Author:Pityana, Sisa L; Rossouw, RDate:Oct 2008The aim of this work was to produce crack-free thin surface layers consisting of binary (Al-Ni, Al-Fe) and ternary (Al-Ni-Fe) intermetallic phases by means of a high power laser beam. The laser surface alloying was carried out by melting Fe ...Read more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Sacks, NDate:Mar 2010Laser alloying of aluminium AA1200 was performed with a 4.4kW Rofin Sinar Nd:YAG laser to improve the surface hardness. Alloying was carried out by depositing Ni, Ti and SiC powders of different weight ratios on the aluminum substrate. The ...Read more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Sacks, NDate:Nov 2010Laser alloying of aluminium AA1200 was performed with a 4.4kW Rofin Sinar Nd:YAG laser to improve the surface hardness. Alloying was carried out by depositing Ni, Ti and SiC powders of different weight ratios on the aluminium substrate. The ...Read more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Rampedi, DLDate:Jul 2008Aluminium is used in industry for various applications due to its low cost, light weight and excellent workability, but lacks wear resistance and hardness. Laser alloying is used to improve surface properties such as hardness and wear resistance ...Read more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Rampedi, DLDate:Oct 2008The objective of this study was to improve the surface hardness and wear resistance of Al AA1200 by laser alloying with mixed Ni and Ti powders. This presentation reports on the experimental methods, the results and conclusionRead more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Sacks, NDate:Jul 2010Aluminium is vastly used in industry due to its low cost, light weight and excellent workability, but lacks in wear resistance and hardness. Laser alloying is used to improve the surface properties such as hardness by modifying the composition ...Read more
Author:Arthur, Nana KKDate:Apr 2019The laser engineered net shaping (LENS) system was used for the laser based manufacturing of a test geometry used to assess the performance of additive manufacturing systems. This system was preferred over a selective laser melting (SLM) ...Read more
Author:Kazadi, P; Van Rooyen, Corney; Burger, HDate:Mar 2006Laser refurbishment capabilities were demonstrated and promising results were obtained for repair of distance sleeves, foot rolls, descaler cassette, idler rolls. Based on the cost projections and the results of the in-situ testing, components ...Read more
Author:Forbes, A; Schulze, C; Flamm, D; Dudley, Angela L; Duparre, MDate:Apr 2013We show how laser beam characterization may be done in real-time with digital holograms. We illustrate the power of the techniques by applying them to a variety of laser sources, from fibers to solid-state.Read more
Author:Forbes, ADate:Aug 2006Many analytical techniques exist to explore the propagation of certain laser beams in free space, or in a linearly absorbing medium. When the medium is nonlinearly absorbing the propagation must be described by an iterative process using the ...Read more
Author:Masina, Bathusile N; Bodkin, R; Mwakikunga, Bonex W; Forbes, ADate:Aug 2011This paper presents an implementation of a laser beam shaping system for both heating a diamond tool and measuring the resulting temperature optically. The influence the initial laser parameters have on the resultant temperature profiles is ...Read more
Author:Litvin, IA; Burger, L; De Gama, MP; Mathye, A; Forbes, ADate:Sep 2007Recent approaches to demonstrating adaptive optics and atmospheric turbulence have made use of spatial light modulators (SLMs) as the active phase element. However, there are limitations in using SLMs as an accurate method of simulating ...Read more
Author:Forbes, A; Lizotte, TEDate:Sep 2012Full content of the proceedings of the Laser Beam Shaping XIII conference held in San Diego, California, United States.Read more
Author:Bolokang, Amogelang S; Mathabathe, Maria NDate:Apr 2021The shroud shelve life of turbine blades depends on wear resistance. Thus, the wear of blade shroud shelves’ contact area ascertains the overall service life of gas turbine engines (GTE). Moreover, research shows that the life service of ...Read more
Author:Van Rooyen, Corney; Burger, H; Theron, MarithaDate:Jun 2009Laser cladding crack repair of austenitic stainless steel vessels subjected to internal water pressure was evaluated. The purpose of this investigation was to develop process parameters for in-situ repair of through-wall cracks in components ...Read more
Author:Kumar, S; Pityana, Sisa LDate:Mar 2010Modification of Aluminium surface by injecting, dispersing and melting TiB2 powder with the help of a laser beam promises to enhance tribological properties of Aluminium. The present work consists of making single lines and various overlapping ...Read more
Author:Lengopeng, T; Botes, A; Popoola, APIDate:Nov 2014This paper evaluates the effect of process parameters (laser power and scanning velocity) on clad layer height, heat affected zone (HAZ) width, metallurgical bonding to base metal and Vickers microhardness profiles of clad layers of various ...Read more
Author:Phume, L; Pityana, Sisa L; Meacock, C; Popoola, APIDate:Dec 2012The objectives of this study were to investigate laser surface coating of Ti6Al4V with preplaced Hafnium powder, and to determine the influence of the energy density on the characteristics of bonding and the microstructure.Read more