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.
Results
Showing 1 to 20 of 27 for “"welding parameters"”.
-
Investigating Wood Welding Parameters Using a Prototype Welding Machine
… using adhesives. A variation of vibration welding, wood welding uses pressure and friction to bond materials together. During welding, heat causes a softening in the wood, a naturally occurring composite material. This softening leads to fiber entanglement and a bond forms upon cooling. The …
-
Effects of Welding Parameters On Mechanical Properties of Aa7050 Fsw Joints
<p> Friction Stir Welding (FSW) is a solid state joining process invented in 1991 by The Welding Institute (TWI, Cambridge, UK). The performance of the resultant welded joint in high strength aluminum alloys sets FSW apart from traditional fusion welding. Rapid process development of FSW joints for …
-
The influence of welding parameters and parent plate metallurgical characteristics on solidification of austenitic stainless steel weld metals
… by tile (i) thermal stress induced during welding, (ii) parent plate chemical composition, (iii) the parent plate microstructural and deformation characteristics i.e. strain energy. 3. Rapidly cooled welds have lower ferrite content than welds produced with slower cooling rates. The …
-
Determination of residual stresses in HSLA-100 steel weldments as a function of welding parameters using x-ray diffraction
… to study the effects of various processing parameters on the residual stress state of HSLA-100 bead-on-plate weldments. Three groups of samples were provided to Virginia Tech by CDNSWC. The first (GPX) was a sample of unwelded, as-received base material; the second group (RS-) consisted of …
-
A Heat Transfer Modeling Study of Rail Thermite Welding
… investigation is concerned with the effect of welding conditions on the development of fatigue-critical weld defects in rail thermite welds. Finite Element Modeling (FEM) was used to analyze the heat transfer behavior during the thermite welding process. The results of the thermal analyses were …
-
The development of a low-cost welding simulator based on augmented reality
… current study presents an innovative approach to welding simulation by leveraging augmented reality (AR) technology, aiming to replicate the welding experience. The development of this simulator involves the fabrication of physical models, including a welding coupon and a welding torch, both …
-
Feasibility and optimization of dissimilar laser welding components
… 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 achieved …
-
Modeling Robotic Wire Arc Additive Manufacturing Process Using Machine Learning
… of WAAM-produced parts by adjusting the welding parameters (voltage, current, travel speed, feed speed, amplitude, and wavelength), potentially minimizing or eliminating the need for post-process machining. These modeled parameters will then be used to generate the toolpath to fill any …
-
Prediction and control of residual stresses and distortion in HY-130 thick pipe weldments
… techniques for computer simulation of the welding process, an experiment is designed and carried out in which seam and girth weld are produced on a high strength steel cylinder. Fabrication of the HY-130 cylinder, selection of welding parameters for the seam and girth welds, and the …
-
Online tool condition monitoring for ultrasonic metal welding via sensor fusion and machine learning
Ultrasonic metal welding (UMW) is an important manufacturing process used for joining multi-layer, thin and conductive metals. In UMW, tool wear significantly affects the weld quality and tool maintenance constitues a substantial part of production cost. Thus, tool condition monitoring (TCM) is …
-
Modelling of friction stir spot welding
Friction stir spot welding (FSSW) is a solid-state welding process which is especially useful for joining precipitation-hardened aluminium alloys that undergo adverse property changes during fusion welding. It also has potential as an effective method for solid-state joining of dissimilar alloys. …
-
Efeito da soldagem com dupla camada na microestrutura e dureza da zona termicamente afetada do aço 9%Ni
… Technique, which defines selection criteria for welding parameters for double layer from the microstructural results of HAZ of a welding by simple deposition. The aim of the technique is to find a combination of parameters that allows to obtain a fine grain and low hardness HAZ. Based on the …
-
Dissimilar Metal Friction Stir Welding of Aluminum to Magnesium Alloys
… aluminum (Al) to magnesium (Mg) by friction stir welding resulted in the intermetallic formation inside the stir zone under all conditions of welding. The presence of brittle and low toughness intermetallic phases results in low strength and ductility of the weld joint. The strength of 6063 Al and …
-
Optimisation of GMAW via the alternating shielding gas technique
… the alternating shielding gas technique in arc welding systems has been previously studied due to advantages such as greater penetration of the weld joint, refined microstructure of the fusion zone, reduced heat input, and increased travel speeds of the welding torch. Yet, relatively little work …
-
3D FE simulation of the welding process to optimise residual stress profiles in complex geometries
… of significant levels can develop at the welding stage. Tensile welding residual stresses can, in combination with operating stresses, lead structures to be prone to catastrophic premature failure. It is most desirable that residual stresses be predicted and optimized well in advance of …
-
Fusion welding of diboride-carbide ceramic composites
<p>"Plasma and pulsed plasma arc welding (PAW and PPAW) processes were used to fusion weld ZrB<sub>2</sub> containing 20 vol% ZrC. Varying welding parameters resulted in changes in weld pool shape and size, and the size of ZrB<sub>2</sub> grains within the fusion zone. For PAW processes that …
-
An investigation of nugget formation and simulation in resistance spot welding
Resistance spot welding is an important part of the automotive manufacturing industry. Today's automobiles typically contain five-thousand or more welds. Spot welding is attractive to the industry for its speed and relative simplicity, however, it is not without its disadvantages. Current spot …
-
Characterisation of metallurgical and mechanical properties of friction stir welded low alloy steels for marine applications
Friction stir welding of steel presents numerous advantages across many industrial sectors compared to conventional fusion welding techniques. However, the fundamental knowledge of the process on steel remains relatively limited, hence industrial uptake of friction stir welding is practically …
-
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 …
-
Control and qualification of titanium welds
… 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 the cooling …
Page 1 of 2