Browsing by Author "Yapp, David"

Browsing by Author "Yapp, David"

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  • 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 ...
  • 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 ...
  • 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. ...
  • 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) ...
  • 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 ...
  • 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 ...
  • Assuncao, Eurico D.; 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. ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Quintino, L.; 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. ...