中文摘要：

利用有限元法对不同操作条件下的钎焊板翅结构残余应力进行分析。计算结果表明，成型后的板翅结构单元中存在较大的残余应力，最大残余应力出现在钎角附近。钎焊过程中的固化急速冷却速度对钎焊残余应力有显著影响。急速冷却速度越快，越有利于材料性能的提升，但是钎角附近的残余拉伸应力也越本。另外，采用加压组装工艺可在钎焊后的板翅结构中产生残余压应力，有效提高了钎焊板翅结构的服役安全和寿命。

英文摘要：

The residual stress inside the plate-fin structure has been analyzed by the finite element method under different operation conditions. The calculated results show that a large scale of residual stress will occur in the plate-fin structure and the maximum value is found at the braze comer. The rapid cooling process and the pressured assembly technology have a significant effect on the distribution of the residual stress. The brazed material owns a better performance with a quicker cooling rate. However, the quicker cooling rate also leads to a tensile residual stress near the brazed seam, which is deleterious to the whole structure. The pressure assembly technology can change the residual stress from a tensile state to the compressed state which can improve the safety and extend the service life of the plate-fin structure effectively.