Browsing by Author "Pardal, Goncalo"

Browsing by Author "Pardal, Goncalo"

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  • Comparison of continuous and pulsed wave lasers in keyhole welding of stainless‑steel to aluminium 
    Coroado, Julio; Ganguly, Supriyo; Williams, Stewart; Suder, Wojciech; Meco, Sonia; Pardal, Goncalo (Springer, 2021-10-31)
    A continuous wave (CW) and a nanosecond pulsed wave (PW) lasers were used to join 1-mm thick sheets of SS304L (SS) austenitic stainless-steel to AA5251 (Al) aluminium alloy in an overlap joint configuration. The weld shape ...
  • Dissimilar metal joining of stainless steel and titanium using copper as transition metal 
    Pardal, Goncalo; Ganguly, Supriyo; Williams, Stewart W.; Vaja, Jay (Springer, 2016-01)
    Joining of stainless steel and titanium dissimilar metal combination has a specific interest in the nuclear industry. Due to the metallurgical incompatibility, it has been very difficult to produce reliable joints between ...
  • Effect of shielding conditions on bead profile and melting behaviour in laser powder bed fusion additive manufacturing 
    Caballero, Armando; Suder, Wojciech; Chen, Xin; Pardal, Goncalo; Williams, Stewart W. (Elsevier, 2020-05-26)
    A series of experiments were performed using a 500 W continuous wave fibre laser on a single powder bed layer using different processing variables. The aim was to investigate the effect of different shielding conditions ...
  • Fabrication of functionalised surfaces on gum metal (Ti-30Nb) using micromachining 
    Hawi, Sara; Dickins, Andrew; Pardal, Goncalo; Giusca, Claudiu; Pearce, Oliver; Goel, Saurav (euspen, 2019-06-30)
    Structured surfaces are attracting deep interest, as they allow tailoring the functionality via changes in the surface topography. Applications for these surfaces range greatly, including, optical surfaces for antireflective ...
  • In-process mechanical working of additive manufactured Rene 41 
    James, William Sean; Ganguly, Supriyo; Pardal, Goncalo (American Society of Mechanical Engineers, 2023-01-18)
    In developing the wire + arc additive manufacturing (WAAM) process for creep resistant alloys for defence applications, structures were built from nickel-based superalloy Rene 41 (RE41). The performance of the additive ...
  • Investigation of dissimilar metal welds by energy-resolved neutron imaging 
    Tresmin, Anton S.; Ganguly, Supriyo; Meco, Sonia; Pardal, Goncalo; Shinohara, Takenao; Feller, Bruce (International Union of Crystallography, 2016-06-09)
    A nondestructive study of the internal structure and compositional gradient of dissimilar metal-alloy welds through energy-resolved neutron imaging is described in this paper. The ability of neutrons to penetrate thick ...
  • Laser spot welding of laser textured steel to aluminium 
    Pardal, Goncalo; Meco, Sonia; Dunn, Andrew; Williams, Stewart W.; Ganguly, Supriyo; Hand, Duncan P.; Wlodarczyk, Krystian L. (Elsevier, 2017-03)
    Laser welding of dissimilar metals (steel and aluminium) was investigated with the aim to increase the maximum tensile shear load of the Fe-Al joints. The increase was achieved by texturing the surface of steel prior to ...
  • Laser stabilization of GMAW additive manufacturing of Ti-6Al-4V components 
    Pardal, Goncalo; Martina, Filomeno; Williams, Stewart W. (Elsevier, 2019-04-26)
    GMAW (Gas Metal Arc Welding) of titanium is not currently used in industry due to the high levels of spatter generation, the wandering of the welding arc and the consequent waviness of the weld bead. This paper reports on ...
