values of the normal force,axial force,and radial force were 78,54 and 20 N,respectively.To improve this platform's stability,a finite element simulation analysis by Abaqus software was carried out and the structure of the axial feed module was optimized.The contact stress between the auxiliary shaft and the mounting track of the crawling module around the pipeline was solved to seek the reasonable wall thickness of the track.The results show that the stress distribution of the module is improved by adding the auxiliary shaft,with the peak stress reduced by 6.26％and the average stress reduced by 53.14％,and that the wall thickness of the track shall not be less than 3.06 mm.
girth weld grindingfinite element analysisstructure optimization
万方数据
维普
