Heat Source Model and Temperature Field Simulation for Inclined Electron Beam Welding of High-strength Steel
The work aims to propose a surface and body composite heat source model for inclined electron beam welding,so as to explore the effects of the tilt angle of the electron beam on temperature field.Based on the Gaussian distribution of elec-tron beam energy and the principle that the maximum power density of each layer was equal in the thickness direction of the welded part,a surface heat source of elliptic Gaussian distribution and a an inclined ellipsoidal cone heat source of elliptic Gaussian distribution were established.The parametric relation between the heat source models for inclined and vertical electron beam welding under the same process was established through deduction.The parameters of inclined heat source were obtained indirectly through vertical welding experiments.On the basis of checking the heat source model of electron beam vertical weld-ing,the electron beam inclined welding of high strength steel plates was studied deeply.It was shown that,compared with verti-cal welding at the same process parameters,when the angle increased to 30°,the maximum temperature increased by about 5.6％,the melting depth decreased by about 17.14％,and the length of the molten pool increased by about 11.11％.The maxi-mum temperature gradient in front of the molten pool decreased by about 7.2％,while the temperature gradient at the upper part of the rear of the molten pool did not change much,and increased by about 12.6％at the lower part.For the same process pa-rameters,as the inclination angle of the electron beam increases,the inclination angle of the melt pool increases,the maximum temperature of the melt pool increases,the length and width of the melt pool increase,and the depth of the melt pool decreases.These result that the higher the inclination angle is,the more the temperature gradient in the direction of the thickness of the weldment will increase.The maximum temperature gradient decreases in front of the molten pool and increases in the lower part of the back of the molten pool.
electron beam inclined weldingheat source modeltemperature fieldelliptic gaussian distributionnumerical simulation
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维普
