Microstructural characteristics and mechanical properties in laser beam welds of Ti6Al4V alloy

Liu, H.; Nakata, Kohei; Yamamoto, Norifumi; Liao, Jinsun

doi:10.1007/s10853-011-5931-8

Cited by 49 publications

(22 citation statements)

References 19 publications

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“…These are strongly influenced by the welding conditions (Liu et al, 2012). LBW is one of the most efficient joining techniques, due to its flexibility, precision and capability to produce restricted HAZ and deep penetration (Casalino et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Kalaiselvan¹,

Elango²,

Nagarajan³

2017

IJASMM

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Laser beam welding produces good quality welds with minimum shrinkage for sheet metal joints. The quality of welded joint depends upon surface morphology, hardness, mixing of liquid phases and metallurgical non-homogeneity induced by gradients of temperatures and cooling rate at the weld interface. In the present investigation, Titanium Grade5 (Ti) and AA2024 (Al) alloy dissimilar sheet metals are joined using Nd:YAG pulsed laser beam and the effect of welding speed on crack tendencies, the strength of weldment based on hardness and composition changes are studied. Test results reveal that higher welding speed eliminates cracks in weldment and improves surface morphology. From hardness test, it is observed that the strength of fusion zone is considerably improved at higher weld speed and the findings are supported by SEM and EDS studies.Keywords: laser beam welding; LBW; morphology; hardness; microstructure; composition.Reference to this paper should be made as follows: Kalaiselvan, K., Elango, A. and Nagarajan, N.M. (2017) N.M. Nagarajan is a retired Professor from National Institute of Technology, Calicut, Kerala, India. His current research deals with powder metallurgy, metal joining, foundry and control of welding processes. He has authored and co-authored more than 100 technical papers.

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Section: Introductionmentioning

confidence: 99%

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Kalaiselvan¹,

Elango²,

Nagarajan³

2017

IJASMM

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“…The conclusion was that "the best value of defocusing was -4 mm" since less undercut and penetrated area, and heightened penetration, as well as reduced grain size were observed in this setup. Further studies on the mechanical properties of these welds revealed that, in the heat affected zone, there was a variation in microstructure observed [59]. In the heat affected zone, as well as the fusion zone, martensite was discovered, and thus the strengthening in these zones was attributed to this discovery.…”

Section: Laser Weldingmentioning

confidence: 93%

Enhancing the Properties of Ti6Al4V as a Biomedical Material: A Review

Annamalai¹,

Kavitha²,

Ramji³

2014

TOMSJ

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Abstract:The alloy Ti 6 Al 4 V has evolved as a good biomedical material, by virtue of its bio-compatibility. In order to make implants out of this material, it has to be shaped and processed. Shaping this material by conventional manufacturing methods like machining, welding and brazing presents a huge challenge. This challenge has been met by various approaches like additive manufacturing, surface alloying and heat treatment. Additive manufacturing processes are used for shaping; coatings and surface alloying are used for property improvement; heat treatment is used for improving the machinability. The processing method has an impact on the final properties of the product. This review attempts to trace the development of methods and practices for converting Ti 6 Al 4 V into a useful material for biomedical applications.

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“…Additionally, it has been reported that strengthening in the HAZ and fusion zone is attributed to substructure in the grain in the LBW of pure titanium. 9) The grain boundary maps of the various regions in the weld obtained at the same condition are shown in Fig. 9.…”

Section: Strengthening Mechanism In Hybrid Weldmentioning

confidence: 99%

“…It has been reported that the relatively high hardness is detected when indenting into the basal plane, whereas the low hardness is found when indenting into the prismatic plane, in measuring the hardness of such metals having the hexagonal close packed structure as pure titanium. 9,22,23) For the above reasons, the scatters in the hardness distributions occurred in the HAZ and WM of hybrid welded joint.…”

Section: Strengthening Mechanism In Hybrid Weldmentioning

confidence: 99%

Formation of One Pass Fully-Penetrated Weld Bead of Titanium Plate by Fiber Laser and MIG Arc Hybrid Welding

Murakami

Nakata

Yamamoto³

et al. 2012

Mater. Trans.

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A hybrid welding of high power fiber laser and pulsed metal inert gas (MIG) arc was applied to titanium plate with 6 mm in thickness, and the optimum welding condition to make fully penetrated weld bead as well as the metallurgical and mechanical properties of the welded joint were evaluated. It is found that sound one pass fully penetrated square-groove butt joints without any weld defect can be made by optimizing the welding conditions mainly welding speed, arc current, laser power and laser focus position. The hardness and tensile tests indicate that heat affected zone and weld metal are stronger than base metal. It is considered that the strengthening is attributed to the increment of chemical compositions and substructures.

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Microstructural characteristics and mechanical properties in laser beam welds of Ti6Al4V alloy

Cited by 49 publications

References 19 publications

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Enhancing the Properties of Ti6Al4V as a Biomedical Material: A Review

Formation of One Pass Fully-Penetrated Weld Bead of Titanium Plate by Fiber Laser and MIG Arc Hybrid Welding

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