An investigation was conducted to determine the causes of weld defects in laser Be/Al weldments. In agreement with earlier studies, features on the fracture surfaces consistent with hot shortness cracking were observed. In this paper, conduction mode welds and keyhole mode welds were used to produce specimens. Closer examination of the fusion zone crack regions reveals the cracking is a result of thermal stress, shape of welds root and impurities segregation. The defects type relate to the weld parameters, the cracks nucleate easily at conduction mode weld, and the blowholes appear easily in keyhole mode weld.
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郝國建 林志 林均品 王艷麗 陳國良. Be／Al激光焊接缺陷的研究[J].稀有金屬材料與工程,2005,34(10):1588~1591.[Hao Guojian, Lin Zhi, Lin Junpin, Wang Yanli, Chen Guoliang. Defects in Be/Ai Laser Welding[J]. Rare Metal Materials and Engineering,2005,34(10):1588~1591.] DOI：[doi]