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Improving Laser Beam Welding Efficiency
Antti Salminen, Mikhail Sokolov
Laser beam welding is becoming widely used in many industrial applications. This paper reviews recent research conducted on the performance, potential and problems of thick section butt joint laser welding. Common defects that occur in laser beam welding with high power laser welding are discussed and possible solutions proposed. Methods of welding process efficiency improvement are analyzed.
Acta Crystallographica Section C Crystal Structure Communications
Structures of dipeptides trityl-glycyl-L-phenylalanine benzyl ester and tert-butyloxycarbonyl-L-phenylalanyl-S-ethyl-L-cysteine dimethylamide
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Materials Science Forum
Effect of Post Weld Heat Treatment on Microstructure and Mechanical Properties of Welded 2205 Duplex Stainless Steel
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Title: Prospects of laser welding technology in the automotive industry: A review
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Hybrid Laser-Arc Welding of Thick-Walled, Closed, Circumferential Pipe Welds
Nasim Bakir
The application of hybrid laser-arc welding (HLAW) for joining closed circumferential welds is a challenge due to the high risk of forming a defective overlap area with a shrinkage void or solidification cracks in the material thickness. A series of HLAW experiments were performed to understand the development of a faulty overlap area when closing the circumferential weld. Welding trials on flat specimens and pipe segments were supported by numerical analyses in which the thermomechanical behavior of the welds in the overlap area was investigated. Different process control strategies were tested, including variations in defocusing levels and the overlap length. The newly developed HLAW head, including laser optics with a motor-driven collimation system, made it possible to defocus the laser beam during welding without disturbing the stability of the welding process. High-level defocusing of the laser beam of more than 40 mm relative to the specimen surface with a resulting beam diam...
Narrow Gap Laser Welding of 316L Stainless Steel for Potential Application in the Manufacture of Thick Section Nuclear Components
2013 •
ahmed elmesalamy
Thick-section austenitic stainless steels have widespread industrial applications, especially in nuclear power plants. The joining methods used in the nuclear industry are primarily based on arc welding processes. However, it has recently been shown that the Narrow Gap Laser Welding (NGLW) technique can be used to join materials with thicknesses that are well beyond the capabilities of single pass autogenous laser welding. The heat input for NGLW is much lower than that of arc welding, as are the expected levels of residual stress and distortion.The multi-pass laser welding technique, based on the narrow gap approach, is an emerging welding technology which can be applied to thick-section welds using a relatively low-power laser, but the process is more complicated than autogenous laser welding, since it is necessary to introduce filler wire to narrow gap weld configurations. Despite this complexity, the technique is very promising for improving the penetration capabilities of the l...
Laser welding with high power laser: The effect of joint configuration
Antti Salminen, Mikhail Sokolov
The use of high power lasers with wavelength around 1000 nm is growing fast. These lasers are compensating the conventional CO2 lasers in various new applications due to the fact that beam transfer with optical fiber provides various beneficial features to actual welding process and machinery used. These lasers are still not through studied in respect of their behavior in various cases of different joint configurations possible for keyhole welding. Occasionally the power density can be too high for welding of specific case. This study concentrates on behavior of keyhole process and effect of this to weld quality and properties in various joints and penetrations. The tests were carried out with stainless steels and S355 structural steel in case of bead on plate, butt joint and fillet joint welding. The quality of weld in various cases changed according to joint preparation and welding parameters. It was possible to reach acceptable quality in all cases. The quality and process perfor...
Reviews on Advanced Materials Science
Overview of the exploration status of laser-arc hybrid welding processes
Paul Kah
Metal industries producing thick sections have shown increasing interest in laser-arc hybrid welding processes because of their clear advantages compared with the individual processes of autogenous laser welding and arc welding. One major benefit of laser-arc hybrid welding is that compared to autogenous laser, welding joints with larger gaps can be welded with acceptable quality. The laser-arc hybrid welding process has good potential to extend the field of applications of laser technology, and provide significant improvements in weld quality and process efficiency in manufacturing applications. The objective of this review is to present a set-up for laser-arc hybrid welding processes and introduce a methodical comparison of the chosen parameters. The research describes the principles, means and applications of different types of laser-arc hybrid welding processes. Based on a review of the current knowledge base, important areas for further research are also identified. The study u...
Journal of Aerospace Technology and Management
Occurrence of defects in laser beam welded Al-Cu-Li sheets with t-joint configuration
2012 •
Milton Sergio Fernandes de Lima
