naa a22 4500 510771963 CHVBK 20180411083217.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11837-013-0592-5 doi (NATIONALLICENCE)springer-10.1007/s11837-013-0592-5 Causal Factors of Weld Porosity in Gas Tungsten Arc Welding of Powder-Metallurgy-Produced Titanium Alloys [Elektronische Daten] [T. Muth, Y. Yamamoto, D. Frederick, C. Contescu, W. Chen, Y. Lim, W. Peter, Z. Feng] An investigation was undertaken using gas tungsten arc (GTA) welding on consolidated powder metallurgy (PM) titanium (Ti) plate to identify the causal factors behind observed porosity in fusion welding. Tramp element compounds of sodium and magnesium, residual from the metallothermic reduction of titanium chloride used to produce the titanium, were remnant in the starting powder and were identified as gas-forming species. PM-titanium made from revert scrap, where sodium and magnesium were absent, showed fusion weld porosity, although to a lesser degree. We show that porosity was attributable to hydrogen from adsorbed water on the surface of the powders prior to consolidation. The removal and minimization of both adsorbed water on the surface of titanium powder and the residues from the reduction process prior to consolidation of titanium powders are critical for achieving equivalent fusion welding success similar to that seen in wrought titanium produced via the Kroll process. TMS (outside the USA), 2013 Muth T. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Yamamoto Y. Alloy Behavior and Design Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Frederick D. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Contescu C. Carbon and Composites Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Chen W. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Lim Y. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Peter W. Material Science and Technology Division, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut Feng Z. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut JOM Springer US; http://www.springer-ny.com 65/5(2013-05-01), 643-651 1047-4838 65:5<643 2013 65 11837 https://doi.org/10.1007/s11837-013-0592-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0592-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Muth T. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Yamamoto Y. Alloy Behavior and Design Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Frederick D. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Contescu C. Carbon and Composites Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Chen W. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Lim Y. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Peter W. Material Science and Technology Division, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Feng Z. Materials Processing and Joining Group, Oak Ridge National Laboratory, One Bethel Road, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/5(2013-05-01), 643-651 1047-4838 65:5<643 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer