Induction heating and extrusion forming process of high frequency straight seam welded pipe
At present,most welding pipe factories in China in the production and processing process,long-term rely on operators to observe the state of EDM and weld burr morphology and other macro physical characteristics to adjust the welding production related process parameters,but rely on human eye observation method error is large,lack of quantitative,scientific theoretical guidance,prone to cold welding or over burning and other quality defects.The induction heating model and extrusion forming model of the straight seam welded pipe were established,and the distribution of temperature field and stress field in the induction welding process of the welded pipe was obtained by numerical simulation,as well as the evolution of the burr morphology of the welded pipe,and the relationship between the change of the macroscopic morphology characteristics of the welded burr forming and the electrical and geometric parameters was revealed.The metal streamline Angle is used as the evaluation standard of welding qual-ity,and the aspect ratio of welding burr is introduced as the characteristic value to describe the internal relationship between the height and width of burr.The influence of different welding parameters on the macroscopic morphology of welding burr forming was analyzed one by one by using the control variable method.It was found that the charac-teristic values of metal streamline Angle and aspect ratio increased with the increase of extrusion amount,welding speed and coil distance,and decreased with the increase of current frequency and current size.Finally,relevant experiments on metal flow line distribution during welding were carried out,and the numerical simulation results were compared with the experimental results.The results showed that the error between the metal flow line Angle obtained by numerical simulation and the experimental value was less than 4°,and the metal flow line Angle between the two tended to be consistent with the change of the extrusion amount in the welding process,which verified the rationality of the simulation results.The research results in this paper provide a theoretical reference for further opti-mization of welding parameters of high-frequency steel pipe.
high frequency weldingwelded pipeextrusion formingweld burrmetal streamline
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