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3157 |
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Thursday, March 29, 2012, SuperC, Hall Ford 1:50 PM Weld Properties 2 |
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Effects of electronic discharged machined and saw cut surfaces on electron beam welding of a nitrogen-strengthened stainless steel and vanadium |
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Doug Kautz / Los Alamos National Laboratory (LANL), USA Patrick W. Hochanadel / Los Alamos National Laboratory, USA Carl E. Cross*/ Los Alamos National Laboratory, USA Paul Burgardt/ Los Alamos National Laboratory, USA Andrew N. Duffield/ Los Alamos National Laboratory, USA |
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A study of the surface contaminants and profiles resulting from electronic discharge machining (EDM) of a nitrogen-strengthened stainless steel and vanadium was conducted. The results showed that the material at the surface after EDM machining was not the pure base material. The study showed that small, but detectable, quantities of several elements were left on the surfaces after EDM machining. For most typical use applications, these surface impurities cause no problems but, two cases have been noted where this is not applicable: 1) For surfaces that are to be welded and 2) For materials that exhibit sensitivity to embrittlement or corrosion from interstitial contaminants. Electron beam welding tests were made on surfaces that were processed by electronic discharge machining and studied their metallurgical and mechanical characteristics. The choice of electron beam welding was driven by the small fusion zone associated with these welds. This small fusion zone results in large contamination potential with respect to the volume of melted material. Results will be presented from these studies. |