  • Microstructure and mechanical properties of Inconel 718 and Inconel 625 produced through the wire + arc additive manufacturing process 
    James, William Sean; Ganguly, Supriyo; Pardal, Goncalo (NATO, 2022-03-05)
    In developing the wire + arc additive manufacturing (WAAM) process for heat and creep resistant alloys, structures were built from nickel-based superalloys Inconel 718 (IN718) and Inconel 625 (IN625). In this paper, wall ...
  • New phenomenological model for comparison of lasers with different temporal outputs 
    Coroado, Julio; Williams, Stewart W.; Suder, Wojciech; Ganguly, Supriyo; Meco, Sonia; Pardal, Goncalo (Springer, 2022-04-06)
    Laser welding is distinguished by low heat input, low distortion, high travel speeds and accuracy. Traditional high-power pulsed wave (PW) lasers are being replaced by high-frequency low-pulse energy fibre lasers. However, ...
  • A performance comparison of additive manufactured creep-resistant superalloys 
    James, William Sean; Ganguly, Supriyo; Pardal, Goncalo (Taylor and Francis, 2023-03-13)
    Creep-resistant nickel, cobalt based superalloys, selected for a high-speed flight application, deposited using Wire + Arc Additive Manufacturing (WAAM), was reported. Three different alloys, Haynes 188, Inconel 718, and ...
  • Selection and performance of AM superalloys for high-speed flight environments 
    James, William S.; Ganguly, Supriyo; Pardal, Goncalo (Springer, 2022-09-01)
    In developing the Wire + Arc Additive Manufacturing (WAAM) process for the manufacture of components used in high-speed flight environments, a selection process for suitable alloys was devised. Using material properties ...
  • Selection of parameters in nanosecond pulsed wave laser micro-welding 
    Coroado, Julio; Ganguly, Supriyo; Suder, Wojciech; Williams, Stewart; Meco, Sonia; Pardal, Goncalo (Springer, 2021-05-31)
    The digital control of the latest nanosecond pulsed wave (PW) fibre lasers allows very high flexibility in controlling the application of the total energy to a workpiece, which brings several advantages to the joining ...
  • Selection of processing parameters in laser microwelding. Part 1: Continuous wave (CW) mode 
    Coroado, J.; Ganguly, Supriyo; Suder, Wojciech; Williams, Stewart; Martins Meco, Sonia; Pardal, Goncalo (Old City Publishing, 2020-07-01)
    A phenomenological model which specifies the penetration depth and width of the fusion zone in laser microjoining can be a very useful tool in achieving the required welding parameters for a desired application. In this ...
  • Tandem Metal Inert Gas process for high productivity Wire Arc Additive Manufacturing in stainless steel 
    Martina, Filomeno; Ding, Jialuo; Williams, Stewart W.; Caballero, Armando; Pardal, Goncalo; Quintino, Luísa (Elsevier, 2018-11-19)
    This study investigates the feasibility of achieving high deposition rate using wire + arc additive manufacturing in stainless steel to reduce lead time and cost of manufacturing. The pulse MIG welding technique with a ...
  • Thermal fluid dynamics of the effect of filler wire on deposition rate and bead formation intending plasma arc-based DED 
    Chen, Xin; Wang, Chong; Ding, Jialuo; Qu, Rongdong; Wang, Yipeng; Pardal, Goncalo; Williams, Stewart (Elsevier, 2023-10-22)
    The influence of filler wire configuration, such as size and geometry, on the deposition rate (DR) and bead formation, has been studied in wire arc-based directed energy deposition (WADED), but the fundamental physics ...
  • Wire + Arc Additive Manufacturing 
    Williams, Stewart W.; Martina, Filomeno; Addison, Adrian C.; Ding, Jialuo; Pardal, Goncalo; Colegrove, Paul A. (Maney (Taylor and Francis), 2016-02)
    Depositing large components (>10 kg) in titanium, aluminium, steel and other metals is possible using Wire + Arc Additive Manufacturing. This technology adopts arc welding tools and wire as feedstock for additive manufacturing ...