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Numerical Simulation of Temperature Field and Stress Field of Ti/Steel Dissimilar Metal Duiing Electron Beam Welding

Author: DuanZuoHui
Tutor: FengJiCai
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Numerical Simulation Electron beam welding Dissimilar metals Temperature field Stress field
CLC: TG456.3
Type: Master's thesis
Year: 2011
Downloads: 108
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Abstract


ANSYS finite element analysis software , the finite element model of the titanium / steel butt joints . On this basis , were directly butt and preset fill layer titanium titanium alloy TA15 with 304 stainless steel / steel electron beam welding two cases of temperature field and stress field of numerical simulation . And experimental verification of the accuracy of the results . Indirect butt two cases under the direct butt welding of titanium alloy TA15 with 304 stainless steel and preset fill layer temperature field characteristics of the simulation study , the characteristics of both temperature field is basically consistent , both small molten pool heating rate fast. And both sides of the temperature distribution asymmetry , the same time , both sides away from the weld the same distance from the node to reach the peak temperature gap . Compare the results of both the temperature field , found that add a fill layer , the peak temperature of the molten pool significantly reduced , and also significantly reduce the temperature gradient on both sides , the joint performance benefit . Heat cycle curve , the two joints to verify the accuracy of the results of measurement , the calculated and measured values ??are in good agreement . Of different thickness of the filling layer , the melting characteristics of the electron beam welding of different partial beam position heat acting under a preset filling layer of titanium / steel . Found that with the increase in the thickness of the filling layer , both sides of the weld width is reduced , but the titanium side of the weld width is always larger than the steel side , and the thickness of the filling layer is not more than 0.7mm . With the position of the deflector is shifted to the steel side , titanium side weld width is reduced , and the steel side increases , but the position of the deflector should be controlled to be varied between the bonding surface of the both sides of the metal and the filling layer . Finally , thermal - structural coupling analysis method , the stress field before and after adding the filling layer joints were calculated and analyzed . Found that the distribution of stress field before and after adding the filling layer is basically the same , the weld zone longitudinal residual stress is tensile stress , transverse residual stress is compressive stress , and the stress field distribution asymmetry , the weld zone is mainly located in the weld the migraine steel side longitudinal tensile stress . Comparing the results of the residual stress of a both found that adding the peak stress in the filler layer is significantly reduced, and the stress distribution is more uniform . Cutting method preset with the filling layer of titanium / steel joints longitudinal residual stress measurement , the measurement results is smaller than the calculated results , but the trend is consistent .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Special welding > Vacuum electron beam welding
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