Development of thermo conductive analysis simulation in order to aid laser welding of dissimilar metals

开发热传导分析模拟以辅助异种金属的激光焊接

• 批准号: 13650774
• 负责人: MUTOH Yoshiharu
• 金额: $ 1.86万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650774/
• 关键词: Dissimilar metals joint; Laser welding; Non steady thermo conductive analysis; Simulation; Welding condition; レーザー溶接

Steel and aluminum alloy were chosen as a combination of dissimilar metals in this study. Boundary element analysis program was developed. Laser welding condition was obtained by the analysis, assuming of solid state / liquid state reaction at the interface. A joint between steel and aluminum alloy was welded under the condition predicted by BEM analysis. Intermetallic phase between Fe and Al was formed at the interface of the joint. Strength of the joint was controlled by this intermetallic phase, because this phase has poor mechanical properties. Even if brittle reaction layer exists at the interface, increase of bonded area could be a way to improve failure load of the joint. According to BEM analysis, change of shape of joint part and/or applying contact pad at welding zone can control temperature distribution at the interface and increase bonded area. In this case also, the welding condition was predicted by BEM analysis. Increase of failure load of joint and bonded area was recognized by tensile test and cross-sectional observation at the interface. The BEM simulation with assumption of interface state as mentioned above also predicted the size of bonded area. In conclusion, the computer aiding method for dissimilar metals laser welding was developed and its availability was shown in this study.

在本研究中，选择钢和铝合金作为不同金属的组合。开发了边界元素分析程序。假设界面处的固态 /液态反应，则通过分析获得激光焊接条件。在BEM分析预测的条件下焊接了钢和铝合金之间的关节。 Fe和Al之间的金属相在关节的界面形成。关节的强度由这个金属间相控制，因为该相具有较差的机械性能。即使在界面处存在脆性反应层，粘结面积的增加也可能是提高关节故障负荷的一种方法。根据BEM分析，关节部分的形状和/或在焊接区应用接触板的变化可以控制界面处的温度分布并增加粘结面积。在这种情况下，通过BEM分析预测了焊接条件。通过拉伸测试和界面上的横截面观察确认关节和粘结面积的破坏负荷增加。如上所述，带有界面状态的假设的BEM模拟也预测了粘结面积的大小。总之，开发了计算机辅助方法激光焊接，并在本研究中显示了其可用性。