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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 26 for “"Weldability"”.
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Weldability and hot ductility of iron aluminides
Includes bibliographical references.
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Weldability and hydrogen relationships in super duplex stainless steel.
As the microstructure of commercial duplex stainless steels consists of approximately 50% austenite and 50% ferrite, the response of these two phases to hydrogen is of interest to the users of these materials. A study has been made of the hydrogen cracking behaviour in welded super duplex stainless …
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Investigation of Weldability in High-Cr Ni-base Filler Metals
… The second aim was to evaluate the weldability of a new heat of Inconel alloy 52MSS (ERNiCrFe-13) with reduced iron content as well as a single heat of Kobelco 690NB (ERNiCrFe-7A) comparing these materials with other available alloys of the same type.The incorporation of levitation …
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Capillarity effects in the gas tungsten arc weldability of 21-6-9 stainless steel
Includes bibliographical references.
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A Quantitative Study of the Weldability of Inconel 718 Using Gleeble and Varestraint Test Methods
<p>Nickel super alloy Inconel 718 was tested and compared to Haynes 230 using Gleeble and Varestraint mechanical test methods. Hot cracking susceptibility was examined in either alloy using a sub-scale Varestraint test method at 5 augmented strain levels: 0.25%, 05.%, 1%, 2%, and 4%. Maximum crack …
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A study of Laser weldability of IN-738 Nickel-based Superalloy in a new pre-weld heat treatment condition
… in this master’s thesis was to study the laser weldability improvement of the alloy which had undergone the new heat treatment, FUMT and the results were compared to an existing pre-weld heat treatment, solution heat treatment (SHT). Also, thermomechanical fatigue (TMF) behavior of the welded …
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Elemental Effects of Fe, Mo, C, and Hf (or Nb) on Solidification Behavior, Microstructure, and Weldability of High-Cr, Ni-base Filler Metals
… the effects of Mo on the microstructure and weldability of Hf and Nb-bearing high-Cr, Ni-base alloys. Commercially available Nb-bearing Ni-Cr-Fe alloys like filler metal 52MSS have depended on the addition of 4 wt % Mo to improve the ductility-dip cracking resistance of the filler metal. …
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Thermomechanical factors influencing weld metal hydrogen assisted cold cracking
… and undertaken. Development of an Enhanced Weldability Test. To facilitate deposition of tests welds under high restraint in a range of heat inputs which reflected the desired test window, an enhanced weldability test, the MWIC, was designed and commissioned. The test’s geometry and …
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The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator
… very unsatisfactory and attempts to improve the weldability by modifying the characteristics of the control circuit are unsuccessful. Only by increasing the time constant of the output circuit through the addition of series inductance can the desired improvements be obtained. At this stage an …
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JOINING OF ULTRA-HIGH TEMPERATURE CERAMICS TO THE SAME AND REFRACTORY METALS VIA FUSION WELDING
… were investigated to determine their effect on weldability. Welds were formed between molybdenum, or a molybdenum alloy, and ceramic compositions on a binary join between nominally pure ZrB2 and the SiC-ZrB2-ZrC ternary eutectic composition. Neither thermal conductivity nor electrical …
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High strength steel for seismic resistance of beam-to-column connections: novel metal investigation
… of creating steels with greater strength, good weldability and reason¬able ductility. This thesis focuses on semi-rigid ---partial strength--- connections with components made from new bainitic steel, an alloy possessing greater ductility, strength and weldability due to its particular …
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Microstructural and property assessment of creep aged 12cr steel after welding
… widely used X20 steel and advising Eskom on the weldability limits of this steel. Real welds consisting of new and creep aged steel were prepared and characterised. Furthermore, the heat input was simulated in additional samples using Gleeble thermomechanical equipment.
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An investigation into the prediction of thermal and stress distributions set up during welding using finite-element analysis
… among the most important factors affecting the weldability of steels, producing distortion and cracking in weldments. This thesis examines the history and theory of the welding process, including the mathematical and finite-element theory of heat conduction. Using simple models, the …
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Bauschinger effect in Nb and V microalloyed line pipe steels
… towards decreasing carbon content, to increase weldability, with increased microalloying element content, to provide grain refinement, solid solution and precipitation strengthening. During the UOE forming of large diameter (more than 400 mm) welded pipes the strength drop from plate to pipe, as …
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The commercial viability of direct powder rolled titanium: A systematic review and market analysis
… available powders, as well as the fact that weldability has not been reliably demonstrated for powder metallurgy product made from these powders. The existing powder market was also found to be inadequately geared towards supporting a commercial enterprise due to the small size of the market …
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Development of LTTW consumables for the enhancement of mechanical properties and residual stress management in thin steel welded joints
… Its composition was tailored for electrode weldability optimization. Effects of the LTTW wire on weld microstructure, distortion, residual stresses distribution, and fatigue properties of the lap joint panels were studied in this research, and compared to the conventional ER70S-3 wire. In …
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Mechanical properties of laser welded semi-solid metal cast A356 alloy
… Nd: YAG laser has been used to investigate the weldability of SSM cast A356 alloy. The CSIR rheo-process was used to prepare the aluminium A356 SSM slurries and thereafter plates (4X80X100 mm3) were cast using a 50 Ton Edgewick HPDC machine. Plates in the as cast, T4 and T6 heat treatment …
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The design of a functionally graded composite for service in high temperature lead and lead-bismuth cooled nuclear reactors
… affected zone was observed, demonstrating field weldability. Finally, corrosion tests were performed on the fabricated FGC at 700°C after completely breaching the cladding in a small area to induce galvanic corrosion at the interface. None was observed. This FGC has significant impacts on LBE …
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Assessment of the corrosion behaviour of alloys 825 and 625 in stagnant seawater-effect of temperature and welding
… in offshore environments. Alloy 825 has good weldability and for applications that require exceptional resistance to corrosion, Inconel filler metal 625 is used as ''overmatching composition''. Nevertheless, there is always a threat of galvanic corrosion when two dissimilar alloys are …
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The development of abrasive-corrosive wear resistance of steels by microstructural control
… whilst maintaining adequate formability and weldability. Abrasion of a metal surface has been shown to accelerate the rate of corrosion. Three categories of corrosion behavior are defined. A model of the abrasive-corrosive wear process is proposed to account for the behavior. The model …
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