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单一金属结构通常很难满足工业生产的需求,而异种材料的焊接结构能够兼有两种材料的优点,能最大限度的降低成本和提升结构性能。在航空航天发动机制造中常采用异种金属的组合结构来保证其冷却高强与轻量化的综合性能。异种金属焊接一直是焊接领域的热点与难点之一。异种金属间的热物理性能与化学结晶性能的差异导致其焊接冶金相容性差,易在接头处萌生裂纹,弱化了焊接接头性能。基于异种金属的冶金特点和焊接结构特征,通常采用钎焊及固相连接的方法来解决异种金属的连接问题。目前,异种金属的熔焊连接
A single metal structure is often difficult to meet the needs of industrial production, and dissimilar materials welded structure can combine the advantages of both materials, to minimize costs and improve structural performance. In the aerospace engine manufacturing often use a combination of dissimilar metals to ensure that the combination of high-strength cooling and lightweight overall performance. Dissimilar metal welding has been one of the hot spots and difficulties in the field of welding. Differences between thermophysical properties and chemical crystallization properties of dissimilar metals lead to poor compatibility of welding metallurgy, easy initiation of cracks at joints and weakening of weld joint properties. Based on the metallurgical characteristics of dissimilar metals and the structural features of the welding structure, soldering and solid phase connection methods are usually used to solve the problem of dissimilar metal connection. At present, dissimilar metals welded connection