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所属单位：材料科学与技术学院
发表刊物：MATERIALS RESEARCH EXPRESS
关键字：TA15 titanium alloy porosity formation microstructure laser welding
摘要：The laser welding of 5 mm thick TA15 titanium alloy was realized by fiber laser of IPG YLS-6000. The microstructure and porosity formation mechanism of the welded joints were investigated under different welding conditions. The microstructure and porosity of welded joints were observed using optical microscope and energy dispersive spectrometer (EDS), respectively. Moreover, the influencing mechanisms of porosity formation and evolution induced by metallurgical and instability of keyhole were also discussed. The experimental results indicated that the outline of metallurgical porosity is regular, which is mainly caused by the absorption of water from the outside environment into the molten pool and the evaporation of Al element. Fast welding speed contributes to the keyhole fluctuating sharply or even collapsing, which causes the shielding gas to enter the molten pool and further form bubbles. The fundamental reason for the formation of porosity is that the laser welding speed is so fast that the molten pool cooling speed is high, which makes it difficult for dissolved gas to escape sufficiently and finally form porosities. It lays foundation for understanding the formation mechanism of porosity and optimizing the process for laser welding of TA15 titanium alloy.
ISSN号：2053-1591
是否译文：否
发表时间：2019-07-01
合写作者：颜廷艳,高奇玉,朱振新,卜珩倡,王正东
通讯作者：占小红