[Answer] Soldering 50-Down, e.g. crossword clue

• Soldering 50-Down, e.g. The more common lead-free systems have a higher melting point, . a 30 °C typical difference for tin-silver-copper alloys, but wave temperatures are approximately the same at ~255 °C; however at this temperature most typical lead free solders have longer wetting times than eutectic Pb/Sn 37:63 .Oxy-fuel welding (commonly called oxyacetylene welding, oxy welding, or gas welding in the U.S.) and oxy-fuel cutting are processes that use fuel gases (or liquid fuels such as gasoline) and oxygen to weld or cut metals. French engineers Edmond Fouché and Charles Picard became the first to develop oxygen-acetylene welding in 1903.Pure oxygen, instead of air, is used to increase the flame ...
  
  Electroless nickel plating (or EN plating) is a chemical process that deposits an even layer of nickel-phosphorus or nickel-boron alloy on the surface of a solid substrate, like metal or plastic. The process involves dipping the substrate in a water solution containing nickel salt and a suitable reducing agent.A polymer capacitor, or more accurately a polymer ...
  
  It is toxic in the production of capacitors and becomes unstable at the higher

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