(中国船舶重工集团公司，洛阳 471039)
摘 要: 基于热−力耦合的焊接热弹塑性有限元法，建立运动电弧作用下的二维体热源模型。采用“生死单元”技术实现焊缝的顺序生长来完成温度场的计算；选择平面应变模型，计算大厚度多道焊接的残余应力，最终得到钛合金厚板焊接过程温度场和应力场分布以及厚板焊接接头的三维应力的分布规律，并与钛合金厚板应力测试结果进行对比验证，两者很接近。该研究结果为钛合金厚板焊接接头残余应力的研究提供了参考。
关键字: 钛合金；厚板；焊接接头；三维应力；热力耦合
titanium alloy heavy plate of narrow gap welded joint
（Luoyang Ship Material Research Institute, Luoyang 471039, China）
Abstract:Two dimension conical heat source model was established using two-dimension thermal-mechanical coupled simulations based on the hot-elastoplastic finite element method under moving arc. “Live-die unit” technology was adopted to simulate growth of welding line and finfish the calculation of temperature field. According to choosing the plane strain model, the residual stress of multipass welding on thick titanium alloy can be counted. The distribution of temperature field, the residual field and three-dimension stress of welding joint about thick plate all could be gotten. Compared with the testing results of thick titanium plate, it can be found that one is approaching another. This results provide reference to study residual stress of welding joint for thick titanium plate.
Key words: titanium alloy; heavy plate; weld joint; three dimensional stress; thermal-mechanical coupled
