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    Review of 'Laser Butt Welding of Thin Ti6Al4V Sheets: Effects of Welding Parameters'

    Laser Butt Welding of Thin Ti6Al4V Sheets: Effects of Welding ParametersCrossref
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    Laser Butt Welding of Thin Ti6Al4V Sheets: Effects of Welding Parameters

    Titanium and its alloys, particularly Ti6Al4V, which is widely utilized in the marine and aerospace industries, have played a vital role in different manufacturing industries. An efficient and cost-effective way of joining this metal is by laser welding. The effect of laser power and welding speed on the tensile, microhardness, and microstructure of Ti6Al4V alloy is investigated in this paper. Results show that the microhardness is highest at the fusion zone and reduces towards the base metal. The microstructure at the fusion zone shows a transformed needle-like lamellar α phase, with a martensitic α’ phase observed within the heat affected zone. Results of tensile tests show an improved tensile strength compared to the base metal.

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      • Laser welding is suitable for the joining of the Ti and its alloys due to the cost-effectiveness and the desired mechanical properties, and microstructures. In this work, the laser welding of thin Ti6Al4V sheets has been studied. The effective parameters to achieve a full penetration (the desired issue), fracture toughness and suitable hardness have been investigated. The welding parameters influencing on the microstructural phases that developed into fusion zone and HAZ. Therefore, the effect of the laser welding parameters on the mechanical and microstructral aspects have been studied. The proper welding parameters were determined by examine the effect of weld power and welding speed on 1 mm thickness of Ti6A14V sheets. Taguchi design analysis has been used to design the experiments   by determining the laser power (kW), and welding speed (m/min).
      • Microhardenss is high at the fusion zone. The distribution of hardness is similar to that for spot welding. Hence, fusion zone hardness is higher than the hardness in base metal due to some phase’s element. Accordingly, the tensile strength for the weld area is higher than the base metal.
      • Laser welding is one of the most used fusion processes. It can produce a fine grain size and narrower HAZ as compared with others processes such as TIG welding. Nevertheless, the welding speed and input power could produce a coarse grain size and detrimental microstructures. Traditionally, the coarse grains are detrimental to the fracture
      • Welding parameters have been determined by their effect on the mechanical and microstructural properties of Ti6A14V. It was found that the increasing of welding speed will produce Alpha-Martensite. Hence, increasing the hardness in the weld zone.
      • The welding speed has an effect on the martensite formation within the weld zone (hardness increasing).
      • Some studies mentioned that the appropriate parameters when the full penetration is obtained. The high power with low welding speed will cause instability in the weld fusion, excessive melting, and defects. In other side, low power input with high welding speed will cause a lack of penetration.
      • The microstructres and microhardness of fusion zone, HAZ, and base metal was captured, as well as the fractured surface was examined.
      • SEM was used to examine the fracture surface. Therefore, the plastic deformation, and inclusion have been defined.


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