论文部分内容阅读
利用有限元法(FEM)对双椭球热源的移动焊接温度场进行数值模拟,通过分析焊接过程中的传热学行为,研究了不同焊接条件(包括板厚、热输入、预热温度)对焊接热影响区冷速(t8/5)的影响。通过对比分析FEM与传热学公式计算结果,确定了中厚板的临界板厚条件,采用多项式回归法建立了中厚板t8/5的数值预测公式,并讨论其对预热温度的适用范围。焊接试验采用相同的焊接参数进行,温度热循环及组织的比较结果表明,数值预测结果与实验结果吻合的较好。
The finite element method (FEM) was used to simulate the moving welding temperature field of the dual ellipsoidal heat source. By analyzing the heat transfer behavior in the welding process, the effects of different welding conditions (including plate thickness, heat input and preheating temperature) Effect of cooling rate on weld HAZ (t8 / 5). Through comparative analysis of the results of FEM and heat transfer formula, the critical plate thickness of plate was determined, and the numerical prediction formula of plate t8 / 5 was established by using the polynomial regression method. The applicable range of preheat temperature . Welding test using the same welding parameters, temperature thermal cycling and the results of the comparison show that the numerical prediction results are in good agreement with the experimental results.