摘要
The thermal modeling of underwater friction stir welding （FSW） was conddcted with a three-dimensional heat transfer model. The vaporizing characteristics of water were analyzed to illuminate the boundary conditions of underwater FSW. Temperature dependent properties of the material were considered for the modeling. FSW experiments were carried out to validate the calculated results, and the calculated results showed good agreement with the experimental results. The results indicate that the maximum peak temperature of underwater joint is significantly lower than that of normal joint, although the surface heat flux of shoulder during the underwater FSW is higher than that during normal FSW. For underwater joint, the high-temperature distributing area is dramatically narrowed and the welding thermal cycles in different zones are effectively controlled in contrast to the normal joint.
应用三维热源模型对水浸搅拌摩擦焊接的温度场进行模拟分析。通过分析水介质的汽化特征,阐明水浸搅拌摩擦焊接的边界条件。在模拟中考虑了材料性能与温度的相关性。搅拌摩擦焊接试验的结果表明,模拟结果与温度场的真实值具有较高的拟合程度。温度场的模拟结果表明,尽管水浸搅拌摩擦焊接的轴肩面热流密度比常规搅拌摩擦焊接的高,但水浸接头的最高峰值温度明显比常规接头的低。水浸接头的高温分布区间显著变窄,焊缝各区热循环也得到了有效控制。
基金
Project(2010CB731704) supported by the National Basic Research Progiam of China
Project(51175117) supported by the National Natural Science Foundation of China
Project(2010ZX04007-011) supported by the National Science and Technology Major Project of China
