Effect of joint gap on the quality of laser beam welded near-β Ti-5553 alloy with the addition of Ti–6Al–4V filler wire

作者: T. Shariff , X. Cao , R. R. Chromik , P. Wanjara , J. Cuddy

DOI: 10.1007/S10853-011-5866-0

关键词: AlloyOrthorhombic crystal systemJoint (geology)Flip chipMicrostructureMaterials scienceMetallurgyPorosityMartensiteWeldingComposite material

摘要: Ti–5Al–5V–5Mo–3Cr (Ti-5553) sheets were welded using a Nd: YAG laser system and Ti–6Al–4V filler wire. The effect of joint gap on weld geometry, defects, microstructure, hardness was investigated. Fully penetrated welds up to 0.5 mm produced. two main defects observed porosity underfill. addition wire reduced underfill but increased porosity, especially at large gaps. fusion zone (FZ) microstructure low gaps consisted retained β with dendritic morphology. At 0.3 mm, regions orthorhombic α″ martensite in the which proportion as from volume percentage 4.9% 44% mm. Despite differences increasing gap, FZ remained relatively constant for all evaluated.

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