Be/Al激光焊接缺陷的研究  

Defects in Be/Al Laser Welding

作　　者：郝国建[1] 林志[1] 林均品[1] 王艳丽[1] 陈国良[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2005年第10期1588-1591,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(10176002)

摘　　要：通过实验手段并改变激光焊接参数对Be/Al激光焊接缺陷的起因进行研究。实验分别采用热传导焊和深熔焊两种焊接模式制备样品。结果表明:激光焊接裂纹主要产生于热传导焊焊件的熔合区根部,其产生是热应力、焊件根部形状和杂质偏析共同作用的结果;而气孔主要出现在深熔焊焊接的焊件中;缺陷的种类和焊接参数有很大的关系。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.

关 键 词：焊接裂纹 Be/Al ND:YAG激光焊接 偏析 

分 类 号：TG456.7[金属学及工艺—焊接]