The original Pons/Fleischmann experiment was deeply flawed, and it seems the same errors are reproduced in followup experiments these past 30 or so years. The Pons/Fleischmann apparatus was not properly purged of He before the experiment. An independent examination of their electrodes, ‘Measuring helium in electrolyzed palladium’ precisely quantified the presence of He in the P/F electrodes, but one lab noted that this looked like the palladium contained He from a manufacturing process. Precious metals are typically processed with an induction furnace and an inert atmosphere of helium or argon.
“Induction furnaces are widely used throughout metallurgy not just because of their efficient melting abilities, but also because of their usefulness in forging new alloys. Because induction is a no-contact process that doesn’t utilize combustion, induction furnaces can work in inert atmospheres and vacuums – which is necessary when creating alloys that oxidize if heated in the presence of air. As an additional benefit, the magnetic forces in an induction furnace can be directed to stir the molten metal, which is very useful for creating fully homogenized alloys.”
So, there really is no question of a nuclear fusion reaction without any validated reaction products. That the same errors are repeated over and over again by cold fusion proponents in search of a positive result suggests something pathological.