The Research On Parametric Simulation Of High-frequency Welded Pipe And Its Advantages In Practical Application Based On ANSYS

With the high-frequency welded pipe in the oil and gas industry hasbeen more widely used, how to improve the quality of high-frequencywelded pipe and its advantages in practical application have become thehotspots on research. Based on the finite element analysis software ANSYS,we have done the work on three main areas of the followings.First, In order to improve the weld quality in HFW(high- frequencyweld)pipe, we focused on the main influence of control parameters inHigh-frequency welding at the high-frequency induction heating process.According to the heat equation on the high-frequency induction heatingprocess, based on the thermal analysis module of ANSYS finite element,select the proper model of Line heat source to make up of the APDLprogram, By adjustment of the welding speed, welding current and pipethickness, the stable control of the welding temperature had been achieved.By the temperature measurement of temperature field on welding seam witha set of parameters in theФ219mm High-frequency welding machine atJinzhou Group, the result showed that the calculated temperature fieldmeet the actual temperature field well.Second, In the high-frequency welded pipe production process,eliminate the high-frequency welding residual stresses which caused byHigh-frequency welding is an important working operation, the result of theresidual stress of the welded pipe's residual stress is significant for theresidual stress's elimination．For Jinzhou GroupФ219mm tube as anexample, To make use of APDL language embedded in ANSYS, we canestablish the finite element model of high-frequency welded pipe, then thelinear thermal source model was used to conduct the computation,simultaneously the finite element model of high-frequency welded pipe'sthermal boundary conditions and the physical structure of the constraintsare also taken into account, above on all of these we can obtain the stressfield and displacement field of three-dimensional for the high-frequencypipe's welding process．From the analysis on results of the finite elementsimulation, we can derive the stress field and displacement field of thewelded tube ahead of the stress relief process in theory．Third, The transport of industrial chemicals is the key link for chemical production, usually, the transit of industrial chemicals is used bywelded pipe. The affordable of temperature difference in the inside andoutside welded pipe walls is an important indicator for the evaluation of thequality of welded pipe. For Jinzhou GroupФ219mm tube as an example aswell, we also based on the ANSYS finite element, to make up the APDLprogram, comparing the uniform temperature of the pipe walls and thetemperature difference of the inside and outside welded pipe walls whichthe high-frequency weld pipe and V-groove weld pipe can bearable. We canconclude that the bearable of temperature difference and the uniformtemperature in inside and outside walls for the high-frequency weld pipe areboth greater than the Vee groove weld pipe.Through research of the three aspects above, we can take a further stepto improve the quality of high-frequency welded pipe theoretically. And italso provides reference in the selection of weld pipes.