Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Laser Welding"”.
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Feasibility and optimization of dissimilar laser welding components
… aim of this research is to predict and optimize laser welding of some economically important dissimilar materials in industry through applying a Taguchi orthogonal array design as a DOE approach to design the experiments, develop mathematical models and optimize the welding operation. This was …
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Study of polymeric materials for industrial applications in the field of laser welding
L'abstract è presente nell'allegato / the abstract is in the attachment
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Laser welding of metallic glass to crystalline metal in laser-foil-printing additive manufacturing
… additive manufacturing technology, i.e., laser-foil-printing, to make high-quality metallic glass parts with large dimensions and complex geometries and to fabricate multi-material components from metallic glass and crystalline metal. In this research, …
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Quenching and tempering effects on Rheo-cast F357 aluminium alloy during Nd: YAG laser welding
… to T4, T4+ or T6 heat treatments prior to laser welding. Welding of aluminium alloys poses many problems like porosity, loss of alloying elements, poor bead geometry and softening of the heat affected zone. Laser welding is however widely used in industrial production owing to the …
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Fatigue properties of dissimilar metal laser welded lap joints.
This work involves laser welding austenitic and duplex stainless steel to zinc-coated mild steel, more specifically 1.2mm V1437, which is a Volvo Truck Coiporation rephosphorised mild steel. The work investigates both tensile and lap shear properties of similar and dissimilar metal laser welded …
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Laser Shaping: A method for controlling the elastic behaviour of stretch fabrics for a targeted and graduated compressive effect on the body
This research was commissioned and funded by The Welding Institute (TWI). The Welding Institute are a global research and development facility specialising in the joining of materials for industrial applications. The purpose of this research was to develop capability in textiles joining, …
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Mitigated Motion-Induced Signal Loss and Enabled Refractive Index Measurement in Optical Coherence Tomography
… application of OCT is the monitoring of metallic welding conducted with high-power lasers, where OCT can detect weld depth in real-time. Despite this ability, OCT is known to lose signal when measuring moving objects. Since laser welding is volatile and prone to sporadic motion, it is hypothesized …
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Prediction and optimization of residual stresses, weld-bead profile and mechanical properties of laser welded components
Recently, laser welding has become a leading industrial joining process. Mainly because it has become highly automated using sophisticated robotic systems. However, to make effective use of automated laser welding it is essential to have a high degree of confidence in predicting the welding …
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Thermocapillary convection in laser melted pools during materials processing
… the complex heat transfer encountered during laser welding of metals. Melting and resolidification of the material occurs when the metal undergoes intense, non-uniform irradiation from a concentrated energy source, such a laser. Motion of the liquid metal in the molten region is induced by …
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Mechanical and metallurgical properties of dissimilar metal joints using novel joining techniques
… there have been significant new developments in welding processes for joining stainless steel and dissimilar metals. This is associated with the rise in interest of using stainless steel in the automotive industry from both car manufacturers and stainless steel producers. The main reason for …
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Laser foil printing and surface polishing processes
… technology for fabricating metal parts, called Laser Foil Printing (LFP), was proposed and developed in this dissertation. The manufacturing sub-processes comprising the LFP technology were comprehensively studied, which include the laser spot welding of foil, laser raster-scan welding of foil, …
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Laser weld pool optical diagnostics: Topography and visualization used for surface contour analysis and process monitoring
This experimental investigation into shallow laser welding describes new techniques for visualizing, measuring dimensions, and mapping the deformation of the weld pool free surface. The first known measurements of the molten surface contour have been obtained, analyzed, and compared with predicted …
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OPISA optoelectronics packaging interfaces for sub-micron alignment
… precision is required to optimally couple the laser source with the optical fibre. Laser welding is used because of its inherent attributes of accuracy, strength, cleanliness and minimised heat affected zone and structural changes. Due to the rapid solidification of the welded parts post …
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Thermoplastic bonding of microfluidic substrates
… is challenging. A survey of plastic welding techniques validates that contour transmission laser welding is the most viable and commercially demonstrated option for flexibility and sensitive microfluidic tolerances. However, understanding laser energy transmission and absorption …
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The properties of oxide-dispersed and spinodally strengthened copper alloys following high-temperature neutron environment exposure
… were found to be the most radiation resistant. Laser welding was found to be an ineffective method by which to join oxide dispersed copper alloys for nuclear applications. Spinodally strengthened alloys were found to exhibit improved properties following irradiation. Along with oxide dispersed …
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Design and manufacturing of novel hybrid metal-polymer heat exchangers
… to joining metal strips to polymer strips using laser welding, ultrasonic welding, or resistance seam welding, using adhesives to join the strips is easier for manufacturing and provides adequate joining strength. This work explores the improvement of a roll-to-roll setup to incorporate an …
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