Parametric optimisation and microstructural analysis on high power Yb-fibre laser welding of Ti–6Al–4V

Ahn, Joseph; Chen, L.; Davies, Catrin M.; Dear, John P.

doi:10.1016/j.optlaseng.2016.06.002

Cited by 61 publications

(17 citation statements)

References 31 publications

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“…All Ti-6Al-4V welding trials were autogenous. The optimum welding parameters as listed in Table 2 were chosen based on the work by Ahn et al [11]. …”

Section: Fibre Laser Weldingmentioning

confidence: 99%

Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation

et al. 2017

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“…All Ti-6Al-4V welding trials were autogenous. The optimum welding parameters as listed in Table 2 were chosen based on the work by Ahn et al [11]. …”

Section: Fibre Laser Weldingmentioning

confidence: 99%

Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation

et al. 2017

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“…As a result, it had very limited use for fusion welding applications especially in any stress environment. Fibre laser welds have become attractive alternatives to existing CO2 and Nd:YAG laser welds due to their higher laser efficiency, superior beam quality, lower maintenance, reduced cooling requirements, smaller footprint and more compact design [2]. While extensive research has been conducted on fibre laser welding of fusion weldable 5xxx, 6xxx and 7xxx series aluminium alloys over the last 20 years, little has been reported on the weldability of AA 2024-T3.…”

Section: Introductionmentioning

confidence: 99%

The effect of Ar and He shielding gas on fibre laser weld shape and microstructure in AA 2024-T3

Ahn

Chen

et al. 2017

Journal of Manufacturing Processes

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“…Especially, the relationship between heat input and porosity defect has been ignored and remains to be identified. It has been frequently reported that a large welding heat input enhances flotation and removal of bubbles in the molten pool and thereby reduces the porosity defects [26,27,28]. However, some studies indicated that the use of a large heat input cannot guarantee a reduction in porosity defects in Mo alloy welds prepared by powder metallurgy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Porosity Defects in a Fiber Laser Welded Socket-Joint Made of Powder Metallurgy Molybdenum Alloy

Xie

Shang

et al. 2019

Materials

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Porosity defects are still a challenging issue in the fusion welding of molybdenum and its alloys due to the pre-existing interior defects associated with the powder metallurgy process. Fiber laser welding of end plug and cladding tube made of nanostructured high-strength molybdenum (NS-Mo) alloy was performed in this work with an emphasis on the role of welding heat input. The distribution and morphology of porosity defects in the welded joints were examined by computed tomography (CT) and scanning electron microscopy (SEM). Preliminary results showed that laser welding of NS-Mo under low heat input significantly reduced the porosity defects in the fusion zone. The results of computed tomography (CT) showed that when the welding heat input decreased from 3600 J/cm (i.e., 1200 W, 0.2 m/min) to 250 J/cm (i.e., 2500 W, 6 m/min), the porosity ratio of the NS-Mo joints declined from 10.7% to 2.1%. Notable porosity defects under high heat input were related to the instability of the keyhole, expansion and the merging of bubbles in the molten pool, among which the instability of the keyhole played the dominant role. The porous defects at low heat input were generated as bubbles released from the powder metallurgy base metal (BM) did not have enough time to overflow and escape.

show abstract

Parametric optimisation and microstructural analysis on high power Yb-fibre laser welding of Ti–6Al–4V

Cited by 61 publications

References 31 publications

Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation

Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation

The effect of Ar and He shielding gas on fibre laser weld shape and microstructure in AA 2024-T3

Effect of Heat Input on Porosity Defects in a Fiber Laser Welded Socket-Joint Made of Powder Metallurgy Molybdenum Alloy

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