难熔金属焊接温度场数值模拟及焊接影响因素研究

Numerical Simulation of Welding Temperature Field of Refractory Metal and Analysis of Welding Influencing Factors

为了研究异种金属焊接温度场的影响因素,以TC4合金与MoRe47%合金为研究对象,在现有电子束焊接数学模拟研究的基础之上,使用计算流体力学商业软件Fluent进行模拟,改变电子束光斑位置、电子束焊接移动速度和电子束电流的大小,探究焊接过程温度场的分布特性,并将数值模拟结果与焊接试件真实形貌进行了对比分析。研究结果表明,通过改变电子束光斑位置,发现焊接光斑向MoRe47%合金侧偏移将有助于熔池的形成;通过改变电子束移动速度,发现当电子束移动速度为9 mm/s时焊接质量最好,移动速度越快,焊接温度越低;通过改变电子束电流大小,发现当电子束电流为7 mA时焊接质量最好,随着电流减小,焊接温度随之降低;通过数值模拟与实验对比发现,数值模拟计算所得熔池略大于实际熔池,但二者在形貌方面高度一致,同时也验证了所选热源模型的准确性。

In order to study the influence factors of dissimilar metals welding temperature field,this study takes the TC4 alloy with MoRe47%alloy as the research object.On the basis of existing electron beam welding of mathematical simulation,computational fluid dynamics commercial software Fluent is used.To change the electron beam spot position,electron beam welding speed and the size of the electron beam current,it tends to explore the distribution characteristics of temperature field in welding process,and the numerical simulation results and the welded specimen comparison and analysis the real morphology.The results show that by changing the spot position of the electron beam,it is found that the welding spot deviation to the side of more47%alloy will contribute to the formation of weld pool.By changing the moving speed of the electron beam,when the moving speed of the electron beam was 9mm/s,the welding quality was the best,and the faster the moving speed was,the lower the welding temperature was.By changing the electron beam current,the welding quality is the best when the electron beam current is 7mA.Through the comparison between numerical simulation and experiment,it is found that the molten pool calculated by numerical simulation is slightly larger than the actual molten pool,but the two pools are highly consistent in morphology,and the accuracy of the selected heat source model is also verified.