Browsing by Author "Yapp, David"

Browsing by Author "Yapp, David"

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  • Advances in Gas Metal Arc Welding and Application to Corrosion Resistant Alloy Pipes 
    da Costa Pépe, Nuno Vasco (Cranfield University, 2010-03)
    According to recent estimations, the construction of pipelines will continue to increase during the next thirty years, in particular as a result of oil and gas discoveries in remote locations. Significant advances in welding ...
  • Arc-based sensing in narrow groove pipe welding 
    Gil Teixeira Lopes, Agostinho (Cranfield University, 2006-08)
    Big gains in productivity are found in tandem and dual tandem pipeline welding but require highly skilled operators who have to control the position of the torch very accurately for long periods. This leads to high demands ...
  • Conduction mode: broadening the range of applications for laser welding 
    Assuncao, D. E.; Ganguly, Supriyo; Yapp, David; Williams, Stewart W. (2012-11-14)
    Conduction laser welding opens up a range of innovative applications for laser welding. This relatively novel mode of laser processing expands the application potential significantly beyond what is normally achieved today. ...
  • Effect of welding thermal cycles on the heat affected zone microstructure and toughness of multi-pass welded pipeline steels 
    Nuruddin, Ibrahim K. (Cranfield University, 2012-09)
    This research is aimed at understanding the effect of thermal cycles on the metallurgical and microstructural characteristics of the heat affected zone of a multi-pass pipeline weld. Continuous Cooling Transformation (CCT) ...
  • High-Speed GMAW and Laser GMAW Hybrid Welding of Steel Sheet 
    Harris , I. D. (Cranfield University, 2009-03)
    Arc welding is the most widely used set of joining technologies in industry today. The automotive tier supplier network and light manufacturing are significant users of arc welding, particularly gas metal arc welding ...
  • An Integrated Approach to the Determination and Consequences of Residual Stress on the Fatigue Performance of Welded Aircraft Structures. 
    Edwards, L.; Fitzpatrick, M. E.; Irving, Phil E.; Sinclair, I.; Zhang, X.; Yapp, David (2006-02-01)
    Although residual stress in welded structures and components has long been known to have an effect on their fatigue performance, access to reliable, spatially accurate residual stress field data has been limited. Recent ...
  • Interaction time and beam diameter effects on the conduction mode limit 
    Assunção, Eurico; Williams, Stewart W.; Yapp, David (Elsevier Science B.V., Amsterdam., 2012-06-30)
    Laser welding has two distinctive modes: keyhole and conduction mode. Keyhole mode is characterized by deep penetration and high welding speeds, while conduction mode has higher quality welds with no defects or spatter. ...
  • Investigation of conduction to keyhole mode transition 
    Goncalves Assuncao, Eurico (Cranfield University, 2012-07)
    There are two very distinct welding modes in laser welding, keyhole and conduction mode. The characteristics of keyhole laser welding; mainly high penetration, high productivity and high aspect ratio have led the industry ...
  • Measuring the process efficiency of controlled gas metal arc welding processes 
    Pepe, Nuno; Egerland, Stephan; Colegrove, Paul A.; Yapp, David; Leonhartsberger, Andreas; Scotti, Ameirico (2011-07-31)
    The thermal or process efficiency in gas metal arc welding (GMAW) is a crucial input to numerical models of the process and requires the use of an accurate welding calorimeter. In this paper, the authors compare a liquid ...
  • Mechanical characterisation and modelling of resistance welding 
    Van Rymenant, Patrick (Cranfield University, 2011-07)
    Resistance welding is used very extensively in industry for a wide range of applications. Knowledge and measurement of the dynamic characteristics of resistance welding equipment is important in the design of the equipment ...
  • Real time evaluation of weld quality in narrow groove pipe welding 
    Marmelo, Patricia C. (Cranfield University, 2012-10)
    With the growth in pipeline installations all over the world, there is a great demand for highly productive and robust welding systems. Mechanised pipe welding has been developed over the last 50 years and the present ...
  • Tandem gas metal arc pipeline welding 
    Liratzis, Theocharis (Cranfield University, 2007-04)
    Energy consumption has grown by 2% per year worldwide over the past ten years. In 2005 worldwide 900,000 barrels of oil and 7.6 billion cubic metre of natural gas were produced daily. The exploitation of fields to meet ...
  • Variable Polarity (AC) Arc Weld Brazing of Galvanized Sheet. 
    Joseph, Andy; Webb, Chris; Haramia, Mike; Yapp, David (2003-07-01)
    Requirements for improved durability in domestic consumer goods have invariably led to the application of more corrosion resistant materials. The basic material used by many industries, including automotive, ventilation ...
  • Variable polarity plasma arc welding of high strength aluminium alloys 
    Serrano, G. L. (Cranfield University, 2004-12)
    The VPP A W process has been evaluated and optimised for the joining of high strength aluminium alloys AA-2024 T351, AA-7150 W51 and AA-7150 T651. The initial experimentation was performed with conventional AC-GTAW ...
  • Welding with high power fiber lasers - A preliminary study. 
    Quintino, Luísa; Costa, A.; Miranda, R.; Yapp, David; Kumar, V.; Kong, C. J. (Elsevier Science B.V., Amsterdam., 2007-01-01)
    The new generation of high power fiber lasers presents several benefits for industrial purposes, namely high power with low beam divergence, flexible beam delivery, low maintenance costs, high efficiency and compact size. ...