钛合金Ti-6Al-4V ELI厚板多层多道焊试验与数值模拟

Experimental and Numerical Simulation on Multi-Layer and Multi-Pass Welding of Titanium Alloy Ti-6Al-4V ELI Thick Plates

对2块厚度为24 mm的Ti-6Al-4V ELI厚板进行夹角为171.98°的多层TIG焊接试验,基于SYSWELD软件平台,在焊板两端完全刚性固定的装夹条件下数值模拟计算焊接温度场、应力场和焊接引起的变形。计算结果表明,焊接温度场的变化规律符合实际,焊缝区的拉伸残余应力最大,热影响区的压缩残余应力较大。焊接数值模拟得到的残余应力场与试验测量值能较好地吻合,验证了数值模拟模型的准确性。该数值模拟方法可应用到大深度Ti-6Al-4V ELI载人舱强度计算中的焊缝残余应力模拟中。

The multi-layer TIG welding experiment for two Ti-6Al-6V ELI plates with thickness of 24 mm and angle of 171.98°is conducted.Based on the SYSWELD software platform,the deformation caused by welding temperature field,stress field and welding is calculated by numerical simulation under fully rigid fixed clamping conditions of the two ends of the welding plate.The calculation results show that the changing tendency of temperature field is in line with the actual one;the tensile residual stress at the welding zone is the largest;the residual compression stress field at heat affected zone is relatively large.The residual stress field from the numerical simulation agrees well with the measured value from the experiment,which verifies the accuracy of the numerical simulation model.The numerical simulation method can be applied to the simulation of welding residual stress in the strength calculation of deep-sea Ti-6Al-4V ELI manned cabins.