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Description
This report presents the effects and analysis of the effects of Pulsed-Gas Metal Arc Welding's (P-GMAW) on Lean Duplex stainless steel. Although the welding of Duplex and Super Duplex Stainless steels have been well documented in both the laboratory and construction industry, the use of Lean Duplex has not. The purpose for conducting this research is to ensure that the correct Ferrite-Austenite phase balance along with the correct welding procedures are used in the creation of reactor cores for new construction nuclear power generation stations. In this project the effects of Lincoln Electrics ER-2209 GMAW wire are studied. Suggestions and improvements to the welding process are then proposed in order to increase the weldability, strength, gas selection, and ferrite count. The weldability will be measured using X-Ray photography in order to determine if any inclusions, lack of fusion, or voids are found post welding, along with welder feedback. The ferritic point count method in accordance with ASTM A562-08, is employed so that the amount of ferrite and austenite can be calculated in the same manor that is currently being used in industry. These will then be correlated to the tensile strength and impact toughness in the heat-affected zone (HAZ) of the weld based on the ASTM A923 testing method.
ContributorsCarter, Roger (Author) / Rogers, Bradley (Thesis advisor) / Gintz, Jerry (Committee member) / Georgeou, Trian (Committee member) / Arizona State University (Publisher)
Created2012
Description
Ophthalmoscopes are integral to diagnosing various eye conditions; however, they often come at a hefty cost and are not generally portable, limiting access. With the increase in the prevalence of smart devices and improvements to their imaging capabilities, these devices have the potential to benefit areas where specialized imaging infrastructure is not well established. Smart device cameras alone cannot replace an ophthalmoscope. However, with the addition of lens and optics, it becomes possible to take diagnostic quality images. The goal is to design a modular system that acts as an adapter to a smart device enabling any user to take retinal images and corneal images with little to no previous experience. The device should be cost-effective, reliable, and easy to use. The device is not meant to replace conventional funduscopes but acts in areas where current units fail. Applications in non-optimal settings, low resource areas, or areas that currently receive suboptimal care due to geographic or socioeconomic barriers are examples where this device could be used. The introduction of screening programs run by nonspecialized medical personnel with devices that can capture and transmit quality eye images minimizes the long-term complications of degenerative eye conditions.
ContributorsSpyres, Dean (Author) / McDaniel, Troy (Thesis advisor) / Patel, Dave (Committee member) / Gintz, Jerry (Committee member) / Arizona State University (Publisher)
Created2022