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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 74 for “"Heat Input"”.
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The response of two-phase hydrothermal systems to changing magmatic heat input at mid-ocean ridges
… are largely influenced by changing magmatic heat input. I use the FISHES code to investigate the evolution of surface temperature and salinity as a function of time-varying heat flux at the base of a two-phase, vapor-brine hydrothermal system. I consider a two-dimensional rectangular box that …
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Effects of heat input and dilution on the microstructure and properties of microalloyed steel weld metal, The
Includes bibliographical references.
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Non-intrusive two-phase flow regime identification and transport characterization in microchannels subject to uniform and non-uniform heat input
<p>Direct integration of compact microchannel heat sinks is an attractive thermal management solution for the dissipation of high heat fluxes, specifically under boiling conditions that provide high rates of heat transfer at a uniform heat sink temperature. Under two-phase flow conditions, the heat …
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A study on the effect of increased heat input on residual stress, microstructure evolution and mechanical properties in Ti6Al4V selective laser melting
… and the Aeroswift machine is the amount of heat input used to make components based on the laser powers. Heat input is the ratio of the laser power to the scanning speed and it plays a role in the thermal history of a built part, its thermal gradients and therefore its residual stress. Heat …
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A Torque Based Power Input Model for Friction Stir Welding
… for predicting the size of the weld nugget and heat affected zones in fusion welded structures. The basis for these models is the welding heat input, which is fairly well understood for most arc welding processes. However, this traditional approach is not as straightforward for Friction Stir …
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Experimental and Numerical Investigation of Tool Heating During Friction Stir Welding
The heat input to the tool has been investigated for friction stir welding (FSW) of aluminum alloy AL 7075-T7351 over a wide range of process operating parameters using a combined experimental/numerical approach. In a statistical Design of Experiments fashion, 54 experimental welds (bead-on-plate) …
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Modeling of Residual Stress in Thick Section Weldments
… physical phenomena observed during welding.Ramp heat input functions and lumped weld passes were employed for finite element analysis. Ramp heat input functions were used to simulate the actual heat input of the moving arc and improve the numerical convergence of the thermal model. A lumped pass …
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The influence of welding parameters and parent plate metallurgical characteristics on solidification of austenitic stainless steel weld metals
The present work reports the effect of heat input, cooling rate, parent plate deformation and restraining conditions on the formation and morphology of delta ferrite in welds on AISI 318L and 321 steels. The experiments were carried out on commercially produced plates in the following conditions: …
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Evaluation of the Performances of Electrically Heated Clothing
… these problems, a slim garment with a built-in heating element could be useful. The heat input power and heating efficiency are the two most important parameters for a piece of heated clothing. The input power determines how much heat can be released from the whole clothing system, while the …
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Process-Microstructure-Property Relationships of High-Pressure Cold Spray Deposition of Aa7050 After in Situ Laser Heat Treatment
… cold sprayed AA7050 after in situ laser heat treatment. Successfully cold sprayed aluminum alloys with a low porosity promotes the idea to apply the cold spray technique from dimensional restoration to load-bearing structural repair. Recent literature shows that heat treatment of cold …
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Optimisation of GMAW via the alternating shielding gas technique
… microstructure of the fusion zone, reduced heat input, and increased travel speeds of the welding torch. Yet, relatively little work has been carried out utilising this novel method. For instance, shielding gases employed during the arc welding procedures have been limited to Ar, CO and He, …
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Three-dimensional transient thermo-elasto-plastic modeling of gas metal arc welding using the finite element method
… a three-dimensional finite element transient heat transfer model has been developed for the autogenous Gas Tungsten Arc Welding (GTAW) process which does not require the complicated metal transfer modeling. A mathematical model to calculate arc heat input when the welding torch is inclined at …
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Dual-temperature Kalina cycle for geothermal-solar hybrid power systems
… of a power system coupling two renewable heat sources: low-temperature geothermal and a high-temperature solar. The process, referred to as a dual-temperature geothermal-solar Kalina hybrid cycle, is analyzed in detail and then compared to appropriate single-heat source power systems, in …
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Control and qualification of titanium welds
… geometry (penetration depth and weld width) and heat input. A welding spectrum for titanium and its alloys of different thicknesses was obtained. Back shielding gas was beneficial in obtaining good welds. Both heat input rate and cooling rate were found to affect the grain size of the weld, with …
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Microstructural and property assessment of creep aged 12cr steel after welding
… prepared and characterised. Furthermore, the heat input was simulated in additional samples using Gleeble thermomechanical equipment.
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Effects of cold metal transfer welding on properties of ferritic stainless steel
… is welded as a result of grain coarsening in the heat affected zone. Welding equipment manufacturers are constantly incorporating new technologies and capabilities into welding equipment, to make welding easier and create better welds, which then gives that manufacturer a competitive advantage. …
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Manipulation of Heat Dissipation from Sides of Electrolytic Cells
… However operating the cells with higher heat input (or out of the cell’s thermal operating window) at one stage is encountered in many smelters. Hence, various cell design modifications are required to cope with such extra heat input to maintain cell thermal balance The objective of this …
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Avaliação da influência do hidrogênio na tenacidade à fratura de juntas soldadas do aço inoxidável superduplex UNS S32750 com diferentes aportes térmicos
… toughness of welded joints, with two different heat input 1.1 kJ/mm and 2.0 kJ/mm, of one superduplex stainless steel (UNS S32750) in presence of hydrogen. The unloading compliance tests (according ASTM E1820 standard) were performed in the air and after different times of hydrogenation (15, 30 …
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Experimental Investigation and Validation of Boiling and Condensation Thermal Resistances in Cylindrical Thermosyphons and Screen-Wick Heat Pipes.
Thermosyphons (TS) and heat pipes (HP) are passive two-phase thermal transport devices capable of transferring high heat loads with small temperature differences in thermal management applications. This thesis aims to improve the design-stage prediction of TS and HP performance, where device …
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Thermoelectric cooling devices: thermodynamic modelling and their application in adsorption cooling cycles
… verified with theoretical modelling. Infra-red heaters with a tapered kaleidoscope emulate uniform heat input (similar to CPUs) at the evaporator. A pool boiling investigation at low heat flux and vacuum pressure is also presented and a modified Rohsenow correlation is proposed.
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