Date of Award
Bachelor of Science (B.S.) in Mechanical Engineering and University Honors
Gas metal arc welding -- Electrodes -- Testing, Stainless steel -- Welding -- Testing, Surface hardening
The use of argon-hydrogen shielding gases is commonly used in practice to increase heat input and weld penetration for conventional gas metal arc welding (GMAW) of stainless steel. The effects of mixed argon and hydrogen gases on the electro-spark deposition (ESD) of 316L stainless steel onto 304 stainless steel was studied to determine if the same heat input and penetration benefits can be gained for ESD. Measurements were made to observe the effects of the gases mixtures on material transfer efficiency, deposition quality and the thermodynamics of the process. The compositions and microstructures of both single splat and multi-layered deposition cross-sections were analyzed using light optical metallography (LOM) and Scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS). The effects of argon-hydrogen shielding gas were measurable, but did not yield drastic differences in deposition quality as seen in GMAW processes.
Langston, Thomas, "The Influence of Hydrogen-Argon Mixed Gases on Electro-spark Deposition" (2016). University Honors Theses. Paper 284.